Bloggfrslur mnaarins, jn 2010

Lpnan Haukadalsheii - Myndir...


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Um sustu helgi skrapp g upp Haukadalsheii og tk nokkrar myndir af Alaskalpnunni ar. Haukadalsheii er feina klmetra fyrir noran Geysi.


Lpnan er jurt sem margir hrfast af. Hn er me eindmum duglegur landnemi hrjstrugu landi og hentar vel til a gra upp rfoka mela eins og Haukadalsheii.

Haukadalsheii var ur fyrr gri land og jafnvel skgi vaxi eins og allnokkrar kolagrafir sem fundist hafa bera vitni um, svo og stku rofabr sem gnfa mannh upp r rfoka melunum. Allt etta land hefur n foki burt vegna ess a menn eyddu skginum og ofbeittu landi. Kld r Litlu saldarinnar svoklluu hafa sjlfsagt ri rslitum.

Fyrir nokkrum ratugum mtti sj grarlegt moldrok leggjast yfir uppsveitirnar norantt, en sem betur fer hefur a minnka mjg verulega, en a er fyrst og fremst a akka Lpnunni. Vissulega hefur melgresi einnig veri s, duglegir menn og konur hafa stungi niur au fu rofabr sem eftir eru, og flutt gamalt hey melana til a reyna a hefta sandfoki, en n Lpnunnar er ltil von til ess a sna megi vrn skn.

A koma Haukadalsheii mean lpnan er blma er mikil upplifun. Maur fyllist bjartsni og von. g man vel eftir v hvernig heiin leit t fyrir hlfri ld. vlkur munur :-)

Vissulega sj sumir rautt egar eir horfa yfir fagurblar lpnubreiurnar og fyllast hatri gagnvart essari einstku jurt. a ykir eim sem essar lnur ritar mjg undarlegt og finnur til me eim sem annig hugsa. Vissulega er hn geng og ekki heima alls staar. En illgresi er hn ekki. Hn er dugleg og eiginlega eina vopn okkar barttunni vi uppblsturinn. Vi verum a nota hana rtt og ekki dreifa hvar sem er.

Hva er a sem gerir Lpnuna svona einstaka? Lpnan er belgjurt eins og til dmis Baunagras og Hvtsmri. Hn hefur rtarhnisbakterur sem vinna nitur (kfnunarefni) r andrmsloftinu, og geta jafnvel losa um bundinn fosfr jarveginum. Bi essi efni eru burur fyrir Lpnuna og arar plntur sem vaxa sama sta. Lpnan hefur v eins og arar belgjurtir innbygga burarverksmiju rtarkerfinu. Rtur liggja djpt og sinumyndun er mikil, annig a undaraskmmum tma breytist frjsamur rfoka jarvegur frjsamt land.

Eftir allnokkra ratugi fer Lpnan san smtt og smtt a hrfa og annar grur sem ntur gs af frjsmum jarveginum kemur stainn. Einfaldasta ri til a flta essu ferli er hfileg beit. annig m nta jarblmi til a framleiaa gmstar ktilettur, egar a hefur unni sitt verk vi a gra upp landi. Ekki amaleg tilhugsun...

(Stkka m myndir me v a tvsmella r).

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Lpnan hefur unni kraftaverk Haukadalsheii.
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Smm saman vinnur blessu lpnan .
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Hr m glggt sj hve miki hefur foki burt. Rofabari er sjlfsagt rmlega mannh. Fyrst og fremst er etta afleiing ofbeitar.
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Hr stendur uppi eitt rofabar eins og minnismerki um forna frg.

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essi bleika Lpna skar sig r. Vildi vst vera ruvsi en hinar.

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Eru r ekki fallegar?
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Nei, essi mynd er ekki fr Tunglinu :-) Myndina tk skrsetjarinn fyrir hlfri ld Haukadalsheii, .e. ri 1960 egar hann vann vi a planta skgi ar rlti sunnar. var Haukadalsheiin eyimrk. N er hn a vakna til lfsins aftur. kk s Lpnunni og dugnai Tungnamanna.
a er erfitt a mynda sr a hr hafi land eitt sinn veri skgi vaxi.
Er virkilega einhver sem vill a landi lti svona t?


