Observation by Michael O'Connell: Sun Solex Helium

Uploaded by

Michael O'Connell

Observer

Michael O'Connell

Observed

2025 Jul 13 - 09:06

Uploaded

2025 Jul 18 - 19:14

Objects

The Sun

Location

Narraghmore, Kildare, Ireland

Target name

The Sun

Title

Sun Solex Helium

About this image

Files associated with this observation

20250713_helium-extracted_0_00-processed-small.png (580.7 kB)

Like this image

Callum Potter, Mike Foulkes, Dominic Ford, Robin Leadbeater, James Weightman, Anton Matthews

Comments

Robin Leadbeater, 2025 Jul 20 - 14:38 UTC

Hi Michael,

Can you explain a bit about what we are seeing here? Is this at D3 5876A ? This line does not appear in the Solar photospheric spectrum so how do you find the right wavelength? Is this image a direct measurement at this wavelength or has an image of the adjacent continuum been subtracted ?

Thanks

Robin

Michael O'Connell

Michael O'Connell, 2025 Jul 20 - 18:08 UTC

Hi Robin,

Yes, this is D3 5876A. And yes, it is an indirect measurement by subtracting a nearby line (such as Fe 5884 or Sodium D1).

I use the softare JSol'Ex for my processing. I suggest you look at the YouTube video (with autotranslate subtitles to English) 'What's new in JSol'Ex 2.4?' by 'Cédric Champeau', who wrote JSol'Ex. Also worth watching 'Observation du Soleil dans le lumière de l'hélium' by 'Astro-Spectro'

Michael

Robin Leadbeater

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