Spatial and Temporal Thermospheric Density Effects as Reflected in Variability of the Ionosphere

Details Spatial and Temporal Thermospheric Density Effects as Reflected in Variability of the Ionosphere Spatial and Temporal Thermospheric Density Effects as Reflected in Variability of the Ionosphere

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa52c02r&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SA52C-02 INVITED

Physics

0355 Thermosphere--Composition And Chemistry, 0358 Thermosphere--Energy Deposition, 2443 Midlatitude Ionosphere, 2447 Modeling And Forecasting

Scientific paper

The mass spectrometer and incoherent scatter (MSIS) model neutral atmosphere is a key input to many ionosphere models such as the field line interhemispheric plasma (FLIP) model. This paper examines how well the FLIP model is able to reproduce the diurnal, solar cycle, and seasonal variations in the peak density of the ionosphere (NmF2) while using the MSIS model for the thermospheric neutral densities. We review results from some earlier comparisons of the FLIP model with ionosonde and radar data. In addition, we present some recent results of comparisons of multi-year runs of the FLIP model with data from ionosonde stations located in Australia, North and South America, Japan, and Europe. There are 3 key geophysical inputs to ionospheric models 1) the neutral atmosphere, 2) the neutral winds, and 3) the solar EUV flux. The FLIP model minimizes possible errors in the neutral winds and EUV flux by using the measured hmF2 as a proxy for the winds and the EUVAC solar flux model, which is based on solar EUV fluxes measured by the Atmosphere Explorer-E satellite during 1976-1980. With these constraints on the winds and EUV fluxes, the MSIS model neutral densities allow the FLIP model to reproduce the Northern Hemisphere NmF2 behavior quite well most of the time, including the winter NmF2 being larger than the summer NmF2 and the observation that NmF2 peaks at the equinoxes. The Southern Hemisphere NmF2 is also reasonably well modeled, but there are some noted failures, which indicates that some fine-tuning of the MSIS or FLIP models may be needed.

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