Kvi eftir Margrti Gujnsdttur Dalsmynni.

Alaskalpna er ndvegisjurt
sem tti a lofa og prsa
en umhverfisverndarmenn vilja hana burt
og vanknun mikilli lsa.

gerir hn rfoka eyisand
og urir a frjsmum reitum
undirbr vel okkar gta land
til taka hrjstugum sveitum.

Hn er lka gtur slenskur egn
me alveg magnaar rtur,
auninni er henni ekki um megn
a annast jarvegsins btur.

Mestallt sumar er grnt hennar glit
geti a valdi fri
a hn ber himinsins heibla lit
hlfan mnu ri.

Auvelt er a komast Haukadalsheii me v a aka sem lei liggur fr Geysi um skgrktargiringuna Haukadal. Eki er framhj kirkjunni og san norurtt um mjg fallegt skglendi. Skgurinn nr langleiina upp heiina.

Krkjur:

N kli land ttrum, eftir Hauk Ragnarsson

Vinir Lpnunnar Fsbk Umrur og krkjur nlegar greinar.

Vsindvefurinn (Sigmundur Gubjarnason): Hvaa lkningagildi hefur lpnan?


Sumarslstur & New Scientist: "What's wrong with the sun?"...

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"What's wrong with the sun?" nefnist hugaver grein njasta hefti New Scientist. a s tplega hgt a ra um a eitthva rangt s vi slina um essar mundir, er ljst a hegun hennar er venjuleg. annig hagar hn sr samt anna slagi, ef til vill einu sinni ld ea svo.

tilefni ess a dag eru sumarslstur er ekki r vegi a beina huganum a okkar fallegu stjrnu sem veitir okkur birtu og yl. Greinin hr fyrir nean er eftir Stuart Clark, en bk eftir hann kemur vi sgu bloggpistlinumflug slgos geta haft afdrifarkar afleiingar jru niri...

sunspot_1002266.gifAuvita eru engin bein tengsl milli sumarslstaa og essarar greinar, en greininni fjallar hfundurinn um stareynd a virkni slar hefur falli verulega undanfrnum mnuum, fr v a vera venju virk a a vera venju lt. Hn lenti venju langvarandi lg eftir slsveiflu nmer 23 og eitthva virist hn eiga erfitt me a byrja almennilega slsveiflu nmer 24. essi breyting sem kom flestum vsindamnnum vart er a sumu leyti krkomin v hn auveldar mnnum a last betri skilning tengslunum milli jarar og slar. Ekki er alveg vst a vi slendingar verum ngir me essa breytingu ef hn kemur til me a standa ratugi og hefur fr me sr klnandi veurfar eins og Stuart Clark minnist . a eftir a koma ljs... Myndin hr til hliar snir run slblettatlunnar undanfarin r ar til dag. Stkka m mynd til a sj betur.

Afrit af essar grein hafa birst va og er v vonandi htt a birta hana hr. Greinin er mjg aulesin og tlu almenningi. (Litbreytingar o.fl. eru bloggarans).

(Nenni einhver ekki a lesa allan textann, m alltaf skoa myndbndin Smile )

Gefum Dr. Stuart Clark stjarnelisfringi ori:

20100612.jpgSunspots come and go, but recently they have mostly gone. For centuries, astronomers have recorded when these dark blemishes on the solar surface emerge, only for them to fade away again after a few days, weeks or months. Thanks to their efforts, we know that sunspot numbers ebb and flow in cycles lasting about 11 years.

But for the past two years, the sunspots have mostly been missing. Their absence, the most prolonged for nearly a hundred years, has taken even seasoned sun watchers by surprise. "This is solar behaviour we haven't seen in living memory," says David Hathaway, a physicist at NASA's Marshall Space Flight Center in Huntsville, Alabama.

