Credit & Copyright: Frank Andreassen (nettfoto.no)
Explanation:
What causes gaps between aurora curtains?
These unusual gaps can make
Research using data from four
Cluster spacecraft orbiting the Earth has likely found the secret:
auroral gaps, sometimes knows as black auroras, are actually anti-auroras.
In normal auroras,
electrons and/or predominantly negatively charged
particles fall toward Earth along surfaces of constant
magnetic field.
They ionize the
Earth's atmosphere on impact, causing the bright glows.
In auroral gaps, however, negatively charged particles may be sucked out
from the Earth's
ionosphere
along adjoining
magnetic field lines.
These
dark anti-auroras can climb to over 20,000 kilometers
and last for several minutes.
Pictured above, a series of well-defined
auroral gaps is seen dividing green aurora curtains high above
Harstad,
Norway, earlier this month.
News: Solar Eclipse Today
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 |
Yanvar' Fevral' Mart Aprel' Mai Iyun' Iyul' Avgust Sentyabr' Oktyabr' Noyabr' Dekabr' |
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
|
Publikacii s klyuchevymi slovami:
aurora - black aurora - severnoe siyanie - polyarnoe siyanie - chernoe polyarnoe siyanie
Publikacii so slovami: aurora - black aurora - severnoe siyanie - polyarnoe siyanie - chernoe polyarnoe siyanie | |
Sm. takzhe:
Vse publikacii na tu zhe temu >> | |
