APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Comments and questions about the APOD on the main view screen.
User avatar
APOD Robot
Otto Posterman
Posts: 4478
Joined: Fri Dec 04, 2009 3:27 am

APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by APOD Robot » Mon Jun 01, 2015 4:06 am

[No picture] Pulsating Aurora over Iceland

Explanation: Why do some auroras pulsate? No one is sure. Although this unusual behavior has been known for a long time, the cause remains an active topic of research. Featured here is a dramatic video that captured some impressive pulsating auroras in mid-March over Svínafellsjökull Glacier in Iceland. The 48-second video is shown is not time-lapse. The real-time pulsations are exemplified by sequences where the astrophotographer is visible moving about in the foreground. A close inspection of the enigmatic flickering sky colors reveals that some structures appear to repeat, while others do not. The quick rapidity of the pulsations seen here is somewhat unusual -- more common are aurora with pulsations that last several seconds. Recent research shows that pulsations are more common in electron-generated aurora, rather than proton aurora, and that the Earth's local magnetic field may fluctuate in unison.

<< Previous APOD This Day in APOD Next APOD >>
[/b]

Dr. Bob Jackson

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by Dr. Bob Jackson » Mon Jun 01, 2015 4:46 am

This is called Astronomy Picture of the Day, not Video of the Day. I am outraged at the false advertising, the need to click slow-loading videos, and the abandonment of your principles in favor of the gaping slack-jawed yokels who must drool at a video all day long.

User avatar
geckzilla
Ocular Digitator
Posts: 9158
Joined: Wed Sep 12, 2007 12:42 pm
Location: Modesto, CA

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by geckzilla » Mon Jun 01, 2015 5:04 am

It's ok, Bob. There's always tomorrow.
Just call me "geck" because "zilla" is like a last name.

User avatar
Nitpicker
Inverse Square
Posts: 2692
Joined: Fri Sep 20, 2013 2:39 am
Location: S27 E153

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by Nitpicker » Mon Jun 01, 2015 6:53 am

Damn, I hate it when the slack-jawed yokels have faster internet than me. I'm a purist too, Dr Bob. I kept my eyes closed long enough for me to pause the video, just so that I could admire a still frame in the sanctimonious manner to which I am accustomed. Ahhhhh.

User avatar
geckzilla
Ocular Digitator
Posts: 9158
Joined: Wed Sep 12, 2007 12:42 pm
Location: Modesto, CA

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by geckzilla » Mon Jun 01, 2015 7:17 am

Whether or not you think APOD should feature videos from time to time, today's moving picture would have been much less compelling without the video. I have never seen a pulsating aurora before, even as a video. I wouldn't know what to make of the picture if it were a still photo and the description told of the photographer's experience and that the aurora was pulsating. There are many ways in which a thing could be described as pulsating and the quickest way to make it clear is with a video. So, thanks, Stéphane.
Just call me "geck" because "zilla" is like a last name.

User avatar
Ann
4725 Å
Posts: 11650
Joined: Sat May 29, 2010 5:33 am

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by Ann » Mon Jun 01, 2015 7:42 am

Looks like some of the stars are pulsating, too.

Ann
Color Commentator

failed phd candidate

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by failed phd candidate » Mon Jun 01, 2015 7:49 am

I don't think an Aurora is a pulsating phenomenon. Rather, it appears to be an optical illusion due to atmospheric activity in the upper atmosphere of the Earth. Or, the pulsating appearance may be the result of sunlight bouncing off the ionic fabric of the Aurora. Whatever the explanation, it is a topic which deserves research and plenty of funding. There is at least one other reason why an Aurora appears to pulsate. However, rather than spill my brains out for an issue without compensation I will let it go here sorry ..

User avatar
geckzilla
Ocular Digitator
Posts: 9158
Joined: Wed Sep 12, 2007 12:42 pm
Location: Modesto, CA

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by geckzilla » Mon Jun 01, 2015 8:39 am

Ann wrote:Looks like some of the stars are pulsating, too.
I noticed that. I think it might be a quirk with how the camera works, some kind of compression thing, and atmospheric twinkling on top of one or both of those.
Just call me "geck" because "zilla" is like a last name.

User avatar
Nuitsacrees
Ensign
Posts: 41
Joined: Mon Oct 18, 2010 4:34 pm

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by Nuitsacrees » Mon Jun 01, 2015 9:17 am

Hello,
Thank you to appreciate. Sorry, Dr. Bob, but transcribe a phenomenon so dynamic, is impossible, other than with a video. For technical reasons, the filmed portions are quite narrow (full frame camera, 24mm lens, F1,4). To the naked eye, it seemed a flow of energy, extremely fast, that were flashing all the sky. Anyway, it was something very impressive. Another observation is that, blinking are red (the camera is modified to be more sensitive in the H-alpha radiation). Especially for Ann, "Pulsating Aurora" is an appetizer, I recommend the main course, "Litríkur Stormur" ( Color Storm in icelandic) :
Stephane Vetter

hoohaw

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by hoohaw » Mon Jun 01, 2015 9:25 am

The video was great, and it ran smoothly even on my relatively old Mac. And seeing it took me back to my youth in Canada, seeing this kind of thing from time to time in the heavens above! Good work as usual, APOD!

