APOD: Planet Aurora (2015 Jun 26)

Comments and questions about the APOD on the main view screen.
User avatar
APOD Robot
Otto Posterman
Posts: 4730
Joined: Fri Dec 04, 2009 3:27 am

APOD: Planet Aurora (2015 Jun 26)

Post by APOD Robot » Fri Jun 26, 2015 4:06 am

Image Planet Aurora

Explanation: What bizarre alien planet is this ? It's planet Earth of course, seen through the shimmering glow of aurorae from the International Space Station. About 400 kilometers (250 miles) above, the orbiting station is itself within the upper realm of the auroral displays, also watched from the planet's surface on June 23rd. Aurorae have the signature colors of excited molecules and atoms at the low densities found at extreme altitudes. The eerie greenish glow of molecular oxygen dominates this view. But higher, just above the space station's horizon, is a rarer red band of aurora from atomic oxygen. The ongoing geomagnetic storm began after a coronal mass ejection's recent impact on Earth's magnetosphere.

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

Boomer12k
:---[===] *
Posts: 2691
Joined: Sun Apr 22, 2007 12:07 am

Re: APOD: Planet Aurora (2015 Jun 26)

Post by Boomer12k » Fri Jun 26, 2015 4:29 am

Awesome.... Molecular Oxygen....Atomic Oxygen.... What are the differences???

Thanks.

:---[===] *

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

Re: APOD: Planet Aurora (2015 Jun 26)

Post by Nitpicker » Fri Jun 26, 2015 5:24 am

Boomer12k wrote:Awesome.... Molecular Oxygen....Atomic Oxygen.... What are the differences???

Thanks.

:---[===] *
I didn't know either, so I looked it up:
https://en.wikipedia.org/wiki/Allotropes_of_oxygen

Boomer12k
:---[===] *
Posts: 2691
Joined: Sun Apr 22, 2007 12:07 am

Re: APOD: Planet Aurora (2015 Jun 26)

Post by Boomer12k » Fri Jun 26, 2015 10:03 am

Nitpicker wrote:
Boomer12k wrote:Awesome.... Molecular Oxygen....Atomic Oxygen.... What are the differences???

Thanks.

:---[===] *
I didn't know either, so I looked it up:
https://en.wikipedia.org/wiki/Allotropes_of_oxygen
No!!!!..... Head.....bursting.....from too......many......new terms.......passing.....out......uhhhhhhh......

Thanks,
:---(===) *

User avatar
kellogg
Ensign
Posts: 25
Joined: Wed Feb 25, 2015 3:36 pm
Location: WV

Re: APOD: Planet Aurora (2015 Jun 26)

Post by kellogg » Fri Jun 26, 2015 10:04 am

Amazing!

There's an article in Space.com about auroras on Mars possibly being visible from the surface.
Makes me wonder if Hubble could spot Mars auroras from space?

Scott

songwriterz
Ensign
Posts: 18
Joined: Fri Nov 04, 2005 1:18 pm

Re: APOD: Planet Aurora (2015 Jun 26)

Post by songwriterz » Fri Jun 26, 2015 11:19 am

"Shields up, Mr. Spock!"

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

Re: APOD: Planet Aurora (2015 Jun 26)

Post by Ron-Astro Pharmacist » Fri Jun 26, 2015 2:39 pm

I'd say it's an obvious case of "glow ball "warming except we all know that's from increases in carbon dioxide. But isn't CO2 heavier than O2? I'm no expert in atmospheric gasses but as CO2 emissions increase you wonder what other effects may occur. Guess we'll just have to sit back and watch the fireworks as they will likely soon occur.

http://www.gi.alaska.edu/AuroraForecast/NorthAmerica

At least - in Canada. Us in the US will have to make our own :D
Make Mars not Wars

starsurfer
Stellar Cartographer
Posts: 4824
Joined: Thu Mar 15, 2012 7:25 pm

Re: APOD: Planet Aurora (2015 Jun 26)

Post by starsurfer » Fri Jun 26, 2015 3:01 pm

Jupiter and Saturn are also known to exhibit aurorae.

Evenstar
Ensign
Posts: 38
Joined: Sun Mar 28, 2010 6:28 am

Re: APOD: Planet Aurora (2015 Jun 26)

Post by Evenstar » Fri Jun 26, 2015 3:29 pm

The magnetosphere encompasses a large area around Earth... Where is the ISS orbit relative to it/in it? On the ISS is there human exposure/risk? Is the crew "hiding out" within the densest shielded areas until the storm passed?
<Evenstar>

User avatar
Chris Peterson
Abominable Snowman
Posts: 16822
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Planet Aurora (2015 Jun 26)

Post by Chris Peterson » Fri Jun 26, 2015 3:36 pm

Evenstar wrote:I think the magnetosphere encompasses a large area around Earth... Where is the ISS orbit relative to it? On the ISS what is the human exposure / risk? (Is or) Did the crew need to "hide out" within extra shielded areas until the storm passed?
The primary risk to astronauts is cosmic rays. CMEs actually reduce their exposure to cosmic rays for a short period, and don't typically produce particles which penetrate the ISS. However, for particularly strong solar flares there are radiation safety protocols that involve relocating to more highly shielded areas of the space station, or even reorienting the entire structure.
Chris

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

John Erickson

Re: APOD: Planet Aurora (2015 Jun 26)

Post by John Erickson » Fri Jun 26, 2015 6:54 pm

Another interesting feature of note in this photograph--It shows stars! At first I was puzzled, because daytime photos of Earth from ISS never show stars. Then I realized that this is not a daylight photo. (It is amazing how much it looks like one.) The exposure they used to make the auroral light show up well in the photo also made the stars show up. Or so I suppose.

Markus Schwarz
Science Officer
Posts: 225
Joined: Wed Apr 29, 2009 11:55 am
Location: Germany

Re: APOD: Planet Aurora (2015 Jun 26)

Post by Markus Schwarz » Fri Jun 26, 2015 8:45 pm

John Erickson wrote:Another interesting feature of note in this photograph--It shows stars! At first I was puzzled, because daytime photos of Earth from ISS never show stars. Then I realized that this is not a daylight photo. (It is amazing how much it looks like one.) The exposure they used to make the auroral light show up well in the photo also made the stars show up. Or so I suppose.
I hadn't noticed that. Thank you for pointing this out. :clap: