Mesoscale and semiglobal scale view of the ionospheric electrodynamics of auroral torches

Details Mesoscale and semiglobal scale view of the ionospheric electrodynamics of auroral torches Mesoscale and semiglobal scale view of the ionospheric electrodynamics of auroral torches

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa22a0097a&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SA22A-0097

Physics

2407 Auroral Ionosphere (2704), 2409 Current Systems (2708), 2411 Electric Fields (2712), 2455 Particle Precipitation, 2494 Instruments And Techniques

Scientific paper

Within a substorm recovery phase, a train of omega bands formed in the early morning sector of the auroral oval on June 26, 1998, from ~ 02-04 UT. Some of the omega bands extended far polewards as auroral torches. These phenomena were observed on a semiglobal scale using the UVI and PIXIE instruments on the POLAR satellite, allowing to estimate electron spectra and ionospheric conductance distributions. In addition, semiglobal scale estimates of horizontal currents, field-aligned currents, and Joule heating were calculated using the AMIE procedure. Simultaneously, the omega bands/ torches were observed in Northern Scandinavia by the MIRACLE network, consisting of the IMAGE magnetometer network, the STARE coherent scatter radar, and all-sky cameras. The ground magnetic data were supplemented by the temporary BEAR network, the most extensive and dense magnetometer network set up in Scandinavia as yet. The ground-based data allow to calculate two-dimensional distributions of ionospheric horizontal currents, conductances, and field-aligned currents on a scale of ~ 50 km (mesoscale), using the 2D method of characteristics. In this presentation we concentrate on the analysis of the mesoscale ionospheric electrodynamics of the auroral torches for a few selected, representative timesteps. These results will be embedded in and compared with the semiglobal observations and analysis results. Particularly, we developed a new technique of combining UVI and PIXIE data that allows us to compute the conductances on areas smaller than the original ~ 700 km resolution of PIXIE. We compare the results of this technique with the ones of the 2D method of characteristics.

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