Monday, September 2, 2024

APOD - A Triangular Prominence Hovers Over the Sun

Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2024 September 2
The featured image shows the surface of the Sun   with a flowing texture in red light. Above the  Sun's surface an unusual triangular prominence hovers.   Please see the explanation for more detailed information.

A Triangular Prominence Hovers Over the Sun
Image Credit & Copyright: Andrea Vanoni

Explanation: Why is there a triangle hovering over the Sun? Although the shape is unusual, the type of structure is not: it is part of an evolving solar prominence. Looping magnetic fields on the Sun channel the flow of energetic particles, sometimes holding glowing gaseous structures aloft for months. A prominence glows brightly because it contains particularly hot, dense, or opaque solar plasma. The surprising triangular structure occurred last week. Larger than our Earth, the iconic prominence was imaged by several solar photographers and documented by NASA's Solar Dynamic Observatory to form and violently dissipate in about a day. The featured image was captured in a color of red light emitted strongly by hydrogen. Below, solar fibrils carpet the Sun's chromosphere, while the background sky is so faint in comparison that no stars are visible. Our Sun's surface has been quite active this year.

Tomorrow's picture: Moon sisters


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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
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& Michigan Tech. U.


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