Joule Heating in Small-Scale Aurora: Modeling

Details Joule Heating in Small-Scale Aurora: Modeling Joule Heating in Small-Scale Aurora: Modeling

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa23a0389s&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA23A-0389

Physics

2407 Auroral Ionosphere (2704), 2431 Ionosphere/Magnetosphere Interactions (2736), 2753 Numerical Modeling, 0310 Airglow And Aurora

Scientific paper

The coupling between the magnetosphere and the ionosphere is of major importance for the thermospheric and magnetospheric dynamics. Small-scale large magnitude electric fields associated with aurora can generate considerable Joule heating which is not present on large scale temporal and spatial averages. Presented is a simulation model which considers localized parallel electric fields as a source for discrete auroral dynamics. The evolution produces large electric field in the immediate vicinity of field-aligned current layers. We will discuss properties of the dynamics depending on ionospheric conditions. The Joule heating is determined over several scale averages. It is shown that as the scale averages are increased, a progressively lower value is obtained for the total Joule heating. This represents a mismeasurement.

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