HR: 09:15h
AN: SA21A-06    [PDF]
TI: Horizontal Distributions of Thermospheric Vertical Winds in the Polar Region
AU: * Ishii, M
EM: mishii@crl.go.jp
AF: Communications Research Laboratory, 4-2-1 Nukui-kita, Koganei, Tokyo, 184-8795 Japan
AU: Kubota, M
EM: mkubota@crl.go.jp
AF: Communications Research Laboratory, 4-2-1 Nukui-kita, Koganei, Tokyo, 184-8795 Japan
AU: Conde, M
EM: Mark.Conde@gi.alaska.edu
AF: Geophysical Institute, University of Alaska, 903 Koyukuk Dr., Fairbanks, AK 99775-7320 United States
AU: Smith, R W
EM: Roger.Smith@gi.alaska.edu
AF: Geophysical Institute, University of Alaska, 903 Koyukuk Dr., Fairbanks, AK 99775-7320 United States
AU: Krynicki, M
EM: ftmpk@aurora.alaska.edu
AF: Geophysical Institute, University of Alaska, 903 Koyukuk Dr., Fairbanks, AK 99775-7320 United States
AB: Thermospheric vertical winds can play a significant role in the thermospheric dynamics, energy balance between thermosphere and ionosphere, and displacement of the altitude profiles of mixing ratio for each atmospheric species. Optical measurements with Fabry-Perot Interferometers are powerful method to observe vertical winds, but the observing area is restricted in small portion of the sky just above the instruments. Several attempts have been executed to extend the observable region. Innis and Conde [2002a,b] shows thermospheric vertical winds obtainedfrom DE2 satellite data (WATS, NACS). In the recent studies, a rocket experimentwith TMA trail measured horizontal distribution of vertical winds in HEX (Horizontal E-region eXperiments) campaign on March 2003. In this campaign, multi-site observation with Fabry-Perot Interferometers was conducted for another approach. In this study, we will show several results of detailed analysis obtained with two Fabry-Perot Interferometers at Poker Flat Research Range (PFRR) and Eagle (EGL). These two sites are separated about 300 km along a typical auroral arc and we can expect to deduce vertical wind distribution on the vicinity of auroral arc from these results. The present results show that the vertical winds estimated from OI557.7nm at the two sites has high correlation (the correlation coefficients are higher than 0.6 in six of 13 nights). In many of low correlated cases, one observatory (EGL in most cases) was displaced from auroral arc. This results mean that the neutral wind system is uniform along the auroral arc. Innis, J. L., and M. Conde, High-latitude thermospheric vertical wind activity from Dynamics Explorer 2 Wind and Temperature Spectrometer Observations: Indications of a source region for polar cap gravity waves, J. Geophys. Res., 107, A8, 10.1029/2001JA009130, 2002a. Innis J. L., and M. Conde, Characterization of acoustic-gravity waves in the upper thermosphere using Dynamics Explorer 2 Wind and Temperature Spectrometer (WATS) and Nuetral Atmosphere Composition Spectrometer (NACS) data, J. Geophys. Res., 107, A12, 10.1029/2002JA009370, 2002b.
DE: 0310 Airglow and aurora
DE: 0358 Thermosphere--energy deposition
DE: 2437 Ionospheric dynamics
SC: SPA - Aeronomy [SA]
MN: 2003 Fall Meeting