Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa21a..02r&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA21A-02
Physics
2435 Ionospheric Disturbances, 2443 Midlatitude Ionosphere, 2447 Modeling And Forecasting, 2467 Plasma Temperature And Density
Scientific paper
The field line interhemispheric plasma (FLIP) model has been compared with ionosonde and AE-C satellite ion measurements during both quiet and disturbed periods in September 1974 when the satellite was in an elliptical orbit with perigee over Australia. These comparisons yield two important results, 1) the observed changes in F-region O and N2 neutral densities may not be sufficient, to account for changes in ion densities during magnetic storms, and 2) even on disturbed days, the O and N2 density profiles appear to closely follow hydrostatic equilibrium in the F-region. On magnetically quiet days, the FLIP model reproduces the ionosonde peak electron density (NmF2) and satellite measured O+, NO+, O2+ densities very well. The FLIP model neutral densities are supplied by the mass spectrometer and incoherent scatter (MSIS) model, which accurately reproduces the thermospheric neutral densities during quiet periods. During magnetic storms however, the FLIP model does not reproduce the ionosonde NmF2 and satellite ion densities. A major reason for the failure of the FLIP models lies in the MSIS neutral densities. The satellite observations show that the F-region atomic oxygen density is reduced by up to a factor of 2 on disturbed days while the MSIS model actually gives an increase. However, even after the observed O and N2 neutral densities were inserted into the FLIP model, it still overestimated the observed O+ density by up to a factor of 2 during magnetic storms.
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