Realistic, Low Latitude, F Region Vertical ExB Drifts Obtained From Magnetometer Observations

Details Realistic, Low Latitude, F Region Vertical ExB Drifts Obtained From Magnetometer Observations Realistic, Low Latitude, F Region Vertical ExB Drifts Obtained From Magnetometer Observations

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa21a0422a&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA21A-0422

Mathematics

Logic

2411 Electric Fields (2712), 2415 Equatorial Ionosphere, 2437 Ionospheric Dynamics, 2447 Modeling And Forecasting

Scientific paper

The Ionospheric Forecast Model (IFM) will soon be operational at the Air Force Weather Agency (AFWA), Offutt AFB, Nebraska. IFM is a theoretically based model that calculates ion and electron densities as a function of altitude, latitude and local time, globally, in near real-time. The University Partnership for Operational Support (UPOS) has recently funded a study to demonstrate that the use of magnetometer-inferred ExB drift values as an input to IFM is significantly superior to the climatological drifts in specifying the low latitude F region ionosphere in the South American sector, day-to-day. The validation of this procedure compares observations from the Jicamarca Digisonde on the magnetic equator with the calculated ionospheric parameter, Nmax, from IFM. In addition, the calculated values of Total Electron Content (TEC) from IFM are compared with a network of ground-based GPS dual frequency receiver observations of TEC in the South American sector to demonstrate the improvement in ionospheric specification within +/- 35 degrees dip latitude of the magnetic equator. It is found that when realistic ExB drifts are incorporated into IFM rather than a climatological ExB drift pattern, the RMS error between calculated and observed Nmax values at the magnetic equator is significantly reduced. - From 22% to 12%. The results of this study will be presented in detail.

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