Astronomy Picture of the Day [1]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. 2023 November 11 [2]See Explanation. Clicking on the picture will download the highest resolution version available. The SAR and the Milky Way Image Credit & [3]Copyright: [4]Julien Looten Explanation: This broad, [5]luminous red arc was a surprising visitor to partly cloudy evening skies over northern France. Captured extending toward the zenith in a [6]west-to-east mosaic of images from November 5, the faint atmospheric ribbon of light is an example of a Stable Auroral Red (SAR) arc. The rare [7]night sky phenomenon was also spotted at unusually low latitudes around world, along with more dynamic auroral displays during an [8]intense geomagnetic storm. SAR arcs and their relation to auroral emission have been [9]explored by citizen science and [10]satellite investigations. From altitudes substantially above the normal auroral glow, the deep red SAR emission is thought to be caused by strong heating due to currents flowing in planet Earth's inner [11]magnetosphere. Beyond this SAR, the Milky Way arcs above the cloud banks [12]along the horizon, a regular visitor to night skies over northern France. Tomorrow's picture: snow day __________________________________________________________________ [13]< | [14]Archive | [15]Submissions | [16]Index | [17]Search | [18]Calendar | [19]RSS | [20]Education | [21]About APOD | [22]Discuss | [23]> __________________________________________________________________ Authors & editors: [24]Robert Nemiroff ([25]MTU) & [26]Jerry Bonnell ([27]UMCP) NASA Official: Phillip Newman [28]Specific rights apply. [29]NASA Web Privacy Policy and Important Notices A service of: [30]ASD at [31]NASA / [32]GSFC, [33]NASA Science Activation & [34]Michigan Tech. U. References 1. https://apod.nasa.gov/apod/archivepix.html 2. https://apod.nasa.gov/apod/image/2311/SARarcLooten.jpg 3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 4. https://www.flickr.com/photos/julienlooten/ 5. https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2022GL098511 6. https://www.flickr.com/photos/julienlooten/53311294522/ 7. https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2022GL101205 8. https://spaceweather.com/archive.php?view=1&day=07&month=11&year=2023 9. https://eos.org/research-spotlights/from-sar-arc-to-steve-an-atmospheric-evolution 10. https://earth.esa.int/eogateway/missions/swarm 11. https://science.nasa.gov/science-research/planetary-science/earths-magnetosphere/ 12. https://apod.nasa.gov/apod/ap230927.html 13. https://apod.nasa.gov/apod/ap231110.html 14. https://apod.nasa.gov/apod/archivepix.html 15. https://apod.nasa.gov/apod/lib/apsubmit2015.html 16. https://apod.nasa.gov/apod/lib/aptree.html 17. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search 18. https://apod.nasa.gov/apod/calendar/allyears.html 19. https://apod.nasa.gov/apod.rss 20. https://apod.nasa.gov/apod/lib/edlinks.html 21. https://apod.nasa.gov/apod/lib/about_apod.html 22. http://asterisk.apod.com/discuss_apod.php?date=231111 23. https://apod.nasa.gov/apod/ap231112.html 24. http://www.phy.mtu.edu/faculty/Nemiroff.html 25. http://www.phy.mtu.edu/ 26. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html 27. http://www.astro.umd.edu/ 28. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 29. https://www.nasa.gov/about/highlights/HP_Privacy.html 30. https://astrophysics.gsfc.nasa.gov/ 31. https://www.nasa.gov/ 32. https://www.nasa.gov/centers/goddard/ 33. https://science.nasa.gov/learners 34. http://www.mtu.edu/