Article ID Journal Published Year Pages File Type
1777848 Journal of Atmospheric and Solar-Terrestrial Physics 2009 8 Pages PDF
Abstract

O+ field-aligned diffusive velocities and fluxes in the topside ionosphere have been calculated from electron density profiles retrieved from CHAMP radio occultation (RO) measurements. The velocities and fluxes from January 2002 to December 2003 at low- and mid-latitudes have been statistically analyzed. The results show that daytime diffusive fluxes changed gradually from downward to upward as altitude increases. The largest values of the upward diffusive fluxes and velocities occurred at around ±25° geomagnetic latitude. During solstices the plasma fluxes in the winter hemisphere were larger than those in the summer hemisphere.

Related Topics
Physical Sciences and Engineering Earth and Planetary Sciences Geophysics
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