Physics
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3615102h&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 15, CiteID L15102
Physics
9
Ionosphere: Ionospheric Dynamics, Ionosphere: Equatorial Ionosphere, Ionosphere: Plasma Temperature And Density, Ionosphere: Modeling And Forecasting
Scientific paper
The first simulation study of ion (O+ and H+) and electron temperature evolution during equatorial spread F (ESF) is presented. The simulation results are based on the Naval Research Laboratory (NRL) SAMI3/ESF three-dimensional code. It is found that the ions and electrons undergo both cooling and heating during bubble evolution. The main cause of cooling is adiabatic, associated with the increase of the flux tube volume as the plasma bubble rises. Ion heating is primarily caused by the compression of ions as they stream down the converging magnetic field. The electrons are heated by collisional coupling with the ions. Additionally, it is found that the electrons are heated at high altitudes ($\gtrsim$1200 km) because of thermal conduction, and that hydrogen ions can be heated at relatively low altitudes ($\simeq$300 km) because of ion-neutral frictional heating. We compare the simulation results with observations from the ROCSAT and Hinotori satellites.
Fedder J.
Huba Joseph D.
Joyce Geoffrey
Krall Jonathan
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