Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa74a..07g&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #SA74A-07
Physics
2415 Equatorial Ionosphere, 2443 Midlatitude Ionosphere, 2467 Plasma Temperature And Density, 3369 Thermospheric Dynamics (0358)
Scientific paper
We summarize ionospheric and thermospheric variations observed by the Millstone Hill incoherent scatter radar (42.6N, 288.5E) during stratospheric warmings of January 2008 and January 2009. Cooler ion temperature is observed in the F-region in January 2009, consistent with earlier reported observations of cooling during stratospheric warming in January 2008. The usual behavior of winter daytime electron density, dominated by TIDs with periods 1-1.5 hours, is replaced by a three-peak structure in electron density in January 2009. Plasma drift data indicate that this behavior is related to the vertical plasma motion, which in case of January 2009 data presents a mix of 8-10 hour waves with shorter (~2-3 hour) waves. Analysis of GPS TEC data indicates that variations in electron density are observed in a large range of longitudes and latitudes, with especially pronounced changes at low latitudes. We discuss what part of this variability could be associated with stratospheric conditions and what are the plausible mechanisms for such association.
Coster Anthea
Goncharenko Larisa
Zhang Sheng
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