            APOD: 2018 April 30 - Total Solar Eclipse Corona in HDF

                         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.

                                2018 April 30
                                      [2]
                      Total Solar Eclipse Corona in HDF
             Image Credit & Copyright [3] : Nicolas Lefaudeux [4]

Explanation: How great was the Great American Eclipse [5] ? The featured HDR
image [6]  shows it to be perhaps greater than we knew. On August 21 of last
year, the Moon [7] blocked the Sun [8] for a few minutes along a narrow path
[9]  across the USA. Although one of the most photographed events [10]  in
human history, this image -- only recently completed after an extraordinary
amount of digital processing [11]  -- shows one of the most detailed depiction
[12] s of a solar corona ever taken. Composed of extremely hot gas [13] , the
solar corona [14]  is only visible to the unaided eye during a total solar
eclipse. The featured image combined over 70 images of different time
exposures. The series of complementary HDR [15]  images recovered enough
detail to see motion of the solar corona [16] . The images were taken in
Unity, Oregon [17]  in the morning to get steady atmospheric seeing
conditions. The next total solar eclipse [18]  visible on Earth will be in
2019 July, while the next one visible across North America and the USA will
occur in 2024 April [19] .

                    Tomorrow's picture: aurora sunrise [20]

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    Authors & editors: Robert Nemiroff [32] (MTU [33] ) & Jerry Bonnell [34]
                                  (UMCP [35] )
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Site notes:
  [1] archivepix.html
  [2] image/1804/AmericanEclipseHDR_Lefaudeux_3474.jpg
  [3] https://hdr-astrophotography.com/copyright/
  [4] https://hdr-astrophotography.com/a-propos/
  [5] https://eclipse2017.nasa.gov/eclipse-who-what-where-when-and-how
  [6] https://hdr-astrophotography.com/2017-total-solar-eclipse/
  [7] https://solarsystem.nasa.gov/moons/earths-moon/overview/
  [8] https://solarsystem.nasa.gov/solar-system/sun/in-depth/
  [9] ap160821.html
  [10] ap170912.html
  [11] https://i.pinimg.com/564x/9d/58/c3/9d58c3323ade2ae1899ea8bd526a4f7c.jpg
  [12] ap170813.html
  [13] https://en.wikipedia.org/wiki/Plasma_(physics)
  [14] https://eclipse2017.nasa.gov/solar-corona
  [15] https://en.wikipedia.org/wiki/High_dynamic_range
  [16]
https://hdrastrophotography.files.wordpress.com/2018/04/
anim_okcloseups_gif_generation.gif
  [17] https://www.youtube.com/watch?v=PYDf9NuM0hs
  [18] https://www.timeanddate.com/eclipse/list.html
  [19]
https://eclipse.gsfc.nasa.gov/SEgoogle/SEgoogle2001/SE2024Apr08Tgoogle.html
  [20] ap180501.html
  [21] ap180429.html
  [22] archivepix.html
  [23] lib/apsubmit2015.html
  [24] lib/aptree.html
  [25] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [26] calendar/allyears.html
  [27] /apod.rss
  [28] lib/edlinks.html
  [29] lib/about_apod.html
  [30] http://asterisk.apod.com/discuss_apod.php?date=180430
  [31] ap180501.html
  [32] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [33] http://www.phy.mtu.edu/
  [34] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [35] http://www.astro.umd.edu/
  [36] lib/about_apod.html#srapply
  [37] https://www.nasa.gov/about/highlights/HP_Privacy.html
  [38] https://astrophysics.gsfc.nasa.gov/
  [39] https://www.nasa.gov/
  [40] https://www.nasa.gov/centers/goddard/
  [41] http://www.mtu.edu/
