British Astronomical Association
Supporting amateur astronomers since 1890

BAA Images Kevin Gurney

Observation by Kevin Gurney: Solar Ha first trials

Uploaded by

Kevin Gurney

Observer

Kevin Gurney

Observed

2018 Feb 24 - 16:30

Uploaded

2018 Mar 02 - 12:01

Objects

The Sun

Equipment
  • Rother Valley Optics 80mm refractor
  • Daystar Quark Chromosphere filter
  • ZWO ASI224MC camera
  • MESU200 mount
  • AS!2, Pixinsight, Prism
Location

Sheffield

Target name

Sun

Title

Solar Ha first trials

About this image

So given the paucity of clear skies at night, I thought I would try and double my chances with some daytime viewing. I therefore invested in a Daystar Quark (Chromosphere) filter at this year's Astrofest :)

The picture shows early trials over two days in February... The first one (top) is hopelessy overexposed but does bring out the prominence (? I'm new to solar - so terms are uncertain). The second is better exposed..

Both sessions were done, of course, with a low winter sun, so much atmospheric turbulence was  present. I took 7s and  10s videos and stacked in AstroStakkert! 2.6.8, followed by some work in Pixinsight (which I had used for deep sky thus far). It's a whole new 'kettle  of worms' here with bright images...

The main operation was to to do a bit of filtering in the frequency domain, as the original suffered heavily from some kind of regular banding interference. This didn't seem to go away with defocussing, so I am hoping my new high quality USB3 lead will help. I have read about 'Newtons rings' but my banding was linear and diagonal (but any advice welcome). Then I used the PI multiscale linear transform (MLT, = 'wavelets') and some light stretching.

The camera is what I had to hand and is colour, so not ideal, but I'll push this a bit for now. I have installed an old motorised focus now as the images  here were taken by manual control (tweak, look at screen, tweak...!)

I am reading about Stonhurst disks and the like, so hope to make things a bit more useful in subsequent sessions.

Files associated with this observation
Like this image
Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of work by third parties is expressly forbidden without the consent of the copyright holder. By submitting images to this online gallery, you grant the BAA permission to reproduce them in any of our publications.