Observation by Alun Halsey: Spectroheliogram in Hydrogen alpha 19/10...

Uploaded by

Alun Halsey

Observer

Alun Halsey

Observed

2022 Oct 19 - 14:00

Uploaded

2022 Oct 23 - 09:07

Objects

The Sun

Equipment

Self built spectroheliograph
Evostar 72ED apo doublet with full aperture Hoya Pro ND 16 filter
QHY5III 178M
CEM60

Location

Reading Berkshire UK

Target name

The Sun

Title

Spectroheliogram in Hydrogen alpha 19/10/22

About this image

DIY Spectroheliograph using 75mm focal length enlarger lens as collimator with 25um slit,30mm dia binocular objective of 120mm focal length as camera lens and 25x25mm 2400l/mm holographic grating. Using with 72ED full disk is not attainable so two scans were recorded,one for each hemisphere,and after reconstruction of images in MAIN-SER Ver 3.6.2 I used Microsoft ICE to stitch the two parts together and carried out slight processing in Astrosurface.

Files associated with this observation

SHG in Ha 221019_A.Halsey.jpg (426.4 kB)

Like this image

Mike Harlow, Alan Thomas, Gerard Cauchi, Robin Leadbeater, Mattia Piccoli, Peter Mulligan, Callum Wingrove, Nic Spencer

Comments

Mike Harlow, 2022 Oct 23 - 09:48 UTC

Hi Alun,

That's really impressive! If you have some pictures of the equipment you could share that would be very interesting. Sounds like you let the image of the Sun drift across the slit and synthesis the image that way?

Mike.

Alun Halsey

Gerard Cauchi, 2022 Oct 23 - 10:29 UTC

Yes, great work Alun. Well done.

Alun Halsey

Alun Halsey, 2022 Oct 23 - 21:54 UTC

Hi Mike,Gerard

Thank you both,will put together some photos of the SHG and post. Sorry Mike I forgot to mention that the scan across the Sun is forced by my using between x8 to x16 speed rates in RA on the CEM60 and the reconstruction software builds the image. This image is a single scan (no stacking) to which I have added a very slight sharpening and adjustment of gamma and brightness levels.

Alun

Mike Harlow

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