Contains:  Solar system body or event
Solar granulation on August 22th 2015, Arne Danielsen

Solar granulation on August 22th 2015

Acquisition type: Lucky imaging
Solar granulation on August 22th 2015, Arne Danielsen

Solar granulation on August 22th 2015

Acquisition type: Lucky imaging

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Acquisition details

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Description

Close-up image of the Sun from August 22th 2015 showing the solar granulation on the photosphere caused by convection currents. The lighter areas are caused by rising hotter material while the outer ring is caused by cooler (relatively) material descending.

Each of these granulation-cells is typically 1.500km in diameter and lasts 8 to 20 minutes before dissipating. A scaled image of Earth has been added for size reference.

The image was obtained using a Celestron 9.25” XLT with a full aperture Baader photographic solar filter, 2x PowerMate (for a focallength of 4700mm), Solar Continuum filter and a PointGrey Grashopper GS3-U328S4M camera. Everything mounted on a SkyWatcher EQ-6 AZ and autoguided with a Hinode Solar Guider.

Stack of sharpest 240 images out of 1200 obtained with an exposure time of 13ms and 26 fps.

The raw recording can be viewed here: https://youtu.be/ZJdBgTOncDk

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Histogram

Solar granulation on August 22th 2015, Arne Danielsen