Extremely Low Ionospheric Densities Observed During April 2002 Storm

Details Extremely Low Ionospheric Densities Observed During April 2002 Storm Extremely Low Ionospheric Densities Observed During April 2002 Storm

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa21b0459r&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA21B-0459

Other

2435 Ionospheric Disturbances, 2437 Ionospheric Dynamics, 2481 Topside Ionosphere, 2788 Storms And Substorms

Scientific paper

Ion densities, observed during the April 2002 geomagnetic storm by polar-orbiting DMSP satellites in the evening sector of the southern polar cap decreased by factors of 10 to 100 relative to their values equatorward of the mid-latitude trough. Comparisons of electric fields with magnetic perturbations due to field-aligned currents suggest that the conductivity of the lower ionosphere also dropped significantly. This implies that the unusually low density characterized the ionosphere at all altitudes beneath the spacecraft. We present DMSP plasma and field measurements to illustrate how the quiet-time polar ionosphere evolved toward the extraordinarily low-density state apparent during the April 2002 storm. Remotely sensed FUV emissions detected by optical sensors on the Polar and TIMED satellites indicate that wide-spread regions of low O/N2 ratios developed at southern high latitudes during this period of prolonged geomagnetic disturbance. Our analysis will assess the contributions of Joule heating, altered F-layer chemistry, plasma transport and solar-photon replenishment to the very low topside densities observed during the April 2002 magnetic storm, but not in other storms.

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