The sun is under scrutiny as never before thanks to an armada of space telescopes. The results they beam back are portraying our nearest star, and its influence on Earth, in a new light. Sunspots and other clues indicate that the sun's magnetic activity is diminishing, and that the sun may even be shrinking. Together the results hint that something profound is happening inside the sun. The big question is what?
The stakes have never been higher. Groups of sunspots forewarn of gigantic solar storms that can unleash a billion times more energy than an atomic bomb. Fears that these giant solar eruptions could create havoc on EarthMovie
 
Camera, and disputes over the sun's role in climate change, are adding urgency to these studies. When NASA and the European Space Agency launched the Solar and Heliospheric Observatory almost 15 years ago, "understanding the solar cycle was not one of its scientific objectives", says Bernhard Fleck, the mission's project scientist. "Now it is one of the key questions."
Myndband sem fylgir greininni New Scientist
Sun behaving badly

Sunspots are windows into the sun's magnetic soul. They form where giant loops of magnetism, generated deep inside the sun, well up and burst through the surface, leading to a localised drop in temperature which we see as a dark patch. Any changes in sunspot numbers reflect changes inside the sun. "During this transition, the sun is giving us a real glimpse into its interior," says Hathaway.

When sunspot numbers drop at the end of each 11-year cycle, solar storms die down and all becomes much calmer. This "solar minimum" doesn't last long. Within a year, the spots and storms begin to build towards a new crescendo, the next solar maximum.

What's special about this latest dip is that the sun is having trouble starting the next solar cycle. The sun began to calm down in late 2007, so no one expected many sunspots in 2008. But computer models predicted that when the spots did return, they would do so in force. Hathaway was reported as thinking the next solar cycle would be a ";;doozy";;: more sunspots, more solar storms and more energy blasted into space. Otherspredicted that it would be the most active solar cycle on record. The trouble was, no one told the sun.

The first sign that the prediction was wrong came when 2008 turned out to be even calmer than expected. That year, the sun was spot-free 73 per cent of the time, an extreme dip even for a solar minimum. Only the minimum of 1913 was more pronounced, with 85 per cent of that year clear.


As 2009 arrived, solar physicists looked for some action. They didn't get it. The sun continued to languish until mid-December, when the largest group of sunspots to emerge for several years appeared. Finally, a return to normal? Not really.

Even with the solar cycle finally under way again, the number of sunspots has so far been well below expectations. Something appears to have changed inside the sun, something the models did not predict. But what?

The flood of observations from space and ground-based telescopes suggests that the answer lies in the behaviour of two vast conveyor belts of gas that endlessly cycle material and magnetism through the sun's interior and out across the surface. On average it takes 40 years for the conveyor belts to complete a circuit.

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New Scientist
When Hathaway's team looked over the observations to find out where their models had gone wrong, they noticed that the conveyor-belt flows of gas across the sun's surface have been speeding up since 2004.

The circulation deep within the sun tells a different story. Rachel Howe and Frank Hill of the National Solar Observatory in Tucson, Arizona, have used observations of surface disturbances, caused by the solar equivalent of seismic waves, to infer what conditions are like within the sun. Analysing data from 2009, they found that while the surface flows had sped up, the internal ones had slowed to a crawl.

These findings have thrown our best computer models of the sun into disarray. "It is certainly challenging our theories," says Hathaway, "but that's kinda nice."

It is not just our understanding of the sun that stands to benefit from this work. The extent to which changes in the sun's activity can affect our climate is of paramount concern. It is also highly controversial. There are those who seek to prove that the solar variability is the major cause of climate change, an idea that would let humans and their greenhouse gases off the hook. Others are equally evangelical in their assertions that the sun plays only a minuscule role in climate change.

If this dispute could be resolved by an experiment, the obvious strategy would be to see what happens when you switch off one potential cause of climate change and leave the other alone. The extended collapse in solar activity these past two years may be precisely the right sort of test, in that it has significantly changed the amount of solar radiation bombarding our planet. "As a natural experiment, this is the very best thing to happen," says Joanna Haigh, a climatologist at Imperial College London. " Now we have to see how the Earth responds."

The climate link

Mike Lockwood at the University of Reading, UK, may already have identified one response - the unusually frigid European winter of 2009/10. He hasstudied records covering data stretching back to 1650, and found that severe European winters are much more likely during periods of low solar activity (New Scientist, 17 April, p 6). This fits an emerging picture of solar activity giving rise to a small change in the global climate overall, yet large regional effects.

