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PostPosted: 23. March 2015, 00:35:46 AM 
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Dauernutzer
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Hello everyone :D

I have attached some fotos from my friend Aristeidis Voulgaris. He is still in Svalbard.

The sky was clear during totality and as you can see they got some flash spectra.

Cheers!
Alex

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PostPosted: 23. March 2015, 20:27:50 PM 
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Hi Alex,

nice impressions!

Now, well, what are they doing with such flash spectra?

ciao,
Daniel

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PostPosted: 23. March 2015, 20:39:14 PM 
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Aloha :D

The idea is to compare the intensity of Fe XIV. The stronger it is the more active the Sun is.
Also sometimes weak lines, that usually require a lot of energy to be produced, are detected. This gives a better understanding of the current status of the Sun.

Have a look here

http://arxiv.org/find/astro-ph/1/au:+Vo ... /0/all/0/1

The spectra form last Friday show that the lines are stong again.
Cheers
Alex :)

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PostPosted: 23. March 2015, 21:22:48 PM 
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Excellent stuff! Will they write an article for our journal?

Cheers, Thomas


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PostPosted: 24. March 2015, 08:53:02 AM 
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OK,

and these prominences are due to magnetic reconnection?

BTW: NASA is planing an interesting mission on that within the earth magnetic field:

https://www.youtube.com/watch?v=BGh1xc- ... e=youtu.be

http://science.nasa.gov/science-news/sc ... 10mar_mms/


cheers,
Daniel

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PostPosted: 24. March 2015, 17:37:45 PM 
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@Daniel

As far as I know the filaments are just the cold plasma following the magnetic lines. The Solar flares exist because of magn. reconnection.

@Thomas I can promise that I will ask.


Cheers :)
Alex

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PostPosted: 25. March 2015, 15:38:59 PM 
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Hello Alex
Quote:

The idea is to compare the intensity of Fe XIV.
Very Interesting. I did not realise the Fe XIV line was visible in the flash (chromospheric) spectrum. I thought it was only seen in the corona which is very blurred in slitless spectra


Cheers
Robin


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