¿ 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. 2020 August 19 IFRAME: [2]https://www.youtube.com/embed/2WRgXvdasm0 The Sun Rotating Video Credit: [3]SDO, [4]NASA; Digital Composition: [5]Kevin M. Gill Explanation: Does the Sun change as it rotates? Yes, and the changes can vary from subtle to dramatic. In the [6]featured time-lapse sequences, our Sun -- as imaged by [7]NASA's [8]Solar Dynamics Observatory -- is shown rotating though an entire month in 2014. In the large image on the left, the solar [9]chromosphere is depicted in [10]ultraviolet light, while the smaller and lighter image to its upper right simultaneously shows the more familiar solar [11]photosphere in [12]visible light. The rest of the inset six Sun images highlight [13]X-ray emission by relatively rare iron atoms located at different heights of the [14]corona, all [15]false-colored to accentuate differences. The Sun takes just under a month to [16]rotate completely -- rotating fastest at the equator. A large and active [17]sunspot region rotates into view soon after the video starts. Subtle effects include changes in [18]surface texture and the shapes of active regions. Dramatic effects include numerous flashes in active regions, and fluttering and [19]erupting prominences visible all around the Sun's edge. Presently, [20]our Sun is passing an unusually low [21]Solar minimum in activity of its [22]11-year magnetic cycle. As the video ends, the same large and [23]active sunspot region previously mentioned rotates back into view, this time [24]looking different. Tomorrow's picture: open space __________________________________________________________________ [25]< | [26]Archive | [27]Submissions | [28]Index | [29]Search | [30]Calendar | [31]RSS | [32]Education | [33]About APOD | [34]Discuss | [35]> __________________________________________________________________ Authors & editors: [36]Robert Nemiroff ([37]MTU) & [38]Jerry Bonnell ([39]UMCP) NASA Official: Phillip Newman [40]Specific rights apply. [41]NASA Web Privacy Policy and Important Notices A service of: [42]ASD at [43]NASA / [44]GSFC & [45]Michigan Tech. U. References 1. https://apod.nasa.gov/apod/archivepix.html 2. https://www.youtube.com/embed/2WRgXvdasm0 3. http://sdo.gsfc.nasa.gov/ 4. http://www.nasa.gov/ 5. https://www.flickr.com/people/kevinmgill/ 6. https://www.youtube.com/watch?v=2WRgXvdasm0 7. https://www.nasa.gov/ 8. https://sdo.gsfc.nasa.gov/mission/ 9. https://solarscience.msfc.nasa.gov/chromos.shtml 10. https://science.nasa.gov/ems/10_ultravioletwaves 11. http://solarscience.msfc.nasa.gov/surface.shtml 12. https://science.nasa.gov/ems/09_visiblelight 13. https://science.nasa.gov/ems/11_xrays 14. https://apod.nasa.gov/apod/ap170920.html 15. https://ichef.bbci.co.uk/news/660/cpsprodpb/1B33/production/_105436960_blue1.jpg 16. https://en.wikipedia.org/wiki/Solar_rotation 17. https://apod.nasa.gov/apod/ap031027.html 18. https://apod.nasa.gov/apod/ap111106.html 19. https://apod.nasa.gov/apod/ap190526.html 20. https://solarsystem.nasa.gov/solar-system/sun/overview/ 21. https://apod.nasa.gov/apod/ap191028.html 22. https://www.nasa.gov/mission_pages/sunearth/solar-events-news/Does-the-Solar-Cycle-Affect-Earths-Climate.html 23. https://apod.nasa.gov/apod/ap141022.html 24. http://spaceweather.com/ 25. https://apod.nasa.gov/apod/ap200818.html 26. https://apod.nasa.gov/apod/archivepix.html 27. https://apod.nasa.gov/apod/lib/apsubmit2015.html 28. https://apod.nasa.gov/apod/lib/aptree.html 29. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search 30. https://apod.nasa.gov/apod/calendar/allyears.html 31. https://apod.nasa.gov/apod.rss 32. https://apod.nasa.gov/apod/lib/edlinks.html 33. https://apod.nasa.gov/apod/lib/about_apod.html 34. http://asterisk.apod.com/discuss_apod.php?date=200819 35. https://apod.nasa.gov/apod/ap200820.html 36. http://www.phy.mtu.edu/faculty/Nemiroff.html 37. http://www.phy.mtu.edu/ 38. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html 39. http://www.astro.umd.edu/ 40. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 41. https://www.nasa.gov/about/highlights/HP_Privacy.html 42. https://astrophysics.gsfc.nasa.gov/ 43. https://www.nasa.gov/ 44. https://www.nasa.gov/centers/goddard/ 45. http://www.mtu.edu/