Another example is the Maunder minimum, the period from 1645 to 1715 during which sunspots virtually disappeared and solar activity plummeted. If a similar spell of solar inactivity were to begin now and continue until 2100, it wouldmitigate any temperature rise through global warming by 0.3 C on average, according to calculations byGeorg Feulner and Stefan Rahmstorf of the Potsdam Institute for Climate Impact Research in Germany. However, something amplified the impact of the Maunder minimum on northern Europe, ushering in a period known as the Little Ice Age, when colder than average winters became more prevalent and the average temperature in Europe appeared to drop by between 1 and 2 C.

A corresponding boost appears to be associated with peaks in solar output. In 2008, Judith Lean of the Naval Research Laboratory in Washington DC published a study showing that high solar activity has a disproportionate warming influence on northern Europe (Geophysical Research Letters, vol 35, p L18701).

So why does solar activity have these effects? Modellers may already be onto the answer. Since 2003, spaceborne instruments have been measuring the intensity of the sun's output at various wavelengths and looking for correlations with solar activity. The results point to the sun's emissions of ultraviolet light. "The ultraviolet is varying much, much, much more than we expected," says Lockwood.

Ultraviolet light is strongly linked to solar activity: solar flares shine brightly in the ultraviolet, and it helps carry the explosive energy of the flares away into space. It could be particularly significant for the Earth's climate as ultraviolet light is absorbed by the ozone layer in the stratosphere, the region of atmosphere that sits directly above the weather-bearing troposphere.

More ultraviolet light reaching the stratosphere means more ozone is formed. And more ozone leads to the stratosphere absorbing more ultraviolet light. So in times of heightened solar activity, the stratosphere heats up and this influences the winds in that layer. "The heat input into the stratosphere is much more variable than we thought," says Lockwood.

Enhanced heating of the stratosphere could be behind the heightened effects felt by Europe of changes in solar activity. Back in 1996, Haigh showed that the temperature of the stratosphere influences the passage of the jet stream, the high-altitude river of air passing from west to east across Europe.

Lockwood's latest study shows that when solar activity is low, the jet stream becomes liable to break up into giant meanders that block warm westerly winds from reaching Europe, allowing Arctic winds from Siberia to dominate Europe's weather.

The lesson for climate research is clear. "There are so many weather stations in Europe that, if we are not careful, these solar effects could influence our global averages," says Lockwood. In other words, our understanding of global climate change could be skewed by not taking into account solar effects on European weather.

Just as one mystery begins to clear, another beckons. Since its launch 15 years ago, the SOHO spacecraft has watched two solar minimums, one complete solar cycle, and parts of two other cycles - the one that ended in 1996 and the one that is just stirring. For all that time its VIRGO instrument has been measuring the total solar irradiance (TSI), the energy emitted by the sun. Its measurements can be stitched together with results from earlier missions to provide a 30-year record of the sun's energy output. What this shows is that during the latest solar minimum, the sun's output was 0.015 per cent lower than during the previous lull. It might not sound like much, but it is a hugely significant result.

We used to think that the sun's output was unwavering. That view began to change following the launch in 1980 of NASA'sSolar Maximum Mission. Its observations show that the amount of energy the sun puts out varies by around 0.1 per cent over a period of days or weeks over a solar cycle.

Shrinking star

mg20627640_800-1_300.jpgDespite this variation, the TSI has dipped to the same level during the three previous solar minima. Not so during this recent elongated minimum. Although the observed drop is small, the fact that it has happened at all is unprecedented. "This is the first time we have measured a long-term trend in the total solar irradiance," says Claus Frhlich of theWorld Radiation Centre in Davos, Switzerland, and lead investigator for the VIRGO instrument.

If the sun's energy output is changing, then its temperature must be fluctuating too. While solar flares can heat up the gas at the surface, changes in the sun's core would have a more important influence on temperature, though calculations show it can take hundreds of thousands of years for the effects to percolate out to the surface. Whatever the mechanism, the cooler the surface, the less energy there is to "puff up" the sun. The upshot of any dip in the sun's output is that the sun should also be shrinking.

