Hello Everyone.
Here is a collection of images from my spectroheliography session of 23 June. The montage shows three chromospheres (hydrogen, calcium and helium) in four lights: Ca H (396.85 nm), H beta (486.13 nm), He D3 (587.56 nm) and H alpha (656.28 nm). These are the Fraunhofer H, F, D3 and C lines respectively.
Cheers.
Peter
23June2022: The Fraunhofer Four
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Re: 23June2022: The Fraunhofer Four
Fabulous!! I do find Helium D3 fascinating for the inverse plage
Alexandra
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Re: 23June2022: The Fraunhofer Four
Always nice to see your work Peter!
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