          APOD: 2017 September 9 - Calm Waters and Geomagnetic Storm

                         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 9
                                      [2]
                      Calm Waters and Geomagnetic Storm
                Image Credit & Copyright [3] : Chris Cook [4]

Explanation: Very recognizable [5]  stars of the northern sky are a backdrop
for calm waters in this moonlit sea and skyscape off Cape Cod, Massachusetts.
Taken on September 7 [6] , the photo also records a colorful display of
northern lights or aurora borealis [7]  triggered by a severe geomagnetic
storm. Visible crossing the Sun [8] , the giant solar active region
responsible, AR 2673, is much larger than planet Earth. It has produced [9]
the strongest flare of the current solar cycle and and the Earth-directed
coronal mass ejection in the last few days [10] .

                  Tomorrow's picture: swirling eyewall [11]

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    Authors & editors: Robert Nemiroff [23] (MTU [24] ) & Jerry Bonnell [25]
                                  (UMCP [26] )
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Site notes:
  [1] archivepix.html
  [2] image/1709/aurora-boat-090717ChrisCook.jpg
  [3] lib/about_apod.html#srapply
  [4] http://www.cookphoto.com
  [5] ap130421.html
  [6] http://www.abmedia.com/astro/current/aurora-boat-090717.html
  [7] http://spaceweathergallery.com/aurora_gallery.html
  [8] https://astrobob.areavoices.com/2017/09/04/
grab-those-eclipse-glasses-see-these-giant-sunspots/
  [9] https://www.nasa.gov/feature/goddard/2017/
active-region-on-sun-continues-to-emits-solar-flares
  [10] https://svs.gsfc.nasa.gov/12706
  [11] ap170910.html
  [12] ap170908.html
  [13] archivepix.html
  [14] lib/apsubmit2015.html
  [15] lib/aptree.html
  [16] http://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [17] calendar/allyears.html
  [18] /apod.rss
  [19] lib/edlinks.html
  [20] lib/about_apod.html
  [21] http://asterisk.apod.com/discuss_apod.php?date=170909
  [22] ap170910.html
  [23] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [24] http://www.phy.mtu.edu/
  [25] http://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [26] http://www.astro.umd.edu/
  [27] lib/about_apod.html#srapply
  [28] http://www.nasa.gov/about/highlights/HP_Privacy.html
  [29] http://astrophysics.gsfc.nasa.gov/
  [30] http://www.nasa.gov/
  [31] http://www.nasa.gov/centers/goddard/
  [32] http://www.mtu.edu/