Observations suggest that it is - though we needn't fear a catastrophe like that depicted in the movie Sunshine just yet. Back in the 17th century French astronomer Jean Picard made his mark by measuring the sun's diameter. His observations were carried out during the Maunder minimum, and he obtained a result larger than modern measurements. Was this simply because of an error on Picard's part, or could the sun genuinely have shrunk since then? "There has been a lot of animated discussion, and the problem is not yet solved," says Grard Thuillier of the Pierre and Marie Curie University in Paris, France.

Observations with ground-based telescopes are not precise enough to resolve the question, due to the distorting effect of Earth's atmosphere. So the French space agency has designed a mission, aptly namedPicard, to return precise measurements of the sun's diameter and look for changes.

Frustratingly the launch, on a Russian Dnepr rocket, is mired in a political disagreement between Russia and neighbouring Kazakhstan. Until the dispute is resolved, the spacecraft must wait. Every day of delay means valuable data being missed as the sun takes steps, however faltering, into the next cycle of activity. "We need to launch now," says Thuillier.

What the sun will do next is beyond our ability to predict. Most astronomers think that the solar cycle will proceed, but at significantly depressed levels of activity similar to those last seen in the 19th century. However, there is also evidence that the sun is inexorably losing its ability to produce sunspots. By 2015, they could be gone altogether, plunging us into a new Maunder minimum - and perhaps a new Little Ice Age.

Of course, solar activity is just one natural source of climate variability. Volcanic eruptions are another, spewing gas and dust into the atmosphere. Nevertheless, it remains crucial to understand the precise changeability of the sun, and the way it influences the various regional patterns of weather on Earth. Climate scientists will then be able to correct for these effects, not just in interpreting modern measurements but also when attempting to reconstruct the climate stretching back centuries. It is only by doing so that we can reach an unassailable consensus about the sun's true level of influence on the Earth and its climate.

The sunspot forecast

Although sunspots are making a belated comeback after the protracted solar minimum, the signs are that all is not well. For decades, William Livingston at the National Solar Observatory in Tucson, Arizona, has been measuring the strength of the magnetic fields which puncture the sun's surface and cause the spots to develop. Last year, he and colleague Matt Penn pointed out that the average strength of sunspot magnetic fields has been sliding dramatically since 1995.

If the trend continues, in just five years the field will have slipped below the threshold magnetic field needed for sunspots to form.

How likely is this to happen? Mike Lockwood at the University of Reading, UK, has scoured historical data to look for similar periods of solar inactivity, which show up as increases in the occurrence of certain isotopes in ice cores and tree rings. He found 24 such instances in the last few thousand years. On two of those occasions, sunspots all but disappeared for decades. Lockwood puts the chance of this happening now at just 8 per cent.

Only on one occasion did the sunspot number bounce back to record levels. In the majority of cases, the sun continued producing spots albeit at significantly depressed levels. It seems that the sunspot bonanza of last century is over.

Stuart Clark's latest book is The Sun Kings (Princeton). He blogs at stuartclark.com

rklippa r mynd National Geographic Storm Worlds - Cosmic Fire. Sj hr.

Sj nnar vefsu Stuart Clark. ar eru athyglisverar videklippur r tti
National Geographic um slgos. www.stuartclark.com



Pistill fr janar 2009:
flug slgos geta haft afdrifarkar afleiingar jru niri...


Njar myndir af endursmi DC4 Skymaster Loftleia...



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aprl 2008 birtist hr pistill um trlega smi Birgis Sigurssonar risastru lkani af DC4 Skymaster flugvl Loftleia. Pistillinn er birtur aftur heild sinni hr fyrir nean, en fyrst eru nokkrar splunkunjar myndir af gripnum sem er til snis essa dagana 2. h Brimborgar Bldshfa 6-8.

g heimstti Birgi kunningja minn vinnusta hans Brimborg og tk nokkrar myndir. v miur gleymdi g flassinu ga heima og la myndirnar aeins fyrir a. Smelli samt risvar myndirnar til a sj strri.

a verur gaman a sj essa flugvl fljga eftir fein r.

Sj frtt og myndir af flugvlinni vefsu Brimborgar. ar er g lsing essu einstaka verkefni Birgis Sigurssonar. Verkefni sem taka mun sundir vinnustunda.