User avatar
Ann
4725 Å
Posts: 11650
Joined: Sat May 29, 2010 5:33 am

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by Ann » Mon Jun 01, 2015 10:50 am

Nuitsacrees wrote:Hello,
Thank you to appreciate. Sorry, Dr. Bob, but transcribe a phenomenon so dynamic, is impossible, other than with a video. For technical reasons, the filmed portions are quite narrow (full frame camera, 24mm lens, F1,4). To the naked eye, it seemed a flow of energy, extremely fast, that were flashing all the sky. Anyway, it was something very impressive. Another observation is that, blinking are red (the camera is modified to be more sensitive in the H-alpha radiation). Especially for Ann, "Pulsating Aurora" is an appetizer, I recommend the main course, "Litríkur Stormur" ( Color Storm in icelandic) :
Stephane Vetter
Beautiful video, Stephane! Particularly, for me, the amazing bluish aurora in the first part of it. But it is all very beautiful.

Ann
Color Commentator

Animal of Stone

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by Animal of Stone » Mon Jun 01, 2015 11:20 am

Does not matter how or why this effect is produced. Am sure the video is not out there to manipulate. Stand back and take in the awe.

User avatar
Chris Peterson
Abominable Snowman
Posts: 16214
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by Chris Peterson » Mon Jun 01, 2015 2:24 pm

geckzilla wrote:Whether or not you think APOD should feature videos from time to time, today's moving picture would have been much less compelling without the video. I have never seen a pulsating aurora before, even as a video. I wouldn't know what to make of the picture if it were a still photo and the description told of the photographer's experience and that the aurora was pulsating. There are many ways in which a thing could be described as pulsating and the quickest way to make it clear is with a video. So, thanks, Stéphane.
I don't have a problem with the occasional video. Unfortunately, my Internet quality means I can't really stream them, however. I wish that more were available for direct download. As it is, I have to use a third party capture tool to snag the video from Vimeo in order to properly view it from my computer. That's a lot of trouble... enough that I only do it with videos that really catch my interest. This one hasn't risen to that level, so I haven't yet seen it. I may or may not.
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

User avatar
Nuitsacrees
Ensign
Posts: 41
Joined: Mon Oct 18, 2010 4:34 pm

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by Nuitsacrees » Mon Jun 01, 2015 3:01 pm

Chris Peterson wrote:
geckzilla wrote:Whether or not you think APOD should feature videos from time to time, today's moving picture would have been much less compelling without the video. I have never seen a pulsating aurora before, even as a video. I wouldn't know what to make of the picture if it were a still photo and the description told of the photographer's experience and that the aurora was pulsating. There are many ways in which a thing could be described as pulsating and the quickest way to make it clear is with a video. So, thanks, Stéphane.
I don't have a problem with the occasional video. Unfortunately, my Internet quality means I can't really stream them, however. I wish that more were available for direct download. As it is, I have to use a third party capture tool to snag the video from Vimeo in order to properly view it from my computer. That's a lot of trouble... enough that I only do it with videos that really catch my interest. This one hasn't risen to that level, so I haven't yet seen it. I may or may not.
You can directly download this video from Vimeo : https://vimeo.com/128714112 , tab "download"
Stephane

User avatar
Chris Peterson
Abominable Snowman
Posts: 16214
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by Chris Peterson » Mon Jun 01, 2015 3:34 pm

Nuitsacrees wrote:
Chris Peterson wrote:I don't have a problem with the occasional video. Unfortunately, my Internet quality means I can't really stream them, however. I wish that more were available for direct download. As it is, I have to use a third party capture tool to snag the video from Vimeo in order to properly view it from my computer. That's a lot of trouble... enough that I only do it with videos that really catch my interest. This one hasn't risen to that level, so I haven't yet seen it. I may or may not.
You can directly download this video from Vimeo : https://vimeo.com/128714112 , tab "download"
Stephane
Thanks! Never noticed that option before.
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

thermium

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by thermium » Mon Jun 01, 2015 5:36 pm

The stars looked OK to me, remember that the light of the aurora is added to the light of the stars, no blocking of the background light occurs. The stars would then, sort of, pulsate a little themselves as the intensity of the light varied. If you look 2/3 of the way across from the left and about 1/4 of the way from the top, there is a planet or something moving against the stars toward the bottom.

thermium

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by thermium » Mon Jun 01, 2015 5:39 pm

...between time 0:04 and 0:12 at the beginning.

User avatar
geckzilla
Ocular Digitator
Posts: 9158
Joined: Wed Sep 12, 2007 12:42 pm
Location: Modesto, CA

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by geckzilla » Mon Jun 01, 2015 5:42 pm

I'm guessing that most people who upload their videos do not enable the download option.
Just call me "geck" because "zilla" is like a last name.

