A section of the solar disc in H-alpha light with a grainy surface and a long dark filament on the left.
The Sun with a dark filament · © Martin Hudec

Sun, Moon & planets

The Sun with a dark filament

A dark thread of gas above the Sun's surface.

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About the object

Dark filaments are clouds of cooler, denser gas held high above the Sun's surface by magnetic fields. Seen side-on at the edge of the disc, they appear as bright prominences.

How the image was made

Processing
ImPPG, Adobe Lightroom (from file name and metadata)

Data from the original file’s metadata or from the author.