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Flugvlin er engin smsmi. Birgir Sigursson er vinstra megin.

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Nefhjl.

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sgeir Long smai hjlastellin nnast nkvmlega eftir fyrirmyndinni.
a tk um 900 klukkustundir. Hjlin eru uppdraganleg me glussakerfi alveg eins og fyrirmyndinni, enda verur vkvakerfi um bor me dlum, ventlum og llu sem v tilheyrir.

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Fjldinn allur af rafmtorum verur um bor til a hreyfa strifletina og stjrna hreyflunum. Hr m sj rlti snishorn.

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Pistillinn fr mars 2009:

Sunnudagur, 29. mars 2009.

trlegt: Douglas DC4 Skymaster Loftleia endursmaur slandi...!

Sumir ba yfir meiri vilja en mebrur eirra og ora a takast vi trleg verkefni frtma snum. Eiginlega verur maur agndofa egar maur sr hva Birgir Sigursson hefur frst fang blskrnum heima hj sr samt vini snum Jni V. Pturssyni. Birgir er a sma risastra eftirlkingu af fyrstu tlunarflugvl Loftleia sem flaug sitt fyrsta tlunarflug 26. gst 1948. Reyndar segir Jn a smavinnan s alfari unnin af Birgi sem eigi fa sna lka dugnai og rni. Hann er ekki a sma mdel til a hafa til snis uppi hillu, heldur flugvl sem er svo str a hn kemst varla fyrir blskrnum. Flugvl sem eftir a fljga um loftin bl!

Verkefni hfst ri 2003, en byrjai Birgir a teikna smateikningar eftir ltilli mlsettri mynd af fyrirmyndinni sem hann fann tmariti. a urfti a teikna hvern einasta hlut rttum mlikvara, en til ess urfti a byrja a teikna tal snimyndir af skrokknum og vngjum. Drjgur tmi fr ennan undirbning. Ekki er fjarri lagi a Birgir hafi nota nnast hvert kvld og hverja helgi vi smar undanfarin 5-6 r. sundir klukkustunda eru a baki og sjlfsagt sund eftir.

Hjlastelli er nnast kafli t af fyrir sig. sundjalasmiurinn sgeir Long heiurinn af smi ess og ar hafa nokkur hundru klukkustundir veri notaar vi nkvmnissm. Hjlastelli er nkvm eftirmynd af fyrirmyndinni. Hjlin vera a sjlfsgu uppdraganleg og til ess vea notair glussatjakkar, en um bor flugvlinni verur vlbnaur til a halda uppi olurstingi.

Flugvlin verur vntanlega knin me fjrum bensnhreyflum. Lkleg str er 30cc.

Til a stjrna strifltum vngjum, harstri, hliarstri, o.fl. vera um 18 rafmagnsmtorar, svokllu serv. .e. 4 stk. vngjum, 3 stk. stli, 4 stk. vi bensngjf mtora, 3 stk. fyrir uppdraganleg hjlastell, 3 stk. fyrir hjlalgur og 1 stk. fyrir stranlegt nefhjl.

venjulegri fjarstrri flugvl er sjaldnast meira en eitt vitki til a taka mti merkjum fr fjarstringu flugmannsins. essari vera eir lklega rr, meal annars til a tryggja ryggi.

Brlega verur hafist handa vi a kla mdeli me unnum lpltum og mla. mun a lta t nnast eins og fyrirmyndin, m.a verur hver hnonagli klningunni snilegur.

Hr fyrir nean eru nokkrar myndir af gripnum sem teknar voru nlega. Sumar eirra m stkka me v a rsmella r.

Hr sst inn blskrinn hans Birgis.

Vnghaf flugvlarinnar er 4,6 metrar, lengdin 3,6 metrar og fullsmu mun hn vntanlega vega um 50 kg. Strarhlutfllin eru 1:8.

Hr sst flugvlin fr hli. Rtt m greina Birgi bak vi gripinn.

Hgt er a taka vlina sundur til a auvelda flutning.


S aftur eftir flugvlinni innanverri.

Jn V. Ptursson drjgan tt sminni.

