                   APOD: 2017 September 20 - The Big Corona

                         Astronomy Picture of the Day

    Discover the cosmos! [1] Each day a different image or photograph of our
 fascinating universe is featured, along with a brief explanation written by a
                           professional astronomer.

                              2017 September 20
                                      [2]
                                The Big Corona
                   Image Credit & Copyright: Alson Wong [3]

Explanation: Most photographs don't adequately portray the magnificence of the
Sun [4] 's corona. Seeing the corona [5]  first-hand during a total solar
eclipse [6]  is unparalleled [7] . The human eye [8] can adapt to see coronal
features [9]  and extent [10]  that average cameras usually cannot. Welcome,
however, to the digital [11]  age. The featured picture is a combination of
forty exposures from one thousandth of a second to two seconds that, together,
were digitally combined [12]  and processed to highlight faint features of the
total solar eclipse [13]  that occurred in August of 2017 [14] . Clearly
visible are intricate layers [15]  and glowing caustics of an ever changing
mixture of hot gas and magnetic fields [16]  in the Sun's corona. Looping
prominences [17]  appear bright pink just past the Sun's limb [18] . Faint
details on the night side of the New Moon [19]  can even be made out,
illuminated by sunlight reflected from the dayside of the Full Earth [20] .

                      Tomorrow's picture: open space [21]

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    Authors & editors: Robert Nemiroff [33] (MTU [34] ) & Jerry Bonnell [35]
                                  (UMCP [36] )
          NASA Official:  Phillip Newman Specific rights apply [37] .
              NASA Web Privacy Policy and Important Notices [38]
              A service of: ASD [39]  at NASA [40]  / GSFC [41]
                           & Michigan Tech. U. [42]
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Site notes:
  [1] archivepix.html
  [2] image/1709/Corona_Wong_5156.jpg
  [3] http://www.alsonwongastro.com/
  [4] https://solarsystem.nasa.gov/planets/sun
  [5] http://www.lmsal.com/YPOP/Spotlight/Tour/corona2.html
  [6] http://en.wikipedia.org/wiki/Total_solar_eclipse
  [7] ap170912.html
  [8] http://iknow.net/phys_eye_education.html
  [9] ap170813.html
  [10] ap160412.html
  [11] ap060620.html
  [12] ap170830.html
  [13] https://eclipse2017.nasa.gov/
  [14] ap170822.html
  [15]
https://oxyfresh.com/wp-content/uploads/2016/09/
oxyfresh-pets-cat-sleeping-eachother.jpg
  [16] https://www.nasa.gov/feature/goddard/2016/understanding-the-magnetic-sun
  [17] ap090531.html
  [18] ap020222.html
  [19] https://starchild.gsfc.nasa.gov/docs/StarChild/questions/question3.html
  [20] ap170831.html
  [21] ap170921.html
  [22] ap170919.html
  [23] archivepix.html
  [24] lib/apsubmit2015.html
  [25] lib/aptree.html
  [26] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [27] calendar/allyears.html
  [28] /apod.rss
  [29] lib/edlinks.html
  [30] lib/about_apod.html
  [31] http://asterisk.apod.com/discuss_apod.php?date=170920
  [32] ap170921.html
  [33] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [34] http://www.phy.mtu.edu/
  [35] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [36] http://www.astro.umd.edu/
  [37] lib/about_apod.html#srapply
  [38] https://www.nasa.gov/about/highlights/HP_Privacy.html
  [39] https://astrophysics.gsfc.nasa.gov/
  [40] https://www.nasa.gov/
  [41] https://www.nasa.gov/centers/goddard/
  [42] http://www.mtu.edu/
