An Atlas of Spectroheliograms from 3641 to 6600 \AA
P. V\'aradi Nagy, A.G.M. Pietrow
TL;DR
This paper introduces a comprehensive spectral atlas of solar spectroheliograms from 3641 to 6600 Å, created during the 2025 solar maximum using amateur instruments, and made accessible online.
Contribution
It provides the first extensive, high-resolution spectral atlas of the Sun in this wavelength range from amateur observations, with interactive online access.
Findings
Spectral resolution ranges from 20,000 to 40,000.
Continuous coverage from 3711 to 5300 Å, with sparser data beyond.
Accessible online platform for detailed spectroheliogram navigation.
Abstract
We present a spectral atlas of solar spectroheliograms covering the wavelength range from 3641 to 6600 \AA, with continuous coverage between 3711 and 5300 \AA, and sparser coverage beyond this range. The spectral resolution varies between R 20 000 and 40 000, with a spectral step size between 60 and 90 m\AA, while the spatial resolution averages around 2.5 arcseconds. These observations were acquired over three months during the 2025 solar maximum, using amateur spectroheliographs (Sol'Ex and ML Astro SHG 700). The atlas is accessible via an interactive online platform with navigation tools and direct access to individual spectroheliograms.
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