Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa11a..04c&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA11A-04
Physics
0355 Thermosphere: Composition And Chemistry, 2415 Equatorial Ionosphere, 2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities
Scientific paper
Multi-Instrumented Studies of Equatorial Thermospheric Aeronomy (MISETA) was an NSF/CEDAR program of observations and modeling during the period 1993-2000. Here we report on three areas of investigation: (a) a 6300 Å airglow brightness wave (BW) that is driven by the midnight temperature maximum (MTM) pressure bulge, (b) latitude vs. local time patterns of zonal neutral winds and plasma drifts, and (3) the day-to-day variability of equatorial spread-F (ESF). All-sky airglow imagers in Peru and Argentina and Fabry-Perot Interferometers in Peru and Chile provided the new data sets used in these first coordinated sets of latitude-coupling in the same longitude sector at low latitudes. Model results came from the NCAR TIEGCM, the equatorial electrodynamics model of Eccles, and the NRL ionospheric models for low latitudes. The BW feature was found to extend to much higher latitudes than suggested by early satellite observations of MTM morphology, and it remains a feature not fully captured in GCM simulations. Neutral wind observations confirm the dominance of ion-drag upon thermospheric circulation in the equatorial anomaly region, but in patterns not reproduced satisfactorily in GCM and empirical models for low latitude winds. Airglow observations of plasma drifts show a coupled local time and geomagnetic latitude dependence arising from the complex relative influence of E- and F-region dynamo action, a process modeled rather successfully in current simulation codes. The ESF variability associated with changing meridional neutral winds has been shown to be a minor contributor to observed ESF occurrence patterns determine by optical and GPS diagnostic techniques. This finding is in clear contrast to earlier model predictions of ESF suppression by strong meridional winds.
Aarons Jules
Baumgardner Jeff
Biondi Matteo
Colerico M. J.
Eccles Vince
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