Statistical ion Drift Patterns in low Latitude Ionosphere From ROCSAT-1 During Equinoxes

Details Statistical ion Drift Patterns in low Latitude Ionosphere From ROCSAT-1 During Equinoxes Statistical ion Drift Patterns in low Latitude Ionosphere From ROCSAT-1 During Equinoxes

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa32a0668y&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA32A-0668

Physics

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

Scientific paper

We analyze the ROCSAT-1 Ionospheric Plasma and Electrodynamics Instrument (IPEI) data collected during the equinoxes between March 1999 and April 2001 to study the global characteristics of ionospheric ion flows under varying conditions of solar flux and geomagnetic activity. As ROCSAT-1 is a 35-degree inclined circular orbiting satellite at an altitude near 600 km, observations with global coverage in local time and longitude are available every 52 days. The two-year set of ion drift data from IPEI provides us good opportunity to validate the previously reported statistical features concerning the dependencies of ion drifts on local time, longitude, season and geomagnetic activity at equatorial latitudes. In addition, the ROCSAT-IPEI can provide, probably for the first time, a large set of ion velocity data over the equatorial ionization anomaly (EIA) regions (tropical latitudes). Combining the IGRF magnetic field model with the 3-orthogonal velocity components measured in the three IPEI sensors we are able to resolve the observed ion drifts into their ExB and field-aligned components. To take advantages of the ion velocity data set uniquely provided by ROCSAT-IPEI, the emphasis of this report will be on examining the longitudinal dependency, the differences between field-aligned and field-perpendicular patterns and the magnetic storm effects on the low latitude ionospheric ion drifts.

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