January 7, 2025
If the universe seems cold from a distance, birthdays are part of its rebuttal.
A New Year's Aurora and SAR Arc
Birthday · January 7, 2025
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APOD published January 7, 2025. Credit: Alessandra Masi. A publication-date match, not a photo taken on your date. Independent of NASA.
It was a new year, and the sky was doubly red. The new year meant that the Earth had returned to its usual place in its orbit on January 1, a place a few days before its closest approach to the Sun. The first of the two red skyglows, on the left, was a red aurora, complete with vertical rays, caused by a blast from the Sun pushing charged particles into Earth's atmosphere. The second red glow, most prominent on the far right, was possibly a SAR arc caused by a river of charged particles flowing across Earth's atmosphere. Although both appear red, the slight color difference is likely due to the aurora being emitted by both oxygen and nitrogen, whereas the higher SAR arc was possibly emitted more purely by atmospheric oxygen. The featured image was taken on January 1 from near Pieve di Cadore in Italy. Portal Universe: Random APOD Generator
Image credit: Alessandra Masi