          APOD: 2017 September 27 - Layers of a Total Solar Eclipse

                         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 27
                                      [2]
                       Layers of a Total Solar Eclipse
  Image Credit: Inside:  Solar Dynamics Observatory, LMSAL and NASA's GSFC;
 Middle:  Jay Pasachoff, Ron Dantowitz, and the Williams College Solar Eclipse
                      Expedition/NSF/National Geographic;
                  Outside:  LASCO from NRL on SOHO from ESA

Explanation: Neither rain, nor snow, nor dark of night can keep a space-based
spacecraft from watching the Sun [3] . In fact, from its vantage point 1.5
million kilometers sunward of planet Earth, NASA's SOlar Heliospheric
Observatory [4]  (SOHO) can always monitor [5]  the Sun's outer atmosphere, or
corona [6] . But only during a total solar eclipse [7]  can Earth-based
observers also see the lovely coronal streamers and structures [8]  - when the
Moon briefly blocks the overwhelmingly bright solar surface. Then, it becomes
possible to follow detailed coronal activity [9]  all the way down to the
Sun's surface. In the outside layer of this composite image, SOHO's
uninterrupted view of the solar corona [10]  during last month's eclipse [11]
is shown in orange hues. The middle, donut-shaped region is the corona [12] as
recorded by the Williams College Eclipse Expedition [13]  to Salem, Oregon
[14] . Simultaneously, the inner view is from NASA's Earth-orbiting Solar
Dynamics Observatory [15] , which, being outside [16]  of totality, was able
to image the face of the Sun in extreme ultraviolet [17]  light, shown in
gold.

                      Tomorrow's picture: open space [18]

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    Authors & editors: Robert Nemiroff [30] (MTU [31] ) & Jerry Bonnell [32]
                                  (UMCP [33] )
          NASA Official:  Phillip Newman Specific rights apply [34] .
              NASA Web Privacy Policy and Important Notices [35]
              A service of: ASD [36]  at NASA [37]  / GSFC [38]
                           & Michigan Tech. U. [39]
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Site notes:
  [1] archivepix.html
  [2] image/1709/CoronaMatchup_Pasachoff_1024.jpg
  [3] ap051201.html
  [4] https://sohowww.nascom.nasa.gov/about/about.html
  [5] https://sohowww.nascom.nasa.gov/data/realtime-images.html
  [6] https://en.wikipedia.org/wiki/Corona
  [7] https://eclipse2017.nasa.gov/eclipse-who-what-where-when-and-how
  [8] ap170813.html
  [9] ap170920.html
  [10] https://solarscience.msfc.nasa.gov/corona.shtml
  [11] https://eclipse2017.nasa.gov/
  [12] http://www.phy6.org/Education/wcorona.html
  [13] http://sites.williams.edu/eclipse/2017-usa/
  [14] https://en.wikipedia.org/wiki/Salem,_Oregon
  [15] https://www.nasa.gov/mission_pages/sdo/main/index.html
  [16]
https://i.pinimg.com/originals/ec/b1/b7/ecb1b745b328ab2f14212afd0578f0b9.jpg
  [17] https://science.nasa.gov/ems/10_ultravioletwaves
  [18] ap170928.html
  [19] ap170926.html
  [20] archivepix.html
  [21] lib/apsubmit2015.html
  [22] lib/aptree.html
  [23] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [24] calendar/allyears.html
  [25] /apod.rss
  [26] lib/edlinks.html
  [27] lib/about_apod.html
  [28] http://asterisk.apod.com/discuss_apod.php?date=170927
  [29] ap170928.html
  [30] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [31] http://www.phy.mtu.edu/
  [32] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [33] http://www.astro.umd.edu/
  [34] lib/about_apod.html#srapply
  [35] https://www.nasa.gov/about/highlights/HP_Privacy.html
  [36] https://astrophysics.gsfc.nasa.gov/
  [37] https://www.nasa.gov/
  [38] https://www.nasa.gov/centers/goddard/
  [39] http://www.mtu.edu/
