Subj : Daily APOD Report To : All From : Ben Ritchey Date : Tue Jul 10 2018 10:18:03 APOD: 2018 July 10 - Noctilucent Clouds over Paris Fireworks 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 July 10 Noctilucent Clouds over Paris Fireworks Video Credit & Copyright: Jean-Luc Dauvergne [2] (Ciel et Espace [3] ); Explanation: It's northern noctilucent cloud season -- perhaps a time to celebrate! Composed of small ice crystals forming only during specific conditions in the upper atmosphere, noctilucent clouds [4] may become visible at sunset during late summer when illuminated by sunlight from below. Noctilucent clouds [5] are the highest clouds known [6] and now established to be polar mesospheric clouds [7] observed from the ground. Although observed with NASA's AIM satellite [8] since 2007, much about noctilucent clouds [9] remains unknown and so a topic of active research [10] . The featured time-lapse video [11] shows expansive and rippled noctilucent clouds [12] wafting over Paris [13] , France [14] , during a post-sunset fireworks celebration on Bastille Day [15] in 2009 July. This year, several locations [16] are already reporting [17] especially vivid display [18] s of noctilucent clouds. Tomorrow's picture: exploding star art [19] ------------------------------------------------------------------------------- < [20] | Archive [21] | Submissions [22] | Index [23] | Search [24] | Calendar [25] | RSS [26] | Education [27] | About APOD [28] | Discuss [29] | > [30] ------------------------------------------------------------------------------- Authors & editors: Robert Nemiroff [31] (MTU [32] ) & Jerry Bonnell [33] (UMCP [34] ) NASA Official: Phillip Newman Specific rights apply [35] . NASA Web Privacy Policy and Important Notices [36] A service of: ASD [37] at NASA [38] / GSFC [39] & Michigan Tech. U. [40] ---------- Site notes: [1] archivepix.html [2] mailto: jl.dauvergne at cieletespace.fr [3] http://cieletespace.fr/ [4] ap090711.html [5] https://en.wikipedia.org/wiki/Noctilucent_cloud [6] https://weather.com/science/weather-explainers/news/ 2018-06-28-noctilucent-clouds-earth-highest-clouds-view-northern [7] https://en.wikipedia.org/wiki/Polar_mesospheric_clouds [8] http://aim.hamptonu.edu/ [9] http://science.nasa.gov/science-news/science-at-nasa/2003/19feb_nlc/ [10] http://adsabs.harvard.edu/abs/2017JASTP.162..116V [11] https://www.youtube.com/watch?v=FB4IzOiaXPs [12] https://www.livescience.com/44815-night-shining-clouds-become-more-common.html [13] https://www.youtube.com/watch?v=YPMOce2VdKQ [14] https://en.wikipedia.org/wiki/France [15] https://en.wikipedia.org/wiki/Bastille_Day [16] http://spaceweathergallery.com/nlc_gallery.html [17] ap180707.html [18] ap140731.html [19] ap180711.html [20] ap180709.html [21] archivepix.html [22] lib/apsubmit2015.html [23] lib/aptree.html [24] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search [25] calendar/allyears.html [26] /apod.rss [27] lib/edlinks.html [28] lib/about_apod.html [29] http://asterisk.apod.com/discuss_apod.php?date=180710 [30] ap180711.html [31] http://www.phy.mtu.edu/faculty/Nemiroff.html [32] http://www.phy.mtu.edu/ [33] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html [34] http://www.astro.umd.edu/ [35] lib/about_apod.html#srapply [36] https://www.nasa.gov/about/highlights/HP_Privacy.html [37] https://astrophysics.gsfc.nasa.gov/ [38] https://www.nasa.gov/ [39] https://www.nasa.gov/centers/goddard/ [40] http://www.mtu.edu/ --- Mystic BBS v1.12 A39 (Windows/32) * Origin: FIDONet - The Positronium Repository (1:393/68) .