Latitudinal Quiet Time Variations of Ion Drifts in the Ionosphere at Low- and Middle- Latitudes

Details Latitudinal Quiet Time Variations of Ion Drifts in the Ionosphere at Low- and Middle- Latitudes Latitudinal Quiet Time Variations of Ion Drifts in the Ionosphere at Low- and Middle- Latitudes

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa31b..05p&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SA31B-05

Physics

2400 Ionosphere (6929), 2415 Equatorial Ionosphere, 2443 Midlatitude Ionosphere, 2481 Topside Ionosphere

Scientific paper

There is limited knowledge of the latitudinal (apex-height) variability of ion drifts at low and middle latitudes. This study provides a global description of the ion drifts that are key elements for the understanding of the dynamics of the ionosphere and are important parameters for physics-based models. We use measurements from the ROCSAT-1 satellite for the years 2000-2003 and for altitudes near 600 km. Offsets in the original data are removed by considering separately the northbound and southbound passes, and enforcing conjugacy on the derivation of ion drifts perpendicular to the magnetic field. Our study investigates latitudinal, longitudinal and local time variations of ion drifts in the topside ionosphere for a geographic latitude range from - 25° to +25°. Specifically, we derive the ion drifts in the directions parallel and perpendicular to the magnetic field during quiet times defined when the Dst index is greater than -100 nT and the Kp index is equal to or less than 3. We then describe the longitude differences in latitude and local time profiles of the ion drifts.

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