Physics
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3600c03h&link_type=abstract
Geophysical Research Letters, Volume 36, CiteID L00C03
Physics
22
Ionosphere: Equatorial Ionosphere, Ionosphere: Ion Chemistry And Composition (0335), Ionosphere: Topside Ionosphere
Scientific paper
Typically the solar radio emission at 10.7 cm is used to scale the critical euv radiation that is absorbed by the Earth's neutral atmosphere. In the latter half of 2008 this radio emission from the Sun was at the lowest levels seen in the last 50 years and the persistence of these low levels has never been recorded before. Here we show that these uniquely low levels of solar radiation produce similarly unique behavior in the Earth's ionosphere and the upper atmosphere. Most remarkably, the altitude extent of the ionosphere is significantly smaller than our present reference models would predict for these levels of solar activity. The transition height resides near 450 km at night and rises to only 850 km during the daytime. At night, this unusually contracted ionospheric shell around the equator has a temperature of only 600 K and prior to sunrise the ion number densities at the transition height fall below 104 cm-3.
Burrell A. G.
Coley William R.
Earle Gregory D.
Hairston Marc R.
Harmon L. L.
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