Credit & Copyright: Michael Dolan
(Michigan Tech.)
Explanation:
Looking out over
Lake Superior at dusk you see
Venus (lower left) and ...
curtains? Like an
ant
looking up at
window
curtains,
aurora
frequently appear as huge flowing light displays. These colorful,
often
spectacular phenomena are most frequently visible from locations near the
Earth's poles.
Aurora are caused by
electrons from the
solar wind
funneling to Earth along magnetic field lines,
and striking atoms and molecules in our atmosphere.
Auroral
color is determined by which atmospheric ions are struck and
recombine to form neutral atoms.
Hourly
updates of auroral sightings are posted to the WWW.
It is still controversial whether aurora make any sound audible from the
ground. If you think you have "heard an aurora,"
please report
it!
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
Январь Февраль Март Апрель Май Июнь Июль Август Сентябрь Октябрь Ноябрь Декабрь |
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day
|
Публикации с ключевыми словами:
полярное сияние - Солнечный ветер - магнитное поле
Публикации со словами: полярное сияние - Солнечный ветер - магнитное поле | |
См. также:
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