¿ 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. 2021 May 5 [2]A picture of a STEVE arc over Copper Harbor, Michigan, with the Milky Way across the background. Please see the explanation for more detailed information. STEVE over Copper Harbor Image Credit & Copyright: [3]MaryBeth Kiczenski Explanation: What creates STEVEs? [4]Strong Thermal Emission Velocity Enhancements (STEVEs) have likely been seen since antiquity, but only in the past five years has it [5]been realized that their colors and shapes make them different from [6]auroras. Seen as single bright streaks of pink and purple, the origin of [7]STEVEs remain an active topic of research. [8]STEVEs may be related to [9]subauroral ion drifts (SAIDs), a supersonic river of hot atmospheric [10]ions. For reasons [11]currently unknown, [12]STEVEs are frequently accompanied by green [13]"picket-fence" auroras. The [14]featured STEVE image is a combination of foreground and background exposures taken consecutively in mid-March from [15]Copper Harbor, [16]Michigan, [17]USA. This bright STEVE lasted several minutes, spanned from horizon to horizon, and appeared in between times of [18]normal [19]auroras. Tomorrow's picture: open space __________________________________________________________________ [20]< | [21]Archive | [22]Submissions | [23]Index | [24]Search | [25]Calendar | [26]RSS | [27]Education | [28]About APOD | [29]Discuss | [30]> __________________________________________________________________ Authors & editors: [31]Robert Nemiroff ([32]MTU) & [33]Jerry Bonnell ([34]UMCP) NASA Official: Phillip Newman [35]Specific rights apply. [36]NASA Web Privacy Policy and Important Notices A service of: [37]ASD at [38]NASA / [39]GSFC & [40]Michigan Tech. U. References 1. https://apod.nasa.gov/apod/archivepix.html 2. https://apod.nasa.gov/apod/image/2105/SteveMichigan_Kiczenski_1378.jpg 3. https://www.shelbydiamondstar.com/emotional 4. https://en.wikipedia.org/wiki/Steve_(atmospheric_phenomenon) 5. https://eos.org/features/how-did-we-miss-this-an-upper-atmospheric-discovery-named-steve 6. https://apod.nasa.gov/apod/ap120209.html 7. http://www.esa.int/ESA_Multimedia/Images/2017/04/Meet_Steve 8. https://www.nasa.gov/feature/goddard/2020/citizen-scientists-help-discover-a-new-feature-of-steve 9. https://en.wikipedia.org/wiki/Subauroral_ion_drift 10. https://en.wikipedia.org/wiki/Ion 11. http://vignette1.wikia.nocookie.net/theevilliouschronicles/images/8/85/Confused-cat.jpg 12. https://ui.adsabs.harvard.edu/abs/2020AGUA....100183S/abstract 13. https://apod.nasa.gov/apod/ap080101.html 14. https://www.instagram.com/p/CNVsbC1nAb-/ 15. https://youtu.be/ZANojAWLoDY 16. https://en.wikipedia.org/wiki/Michigan 17. https://www.cia.gov/the-world-factbook/countries/united-states/ 18. https://apod.nasa.gov/apod/ap190714.html 19. https://apod.nasa.gov/apod/ap200531.html 20. https://apod.nasa.gov/apod/ap210504.html 21. https://apod.nasa.gov/apod/archivepix.html 22. https://apod.nasa.gov/apod/lib/apsubmit2015.html 23. https://apod.nasa.gov/apod/lib/aptree.html 24. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search 25. https://apod.nasa.gov/apod/calendar/allyears.html 26. https://apod.nasa.gov/apod.rss 27. https://apod.nasa.gov/apod/lib/edlinks.html 28. https://apod.nasa.gov/apod/lib/about_apod.html 29. http://asterisk.apod.com/discuss_apod.php?date=210505 30. https://apod.nasa.gov/apod/ap210506.html 31. http://www.phy.mtu.edu/faculty/Nemiroff.html 32. http://www.phy.mtu.edu/ 33. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html 34. http://www.astro.umd.edu/ 35. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 36. https://www.nasa.gov/about/highlights/HP_Privacy.html 37. https://astrophysics.gsfc.nasa.gov/ 38. https://www.nasa.gov/ 39. https://www.nasa.gov/centers/goddard/ 40. http://www.mtu.edu/