The Global Ionosphere During the April 17 to 20, 2002 Magnetic Storm

Details The Global Ionosphere During the April 17 to 20, 2002 Magnetic Storm The Global Ionosphere During the April 17 to 20, 2002 Magnetic Storm

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa12a..10d&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA12A-10

Physics

0355 Thermosphere: Composition And Chemistry, 2400 Ionosphere, 2415 Equatorial Ionosphere

Scientific paper

The structure of the global ionosphere during the April 17 to 20, 2002 magnetic storm is investigated using a number of simulation techniques. The observations show that the daytime densities were reduced by a factor of 3 for three consecutive days within the continental US. Although they are in the same longitude sector, the East and West coasts of the US show differing patterns. The Northern and Southern hemisphere also behave differently, in spite of the fact that the storm is close to equinox. During most of the storm period, the Equatorial Appleton anomaly is reduced, both in strength and in width. The ionospheric assimilative model called PRISM was used to estimate the profiles of ionospheric density throughout the globe during the April 2002 magnetic storm. The inputs to PRISM are vertical Total Electron Content (TEC), F-region Maximum density and height, as well as DMSP data such as high-latitude particles and auroral boundaries. TIEGCM simulations of the ionosphere for these days were performed. We compare the output from the assimilative model with that from the TIEGCM simulation in order to explain the reasons for the agreements and disagreements between the theoretical simulation model, and the ionospheric assimilation model. To explain the behavior of the Equatorial anomaly, we examine the electrodynamics in the low-latitude region for the event.

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