Response of the Equatorial Ionosphere to Major Magnetic Storms During the Current Solar Maximum Phase

Details Response of the Equatorial Ionosphere to Major Magnetic Storms During the Current Solar Maximum Phase Response of the Equatorial Ionosphere to Major Magnetic Storms During the Current Solar Maximum Phase

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa21a..13b&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA21A-13

Physics

2415 Equatorial Ionosphere, 2439 Ionospheric Irregularities

Scientific paper

The generalized response of the equatorial ionosphere to major magnetic storms is discussed in the context of recently observed storm induced effects on VHF/UHF scintillation, total electron content (TEC) of the ionosphere and satellite insitu measurements of ion density and ion drifts. The scintillation data are obtained from AFRL's network of ground stations that monitor geostationary satellite signals and TEC and TEC fluctuation data are from the global network of the International Geodynamic Service that monitors GPS satellites. The satellite insitu measurements of ion density and ion drifts are obtained from DMSP and the Republic of China Satellite-1 (ROCSAT-1). It is found that prompt penetration of eastward electric field leading to a destabilization of ionospheric plasma in the equatorial region occurs over a longitude sector for which the early evening period corresponds to the time of rapid SYM-H (1-min resolution Dst) variations. A few examples of such longitudinally confined response are given for storms with different times of rapid SYM-H variations. It is shown that at some longitudes the eastward electric field can be intense enough to cause total plasma depletions dur to large upward plasma drift and field aligned plasma diffusion. It is also observed that IMF Bz northward turning and ionospheric disturbance dynamo can lead to fresh irregularity generation in the post-midnight period.

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