Hjlastelli eins og a leit t ri 2007.

Hvernig mun DC4 Skymasterinn lta t fullsmaur? Myndin hr fyrir nean gefur sm hugmynd um a. etta er DC3, litli brir DC4, .e. hin frga tveggja hreyfla flugvl Loftleia Jkull sem Skjldur Sigursson smai. Hr er veri a ba hana undir fyrsta flug Tungubkkum.

DC3 
Jkull

Jkull, DC3 flugvl flugleia.
Vlahlfarnar voru teknar af mean veri var a stilla hreyflana.

Svona mun Skymasterinn hans Birgis Sigurssonar vntanlega lta t flugi.

Vsir, 26. gst. 2008 16:15

tlunarflug til Bandarkjanna 60 ra

Douglas DC-4 Skymaster Mynd:flugsafn.is

dag eru 60 r san reglulegt tlunarflug vegum Icelandair hfst milli slands og Bandarkjanna. Fyrsta flugi var fari 26. gst 1948. a var vegum Loftleia Icelandic, eins af forverum Icelandair og var flogi Geysi, hinni sgufrgu Skymaster vl flagsins, til New York.


ur hafi veri flogi stopult milli slands og Bandarkjanna en fyrir rttum sextu rum fengu Loftleiir leyfi til tlunarflugs milli landanna og hfu a strax.

Koma slendinga til New York vakti mikla athygli snum tma. Helstu dagbl vestra greindu fr viburinum. Til gamans m geta ess a Steingrmur Hermannsson, fyrrverandi forstisrherra, var meal farega um bor, ungur nmsmaur.

tilefni dagsins verur faregum flugi Icelandair til vesturheims dag, .e. til New York, Boston, Toronto og Minneapolis, bonar lttar veitingar.

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Flugsning

Frst hefur a tilefni ess a Flugmdelflagi ytur er 40 ra um essar mundir muni vera boi upp afmlisflugsningu flugvellinum Tungubkkum Mosfellsb laugardaginn 10. jl. (11. jl til vara ef veri verur hagsttt laugardeginum).

Vntanlega vera ar til snis flugvlar af llum gerum, og flestum flogi. Auvita mest flugvlar sem ekki sjst daglega flugi hr landi, t.d. flugvlar fr fyrri heimsstyrjldinni.

Hr fyrir nean m sj nokkrar eirra flugvla sem munu fljga flugsningunni. Allar eru teknar Tungubkkum. Nest er njasta einkaota Sverris Gunnlaugssonar aflugi a Tungubkkum. a er ekki hverjum degi sem maur sr rekjur og tvekjur 33% mlikvara, ea ntsku herotur me alvru otu-trbnum sem snast 100.000 snninga mntu og ganga auvita fyrir ekta otueldsneyti. annig verur a Tungubkkum. ...Og meira til!

Myndunum var nappa hr.

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Alveg makalaust: Tnn dregin t me eldflaug... :-)

mislegt dettur mnnum hug LoL


slandi tkast ekki a skjta upp eldflaugum jhtardaginn, hva nota r vi tanntdrtt, en er etta eitthva sem tannlknar geta notfrt sr? Ea bara vi?
Frown



Er hnatthlnunin gurlega bara hjm eitt...?

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Hve mikil er hkkun hitastigs fr sustu rum Litlu saldarinnar?

Mealhiti jarar er um 15 grur. Svipa og dmigerur sumardagur slandi. Hitamlirinn merkilegi hr fyrir nean gti veri a sna hkkun hitastigs lofthjps jarar fr 1860 til dagsins dag. Svari vi spuringunni m finna me v a lesa af essum sannkallaa tframli.

Er essi hkkun mikil ea ltil? a fer eftir v hvernig mli er liti. Um a deila menn endalaust og hitnar oft hressilega hamsi. Hlnunin kann a virast ltil samanburi vi sumt, en mikil mia vi anna. Er hlnunin bara hjm eitt? annig er spurt fyrirsgn pistilsins. v kann bloggarinn ekki svar vi. Ltum svari v liggja milli hluta. a er svo anna ml, a hr landi hefur hkkun hitastigs, ltil s, haft mjg jkv hrif grurfar. a er umdeilt.

