By Eliot Herman | 2022-04-20
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On 04/20/2022 11:00 am by David Hoskin| Halifax, Nova Scotia, Canada
Hydrogen alpha (left) and white light (right) images of newly emerged sunspot group AR2995 and the huge sunspot complex AR2993-94. Hydrogen alpha imaging shows the Sun's chromosphere while white light imaging shows the Sun's photosphere. Prominences, filaments and are only visible in the hydrogen alpha image. The central umbra and surrounding penumbra of sunspots are visible in both images.
Hydrogen alpha image: Lunt 40mm Solar Telescope, ZWO ASI290MM plus 1.5x Barlow, SkyWatcher EQ6R Pro mount.
White light image: Celestron 102mm f/10 refractor with Baader solar filter, Canon T3i DSLR plus 1.5x Barlow, SkyWatcher EQ6R Pro mount.
Hydrogen alpha image: Best 500 frames stacked with AutoStakkert, sharped using IMPPG, Photoshop for other post-processing and addition of false color.
White light image: A single frame was sharpened and levels adjusted using Photoshop.
