High-Latitude Joule Heating Compared With Observed Global Neutral Density Response

Details High-Latitude Joule Heating Compared With Observed Global Neutral Density Response High-Latitude Joule Heating Compared With Observed Global Neutral Density Response

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa13b..04w&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA13B-04

Physics

2447 Modeling And Forecasting, 2736 Magnetosphere/Ionosphere Interactions, 0358 Thermosphere: Energy Deposition

Scientific paper

An empirical model of the high-latitude, ionospheric electric potentials has recently undergone substantial revision and improvement. This model, which can predict the electric fields in the ionosphere using only measurements of the solar wind and interplanetary magnetic field (IMF), has a "twin" model that is based on "magnetic Euler potentials." Although the original purpose of the magnetic potentials was to map the distribution of the field-aligned currents into the ionosphere, it can be combined with the electric field predictions in order to calculate the distribution of Joule heating in the ionosphere. Thus, we can calculate the total Joule heat energy input to the ionosphere as a function of time. This energy, which is transferred from the solar wind through the magnetosphere and ionosphere into the thermosphere, increases substantially during geomagnetic storms. Comparing our results with output from the High Accuracy Satellite Drag Model (HASDM), we show that during major storms the Joule heating is a major source of day-long enhancements in the global thermospheric neutral density.

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