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Some continuum images from September 3 (EdgeHD 11)

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#1 LauraMS

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Posted 03 September 2017 - 06:17 PM

Hello,

 

moderate seeing today but - before noon high transparency allowed for some nice shots.

 

First, impressive AR12674:

 

Folie4.JPG

 

 

This looks like extremely good seeing. However, the SSM output shows that it was more like the typical high variation of seeing. Patience was needed to have the SSM triggerd to phases of excellent seeing, otherwise seeing was on the order of typical daytime values (2-3 as):

 

SSM 0.59.PNG


Edited by LauraMS, 03 September 2017 - 06:26 PM.

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#2 LauraMS

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Posted 03 September 2017 - 06:18 PM

Some smaller regions (AR12675 and AR12676) are about to diseappear behind the limb:

 

Folie6.JPG


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#3 LauraMS

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Posted 03 September 2017 - 06:18 PM

And one active region has appeared at the eastern limb, which hasn't yet been assigned (AR12677 ?):

 

Folie7.JPG

 

Enjoy,
Laura


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#4 CockatooDude

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Posted 03 September 2017 - 07:14 PM

Wow, very nice detail. Good job with these.



#5 LauraMS

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Posted 03 September 2017 - 07:20 PM

Thanks, CockatooDude

#6 AKHalea

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Posted 03 September 2017 - 10:12 PM

Very nice images, Laura. One question from this newbie to solar imaging - can the prominences be imaged in WL or does one need to have an H-Alpha type scope to see proms? I presume the latter, but don't know for sure. Also, is the etalon a "must have" for seeing & imaging proms at the edges? Thanks in advance ...... Anil


Edited by AKHalea, 03 September 2017 - 10:13 PM.


#7 LauraMS

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Posted 04 September 2017 - 01:48 AM

Thanks, Anil.

 

Prominences can only be seenin Halpha, not in WL. They are much too dim and need a special Halpha  filter where "normal" sunlight is suppressed and the prominences (and their counterpart  on the solar surface, filaments) come out. You need a very narrowband Halpha filter for  this. For prominences at the limb, it must be around 1Angstrom = 0.1nm, for surface detail you need 0.7A = 0.07nm or even better, much less.  Unfortunately, this is not exactly cheap technology. You can go for entry level Halpha telescopes like the PST or the Lunt or Daystar, or you use a Daystar Chromosphere  in combination with your refractor. If you use your refractor, you need some type of energy rejection filter to reducethe amount of transmitted heat - NEVER work at the sun without appropriate filtering!




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