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APOD: A Flag Shaped Aurora over Sweden (2021 Mar 14)
Posted: Sun Mar 14, 2021 5:05 am
by APOD Robot
A Flag Shaped Aurora over Sweden
Explanation: It appeared, momentarily, like a 50-km tall banded flag. In mid-March of 2015, an energetic
Coronal Mass Ejection directed toward a clear magnetic channel to Earth led to one of the more intense
geomagnetic storms of recent years. A
visual result was wide spread
auroras being seen over many countries near
Earth's magnetic poles. Captured over
Kiruna,
Sweden, the
image features an unusually straight
auroral curtain with the
green color emitted low in the
Earth's atmosphere, and red many kilometers higher up. It is unclear where the rare
purple aurora originates, but it might involve an unusual
blue aurora at an even lower altitude than the green, seen superposed with a much higher red. Now past
Solar Minimum, colorful
nights of auroras over Earth are likely to increase.
Re: APOD: A Flag Shaped Aurora over Sweden (2021 Mar 14)
Posted: Sun Mar 14, 2021 8:38 am
by XgeoX
Is this near where you live Ann?
Re: APOD: A Flag Shaped Aurora over Sweden (2021 Mar 14)
Posted: Sun Mar 14, 2021 11:24 am
by De58te
Very nice. I think everybody should get to see an aurora in real time at least once in their life. I seen it once and it is gobsmacking. What is also amazing is how the photographer managed to pose the trees to point to the centre of the aurora. The trees on the right are pointed left, and the trees on the left are pointed right. I've never seen that before. Usually trees on average are influenced by the prevailing wind.
Re: APOD: A Flag Shaped Aurora over Sweden (2021 Mar 14)
Posted: Sun Mar 14, 2021 2:05 pm
by JohnP
See the flag of Azerbaijan:
https://www.freepik.com/premium-photo/w ... 897185.htm
Note the single star in the flag. What is the single star in the aurora's name?
Re: APOD: A Flag Shaped Aurora over Sweden (2021 Mar 14)
Posted: Sun Mar 14, 2021 2:09 pm
by Sa Ji Tario
De58te, Lie down in the middle of the road and take a picture of the skyscrapers and you will have the answer
Re: APOD: A Flag Shaped Aurora over Sweden (2021 Mar 14)
Posted: Sun Mar 14, 2021 2:53 pm
by Chris Peterson
XgeoX wrote: ↑Sun Mar 14, 2021 8:38 am
Is this near where you live Ann?
It's at the absolute opposite end of the country from Ann. 1000 km farther north.
Re: APOD: A Flag Shaped Aurora over Sweden (2021 Mar 14)
Posted: Sun Mar 14, 2021 3:51 pm
by neufer
Chris Peterson wrote: ↑Sun Mar 14, 2021 2:53 pm
XgeoX wrote: ↑Sun Mar 14, 2021 8:38 am
Is this near where you live Ann?
It's at the absolute opposite end of the country from Ann. 1000 km farther north.
Ann practices Kiruna social distancing and (as I recall) she claims to have never observed an aurora.
Re: APOD: A Flag Shaped Aurora over Sweden (2021 Mar 14)
Posted: Sun Mar 14, 2021 4:15 pm
by orin stepanek
On top of the it all! Please don't jump!
It's god's gift!
Re: APOD: A Flag Shaped Aurora over Sweden (2021 Mar 14)
Posted: Sun Mar 14, 2021 4:30 pm
by neufer
Sa Ji Tario wrote: ↑Sun Mar 14, 2021 2:09 pm
De58te, Lie down in the middle of the road and take a picture of the skyscrapers and you will have the answer
- Note: The Starship Asterisk* does not recommend (or generally condone)
lying down in the middle of the road in order to take pictures of skyscrapers
Re: APOD: A Flag Shaped Aurora over Sweden (2021 Mar 14)
Posted: Mon Mar 15, 2021 9:32 am
by VictorBorun
They say the blue stripe is N₂ 8-100 km high, a faint glow where O atoms are colliding with N₂ too frequently to produce their green or red.
So the snapsot must be misleading and confusing when suggests to place the blue stripe atop of red and green ones.
In fact the blue stripe must be extremely low, just above the clouds.
Re: APOD: A Flag Shaped Aurora over Sweden (2021 Mar 14)
Posted: Mon Mar 15, 2021 3:39 pm
by deboerbb
Compare the flag of Azerbaijan. (Low probability of getting a thin crescent moon in the right place, though.)