Relationship Between ion Motions and Equatorial Ionization Anomaly Observed by ROCSAT-1 at 600 km Altitude

Details Relationship Between ion Motions and Equatorial Ionization Anomaly Observed by ROCSAT-1 at 600 km Altitude Relationship Between ion Motions and Equatorial Ionization Anomaly Observed by ROCSAT-1 at 600 km Altitude

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa52a0408y&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA52A-0408

Physics

2411 Electric Fields (2712), 2415 Equatorial Ionosphere, 2437 Ionospheric Dynamics

Scientific paper

Due to the unique 35-degree orbital inclination of ROCSAT-1 and the 100% duty-cycle operation of the Ionospheric Plasma and Electrodynamics Instrument (IPEI), the ROCSAT-IPEI has collected a large set of ion density and velocity data over the equatorial ionization anomaly (EIA) regions during the passing solar maximum years. The statistical patterns of ion density and drift velocity are derived for the quiet (Kp < 3) days of year 2000 and presented in this report. Strong correlation between the two parameters is found in their dependencies on local time, latitude, and longitude. The coincidence of upward ExB drift with density trough near the magnetic equator and the coincidence of poleward field-aligned drifts with density crests away from the magnetic equator strongly reflect the picture of fountain effect which drives the EIA phenomenon. In addition, we found that the degree of north-south asymmetry in the location and magnitude of the EIA crests varies with the field-aligned ion drifts which in terms depend on season and magnetic field declination. This suggests the importance of the coupling between neutral wind and ion drift in structuring the EIA region.

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