Observation by John Arnold: Sunspot group AR4172 activity in H-alpha

Uploaded by

John Arnold

Observer

John Arnold

Observed

2025 Aug 15 - 10:36

Uploaded

2025 Aug 16 - 10:59

Objects

The Sun

Equipment

Skywatcher 82 mm Evolux f/6.5 refractor, Daystar Quark chromosphere unit, 0.5x focal reducer, ZWO ASI678MM camera

Exposure

exp. time 0.032 msec, each frame of gif is stack of best 100 from 2,000-frame video, with 10 second interval between successive videos

Location

Suburban North Leeds

Target name

Sunspot group AR4172

Title

Sunspot group AR4172 activity in H-alpha

About this image

H-alpha activity of AR4172 over the course of 17 minutes, though the main activity had already occurred when I started the animation sequence

Files associated with this observation

AR4172 1036-1053UT on 150825.gif (877.9 kB)

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Dominic Ford

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