Hvernig stendur essari breytingu hitastigi, .e. um 0,8 grur 150 rum?

Ekki veit bloggarinn a. Helmingur hkkunarinnar gti stafa af vldum nttrulegra breytinga og helmingur vegna losunar manna koltvsringi. Hugtaki "helmingur" er hr mjg loi og gti tt nnast hva sem er. Ltum a svar ngja.


Taki eftir v a mlirinn hr fyrir nean snir mist mealhita dagsins dag og mealhitann fyrir 150 rum. etta er neitanlega merkilegur mlir sem snir okkur hve mikil essi breyting er mia vi eitthva sem vi skiljum betur er einhverjar torskiljanlegar krfur og ferla...

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Hkkun lofthita jarar undanfarin 150 r er um 0,7 til 0,8 grur.

Mealhiti lofthjpsins er um 15 grur.

Hreyfimyndin snir essa breytingu sastliinna 150 ra.

Finnst einhverjum essi breyting sem fram kemur hitamlinum hr fyrir ofan vera trlega ltil? Ef svo er, er rtt a taka fram stkkunargleri og skoa myndina hr fyrir nean, en hn er fr IPCC. Taki srstaklega eftir lrtta snum hgra megin og beri hann saman vi hitamlinn ga hr fyrir ofan:

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Hr sst sama hkkun undanfarinna 150 ra.
Eiginlega virist etta miklu meiri hkkun en hitamlinum.
Samt er etta sama hkkun um v sem nst 0,8C.


Maur verur a gta ess vel a lta svona tanda hitaferla ekki villa sr sn, en htt er vi a mrgum finnist eir gnvekjandi. tta sig ekki hve svii lrtta snum er lti.

(Einhver hugsar: a er engu lkara en mfluga hafi ori a lfalda, ea annig... Og svo hefur einhver veri a leggja einhverja planka myndina, og gtt ess vandlega a lta byrja lgum svo hallinn virist enn meiri. Uss... svona hugsa menn ekki. etta eru j verk til ess gerra vsidamanna sem kunna til verka...).

Myndin er upphaflega r skrslu Vsindanefndar Sameinuu janna (IPCC), en essi tgfa var fengin a lni r Skrslu vsindanefndar um hnattrnar loftslagsbreytingar og hrif eirra slandi - Umhverfisruneyti 2008. Stkka m mynd me v a smella nokkrum sinnum hana.

Vi gtum haldi fram a spyrja: Hvers vegna var svona hltt Steinld? Hvers vegna klnai aftur? Hvers vegna var svona hltt Rmverskum tma? Hvers vegna klnai aftur eftir a? Hvers vegna var svona hltt Landnmsld? Hvers vegna var svona ttalega kalt Litlu sld? Hvers vegna er svona notalega hltt n? Sasta spurningin er auveld. a er nefnilega samdma lit vsindamanna a a s mannfklinu a kenna. fnni tlensku kallast a scientific concensus. a er ekki lit allra, v sumir ttast a a muni klna aftur innan skamms. Af gmlum vana nttrunnar... Er a ekki arfa tti? Um a m ekki ra upphtt og v skulum vi egja nna... Annars koma einhverjir og sl putta okkar vitanna athugasemdunum hr eftir... Hverjir skyldu essir einhverjir vera... Er a kannski Jn Narr? Varla... Hverjir ?

tarefni:

Litla sldin - veurfar spjldum sgunnar
Erla Dra Vogler

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Er a ekki annars dlt merkilegt hve smvgileg breyting lofthita jarar
getur valdi miklum hita umrum og skrifum manna?
a er rugglega verugt og styrkhft rannsknarefni...

Sett vefinn laugardaginn 5. jn Anno Domini 2010 klukkan 08:20


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Ágúst H Bjarnason
Ágúst H Bjarnason

Verkfr. hjá Verkís.
agbjarn-hjá-gmail.com

Audiatur et altera pars

Aðeins málefnalegar athugasemdir, sem eiga ótvíætt við efni viðkomandi pistils, og skrifaðar án skætings og neikvæðni í garð annarra, og að jafnaði undir fullu nafni, verða birtar. 

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