Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm32a..05r&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM32A-05
Physics
2407 Auroral Ionosphere (2704), 2463 Plasma Convection (2760), 2760 Plasma Convection (2463), 2776 Polar Cap Phenomena
Scientific paper
The ExB drift of plasma in the high-latitude ionosphere is imaged by a variety of space and ground-based techniques. The ion drift meters carried by the DMSP series of low-altitude sun-synchronous satellites provide samplings of the cross-track convection velocity on transpolar passes with a cadence of 100 min while the SuperDARN HF radars observe line-of-sight plasma convection within local fields of view at a cadence of 1-2 min. The ensemble of SuperDARN measurements is routinely fitted for a depiction of the global convection pattern. Occasionally it is possible to directly compare nearly simultaneous and collocated velocity measurements between the two systems. Also, it is often possible to compare the potential variations measured by the satellite and that implied for the satellite track by the global SuperDARN fitting. We present a comparison of convection parameters obtained from the ground- and space-based measurements during particularly favorable conjunctions of DMSP overflights with SuperDARN coverage. We consider direct velocity estimates, the location of convection reversal boundaries, the variation in the electrostatic potential, and the total potential drop. We show that the convection usually extends to latitudes lower than that which is commonly assumed for high latitude convection and discuss corrections and adjustments to the datasets that are required to bring them into better agreement. We present examples of instantaneous potential patterns obtained by the merging the SuperDARN and DMSP datasets that represent a more complete solution for the global convection pattern.
Hairston Marc
Ruohoniemi J.
Shepherd Simon G.
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