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 July 2
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                     AR2835: Islands in the Photosphere
     Image Credit & [3]Copyright: [4]Michael Teoh, Heng Ee Observatory,
                              Penang, Malaysia

   Explanation: Awash in a sea of [5]incandescent plasma and anchored in
   strong [6]magnetic fields, sunspots are planet-sized dark islands in
   [7]the solar photosphere, the bright surface of the Sun. Found in solar
   active regions, sunspots look [8]dark only because they are slightly
   cooler though, with temperatures of about 4,000 [9]kelvins compared to
   6,000 kelvins for the surrounding solar surface. These sunspots lie in
   active region AR2835. The largest active region [10]now crossing the
   Sun, AR2835 is captured in this sharp telescopic close-up from July 1
   in a field of view that spans about 150,000 kilometers or over ten
   Earth diameters. With powerful magnetic fields, [11]solar active
   regions are often responsible for solar flares and coronal mass
   ejections, storms which affect [12]space weather near [13]planet Earth.

                     Tomorrow's picture: Got telescope?
     __________________________________________________________________

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    Authors & editors: [25]Robert Nemiroff ([26]MTU) & [27]Jerry Bonnell
                                 ([28]UMCP)
          NASA Official: Phillip Newman [29]Specific rights apply.
              [30]NASA Web Privacy Policy and Important Notices
                A service of: [31]ASD at [32]NASA / [33]GSFC
                           & [34]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2107/AR2835_20210701_W2x.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. https://earthsky.org/earthsky-community-photos/?filter_1_3=Michael&filter_1_6=Teoh&mode=all
   5. https://www.pbs.org/wgbh/nova/labs/lab/sun/
   6. https://svs.gsfc.nasa.gov/4623
   7. https://www.nasa.gov/mission_pages/iris/multimedia/layerzoo.html
   8. http://image.gsfc.nasa.gov/poetry/venus/q142.html
   9. https://en.wikipedia.org/wiki/Kelvin
  10. https://sdo.gsfc.nasa.gov/
  11. https://scied.ucar.edu/learning-zone/sun-space-weather/sun-active-region
  12. https://spaceplace.nasa.gov/spaceweather/en/
  13. https://www.spaceweather.com/
  14. https://apod.nasa.gov/apod/ap210701.html
  15. https://apod.nasa.gov/apod/archivepix.html
  16. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  17. https://apod.nasa.gov/apod/lib/aptree.html
  18. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  19. https://apod.nasa.gov/apod/calendar/allyears.html
  20. https://apod.nasa.gov/apod.rss
  21. https://apod.nasa.gov/apod/lib/edlinks.html
  22. https://apod.nasa.gov/apod/lib/about_apod.html
  23. http://asterisk.apod.com/discuss_apod.php?date=210702
  24. https://apod.nasa.gov/apod/ap210703.html
  25. http://www.phy.mtu.edu/faculty/Nemiroff.html
  26. http://www.phy.mtu.edu/
  27. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  28. http://www.astro.umd.edu/
  29. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  30. https://www.nasa.gov/about/highlights/HP_Privacy.html
  31. https://astrophysics.gsfc.nasa.gov/
  32. https://www.nasa.gov/
  33. https://www.nasa.gov/centers/goddard/
  34. http://www.mtu.edu/