What a quiet sun today! Disc & Surface in CaK, Aug 31 2018

this is the main message area for anything solar :)
Post Reply
User avatar
MalVeauX
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1853
Joined: Tue May 09, 2017 7:58 pm
Location: Florida
Has thanked: 1142 times
Been thanked: 1329 times

What a quiet sun today! Disc & Surface in CaK, Aug 31 2018

Post by MalVeauX »

Heya,

Man, what a quiet sun today. Very few prom groups that are impressive. Very few faculae. No spots at all. Really, truly, a nearly void disc. At high resolution you can see some minor active areas that are interesting, but they're very tiny, and scattered. There's an active area coming around the limb that is slightly interesting, but no proms near it, and all the big filaments are pretty much gone too. So I just chose some random areas with some activity and only imaged in 3934A today and took a look at the small active area coming around the limb and the larger active field near the center of the disc.

100mm (masked the 6") F12 refractor with Chroma 393.4 BP1nm & PST CaK Filter with ASI174MM & 3x Barlow for the larger scale images.
40mm F10 refractor without the barlow for the small scale image of the disc.

Image

Image

Image

Image

Image

Image

Colored versions:

Image

Image

Image

Image

Image

Image

++++++++++++++++++++++++++++++++++++
setup_08312018.jpg
setup_08312018.jpg (128.42 KiB) Viewed 1834 times
Conditions (eye roll!)
conditions_08312018.jpg
conditions_08312018.jpg (74.01 KiB) Viewed 1834 times
Very best,


User avatar
krakatoa1883
Almost There...
Almost There...
Posts: 1041
Joined: Sat Jun 11, 2016 9:41 am
Location: Mediolanum
Has thanked: 153 times
Been thanked: 496 times

Re: What a quiet sun today! Disc & Surface in CaK, Aug 31 2018

Post by krakatoa1883 »

Very good images, Marty, stopping down the aperture makes contrast higher. With my 150 f/5 I can't go beyond 100mm, the same aperture with your f/8 ensures better definition and sharpness.

May I suggest not to burn the center of the disc but try to obtain a more uniform brightness between center and edge, something like this
marty fd mod.jpg
marty fd mod.jpg (260.99 KiB) Viewed 1827 times
Best,


Raf
My solar images and reports with articles on solar equipment
User avatar
MalVeauX
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1853
Joined: Tue May 09, 2017 7:58 pm
Location: Florida
Has thanked: 1142 times
Been thanked: 1329 times

Re: What a quiet sun today! Disc & Surface in CaK, Aug 31 2018

Post by MalVeauX »

Thanks Raf,

Mind sharing how you adjusted the curve for the more uniform look?

Thanks!

Very best,


User avatar
krakatoa1883
Almost There...
Almost There...
Posts: 1041
Joined: Sat Jun 11, 2016 9:41 am
Location: Mediolanum
Has thanked: 153 times
Been thanked: 496 times

Re: What a quiet sun today! Disc & Surface in CaK, Aug 31 2018

Post by krakatoa1883 »

I lowered the right side of the "curves" function in GIMP

https://docs.gimp.org/en/gimp-tool-curves.html


Raf
My solar images and reports with articles on solar equipment
User avatar
Carbon60
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 14175
Joined: Wed Mar 07, 2012 12:33 pm
Location: Lancashire, UK
Has thanked: 8355 times
Been thanked: 8103 times

Re: What a quiet sun today! Disc & Surface in CaK, Aug 31 2018

Post by Carbon60 »

Very nice CaK images, Marty, even for a quiet sun.

Stu.


H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
User avatar
MalVeauX
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1853
Joined: Tue May 09, 2017 7:58 pm
Location: Florida
Has thanked: 1142 times
Been thanked: 1329 times

Re: What a quiet sun today! Disc & Surface in CaK, Aug 31 2018

Post by MalVeauX »

krakatoa1883 wrote: Fri Aug 31, 2018 7:51 pm I lowered the right side of the "curves" function in GIMP

https://docs.gimp.org/en/gimp-tool-curves.html
Thanks,

I tried lowering the right of the curve to match the angle of the histogram. What do you think?
Disc-Edit.jpg
Disc-Edit.jpg (168.86 KiB) Viewed 1814 times
Very best,


User avatar
krakatoa1883
Almost There...
Almost There...
Posts: 1041
Joined: Sat Jun 11, 2016 9:41 am
Location: Mediolanum
Has thanked: 153 times
Been thanked: 496 times

Re: What a quiet sun today! Disc & Surface in CaK, Aug 31 2018

Post by krakatoa1883 »

Much better, very nice!


Raf
My solar images and reports with articles on solar equipment
User avatar
MalVeauX
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1853
Joined: Tue May 09, 2017 7:58 pm
Location: Florida
Has thanked: 1142 times
Been thanked: 1329 times

Re: What a quiet sun today! Disc & Surface in CaK, Aug 31 2018

Post by MalVeauX »

Thanks all,

Always appreciate input to improve. :bow

Very best,


User avatar
Montana
Librarian
Librarian
Posts: 34527
Joined: Mon Oct 17, 2011 5:25 pm
Location: Cheshire, UK
Has thanked: 17523 times
Been thanked: 8763 times

Re: What a quiet sun today! Disc & Surface in CaK, Aug 31 2018

Post by Montana »

Stunning hi res, I think that is going to be what will be of most interest over minimum :hamster: :bow

Can I ask what is wrong with the first full disc? when I look through the telescope the Sun does look like that, so why does it have to be flat? see the blue image (CaK) here too https://www.kso.ac.at/index.php

Alexandra


User avatar
MalVeauX
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1853
Joined: Tue May 09, 2017 7:58 pm
Location: Florida
Has thanked: 1142 times
Been thanked: 1329 times

Re: What a quiet sun today! Disc & Surface in CaK, Aug 31 2018

Post by MalVeauX »

I think it's just another paradigm of presentation. :)

Very best,


User avatar
Valery
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 4059
Joined: Sun Nov 18, 2012 3:13 pm
Has thanked: 156 times
Been thanked: 893 times

Re: What a quiet sun today! Disc & Surface in CaK, Aug 31 2018

Post by Valery »

PST filter makes a great difference in your images! Nice shots.


"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
User avatar
krakatoa1883
Almost There...
Almost There...
Posts: 1041
Joined: Sat Jun 11, 2016 9:41 am
Location: Mediolanum
Has thanked: 153 times
Been thanked: 496 times

Re: What a quiet sun today! Disc & Surface in CaK, Aug 31 2018

Post by krakatoa1883 »

Montana wrote: Mon Sep 03, 2018 9:07 am Can I ask what is wrong with the first full disc? when I look through the telescope the Sun does look like that, so why does it have to be flat? see the blue image (CaK) here too https://www.kso.ac.at/index.php
Hi Alexandra, today I spent few minutes looking through my calcium Quark (in spite of Daystar's claims on its safety I wouldn't recommend this exercise to anyone) and I noted that yes there is some center brightening and limb darkening but they are subtle, less evident than in WL. However I think that flattening the disc it's a matter of personal taste at least for our purposes here.


Raf
My solar images and reports with articles on solar equipment
User avatar
marktownley
Librarian
Librarian
Posts: 42131
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 20240 times
Been thanked: 10113 times
Contact:

Re: What a quiet sun today! Disc & Surface in CaK, Aug 31 2018

Post by marktownley »

Great set of images Marty! That's a great homebrew CaK filter you have there.


Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
Post Reply