User avatar
Ron-Astro Pharmacist
Resistored Fizzacist
Posts: 889
Joined: Thu Jan 03, 2013 10:34 pm
AKA: Fred
Location: Idaho USA

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by Ron-Astro Pharmacist » Mon Jun 01, 2015 5:50 pm

I can't imagine what early hominids thought of auroras. Maybe it's the sound on the video but the shapes they create almost seem angelic pulsating as they move across the sky.
Angel Aurora.jpg
Edit - Here are a few examples from a quick search.

http://www.polarbearsinternational.org/ ... pretations

http://www.amscan.org/pdf/Fall08AuroraBorealis.pdf

http://www.vikinganswerlady.com/njordrljos.shtml
You do not have the required permissions to view the files attached to this post.
Last edited by Ron-Astro Pharmacist on Mon Jun 01, 2015 6:24 pm, edited 1 time in total.
Make Mars not Wars

User avatar
Chris Peterson
Abominable Snowman
Posts: 16214
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by Chris Peterson » Mon Jun 01, 2015 6:00 pm

geckzilla wrote:I'm guessing that most people who upload their videos do not enable the download option.
Probably not. But it's nice for those of us with slow Internet. And you can download any of the videos using third party tools, so there's little protective value in disabling that option.
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

rwlott
Ensign
Posts: 27
Joined: Fri May 06, 2011 7:05 pm

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by rwlott » Mon Jun 01, 2015 6:48 pm

I, too, don't mind the occasional, infrequent video. In this particular case, I don't see how a still picture could have conveyed to essence of this phenomenon. And for me, the most interesting aspect of today's entry is knowing that these images were not shown in time-lapse. I don't know what the photographer's intentions where when she walked in front of camera, but doing so very effectively demonstrates that the pulsations are depicted in real time—and if that was the sole intent, then kudos for thinking of it.

NateWhilk
Ensign
Posts: 25
Joined: Sat Jun 16, 2012 7:05 pm

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by NateWhilk » Mon Jun 01, 2015 7:52 pm

Nuitsacrees wrote:I recommend the main course, "Litríkur Stormur" ( Color Storm in icelandic)
The segment starting at 4:50--Incredible! Magnificent! Merci beaucoup!

User avatar
LocalColor
Science Officer
Posts: 266
Joined: Sat Mar 31, 2012 9:11 pm
Location: Central Idaho, USA

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by LocalColor » Mon Jun 01, 2015 9:30 pm

Thank you Stephane Vetter, that was very nice video and the "Litríkur Stormur" was fantastic!

User avatar
alter-ego
Serendipitous Sleuthhound
Posts: 975
Joined: Mon Apr 21, 2008 4:51 am
Location: Redmond, WA

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by alter-ego » Tue Jun 02, 2015 4:10 am

rwlott wrote:I, too, don't mind the occasional, infrequent video. In this particular case, I don't see how a still picture could have conveyed to essence of this phenomenon. And for me, the most interesting aspect of today's entry is knowing that these images were not shown in time-lapse. I don't know what the photographer's intentions where when she walked in front of camera, but doing so very effectively demonstrates that the pulsations are depicted in real time—and if that was the sole intent, then kudos for thinking of it.
My view exactly.
Here at my house, I was treated to an amazing pulsating aurora in 2004. Unlike the today's AVOD, the one I witnessed was incredibly symmetric. Not only did I see a very large auroral corona directly overhead (at first I thought the sky was clouded out LOL!), there were concentric annular rings, maybe 5°to 10°thick, starting from the convergence point and propagating outward to edges of the corona where the rings would disappear. Only one ring at a time would form but they each would traverse the display in a fraction of a second, and they appeared at the rate a couple or few times a second. I felt like I was in a huge, old sci-fi tractor beam! I've never seen (nor hear of) anything like it before or since, and today is the first I've seen pulsating auroras mentioned let alone a video. Every time I think about this experience I wish I had a video of it. My words really don't do it justice.
A pessimist is nothing more than an experienced optimist

User avatar
DavidLeodis
Perceptatron
Posts: 1169
Joined: Mon May 01, 2006 1:00 pm

Re: APOD: Pulsating Aurora over Iceland (2015 Jun 01)

Post by DavidLeodis » Tue Jun 02, 2015 9:06 pm

rwlott wrote:I, too, don't mind the occasional, infrequent video. In this particular case, I don't see how a still picture could have conveyed to essence of this phenomenon. And for me, the most interesting aspect of today's entry is knowing that these images were not shown in time-lapse. I don't know what the photographer's intentions where when she walked in front of camera, but doing so very effectively demonstrates that the pulsations are depicted in real time—and if that was the sole intent, then kudos for thinking of it.
I'm having trouble readily finding information about Stéphane but had thought that name is Stephen and so the photographer was male. Unless you knew about Stéphane you have better eyesight than me rwlott to indentify Stéphane as female from the video! :wink: