Determination of Ionospheric High-Latitude Drivers for GAIM Using DMSP Data

Details Determination of Ionospheric High-Latitude Drivers for GAIM Using DMSP Data Determination of Ionospheric High-Latitude Drivers for GAIM Using DMSP Data

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa32a0664b&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA32A-0664

Physics

2407 Auroral Ionosphere (2704), 2415 Equatorial Ionosphere, 2443 Midlatitude Ionosphere, 2447 Modeling And Forecasting

Scientific paper

In this paper, our recent work on the development of the high-latitude drivers for GAIM (Global Assimilation of Ionospheric Measurements) will be presented. GAIM will use a physics based ionosphere and plasmasphere model and a Kalman filter as a basis for assimilating a diverse set of real-time (or near real-time) measurements for the specification and forecast of the global ionosphere and plasmasphere Ne distribution. The Weimer convection model and Hardy precipitation model represent climatology for these drivers. These two models are modified to give a more realistic real-time or near real-time prediction for the convection pattern and electron precipitation in the high-latitude region. For the high latitude convection, we find the best fit between the Weimer patterns and in situ DMSP satellite ion drift measurements. First, the drift velocities along the satellite tracks are compared with the drift velocities predicted by the Weimer pattern corresponding to the actual IMF. Then, the input parameters to the Weimer model are varied to obtain the drift pattern that give the best agreement between the model drift velocities and the drift velocities measured along the satellite tracks. To obtain a more realistic Precipitation pattern, Vince Eccles developed an algorithm to combine energy flux measurements from four DMSP satellites with the Hardy pattern that was predicted from the model for the same conditions at the time of the measurement. The results of these two procedures and the effects of the modified patterns on the ionosphere will be presented.

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