Solar activity 17 April 2021 (rdk_CA)

Contains: Solar system body or event

Solar activity 17 April 2021

Acquisition type: Lucky imaging

Solar activity 17 April 2021

Acquisition type: Lucky imaging

Spring is always a tough time for solar imaging (at least for me!) Living in a heavily light polluted Bay Area, I generally have to focus my efforts on narrow band, lunar, and planetary imaging. Most of the available targets are now below the horizon in the early evening during this time of year. In addition, the Bay Area fog is obscuring any attempts at getting planetary images in the morning. Thankfully, after the fog burns off during the day, solar imaging is still a possibility.

This image was obtained using a Daystar Quark filter optimized for the chromosphere, through a 80 mm refractor telescope. Data was acquired over a 30 s interval at a frame rate of approximately 30 fps, with the camera gain set to 170. Different exposure times were used to capture the chromosphere and solar flare details. I stacked the best 25% of the frames using AutoStakkert! 3, followed by sharpening in Registax. I then cleaned up some of the noise in Neat Image Pro. I then combined the two different exposures using Corel Paint Shop Pro. The chromosphere image was inverted to make the blending of intensity of the solar flares to the solar disk cleaner.

Final
Original
B

B

Description: Revision B shows some small sun spot activity on the opposite limb on the sun.

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Solar activity 17 April 2021

Solar activity 17 April 2021

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