• Telescope: Stellarvue SVA130T-IS
• Mount: Losmandy G-11 with Gemini 2 controller
• Autoguiding: No
• Optical Configuration: 0.72x field flattener & reducer (f/5); no solar filter during totality
• Camera: Canon 60Da
• Light Frame(s): Single, 1/500-sec exposure
• Calibration: None (no darks, no flats, no biases)
• Exposure Time: 1/500 sec
• ISO: 100
• Processing: Photoshop CC
• Imaging Location: Prairie City, Ore.

During the totality phase of a total solar eclipse, prominences sometimes can be seen along the limb of the sun. The image above shows three such prominences that appeared during the 2017 solar eclipse (The Great American Eclipse).

Prominences consist of a hot, dense plasma that typically follows magnetic field lines, arcing thousands of miles above the sun’s surface (photosphere).