High-latitude ionospheric current inferred from space- versus ground-based magnetometers

Details High-latitude ionospheric current inferred from space- versus ground-based magnetometers High-latitude ionospheric current inferred from space- versus ground-based magnetometers

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa43b..09m&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA43B-09

Physics

[1910] Informatics / Data Assimilation, Integration And Fusion, [7904] Space Weather / Geomagnetically Induced Currents

Scientific paper

The high-latitude ionospheric current is a key parameter that describes the magnetosphere-ionospheric coupling and the electromagnetic energy transfer from the magnetosphere into the polar upper atmosphere. Inference of the ionospheric current system from magnetometers alone often relies on a number of assumptions regarding a current geometry and neutral wind effects as well as the Pedersen and Hall conductivity. In this paper we contrast the ionospheric current system inferred from the space-based magnetometers, on board DMSP satellites and Iridium satellites facilitated by AMPERE, to the one obtained from the global network of ground-based magnetometers. These two inferred current systems do not necessarily agree. For instance, the ground magnetometer response is produced by the divergence-free component of the total currents that can be assumed to be the Hall current especially when there is no conductivity gradient, while the space-based magnetometers are more sensitive to field-aligned-currents that are usually closed with the Pedersen current. We discuss how the inconsistency of the ionospheric currents inferred from ground- and space-based magnetometers can be reconciled by revising some of the assumptions often made in inverse methods for ionospheric electrodynamics.

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