Height-integrated Joule and particle heating rates determined by TIMED GUVI and SuperDARN

Details Height-integrated Joule and particle heating rates determined by TIMED GUVI and SuperDARN Height-integrated Joule and particle heating rates determined by TIMED GUVI and SuperDARN

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa41b0434b&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SA41B-0434

Other

2407 Auroral Ionosphere (2704), 2411 Electric Fields (2712), 2427 Ionosphere/Atmosphere Interactions (0335), 2455 Particle Precipitation, 2463 Plasma Convection

Scientific paper

Magnetosphere-ionosphere coupling at high latitudes provides two important sources of thermal energy for the Earth's upper atmosphere: (1) particle heating by collisions with energetic auroral precipitation; and (2) Joule heating by dissipation of electric currents in the resistive ionosphere. In this paper, we present height-integrated Joule heating rates calculated by combining F-region electric field measurements from the Super Dual Auroral Radar Network (SuperDARN) with ionospheric conductivity estimates from the Global Ultraviolet Imager (GUVI) aboard the TIMED spacecraft. Hemispheric maps of Joule heating rates are compared with similar maps of particle heating rates determined from the GUVI auroral images. It is shown that auroral activity and the strength of ionospheric convection are, to a certain extent, anti-correlated with each other. One result of this behavior is that particle heating is generally the dominant heat source post-midnight, whereas Joule heating dominates near dusk.

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