HR: 1340h
AN: SA33A-1070    [Abstracts]
TI: Simultaneous Observation of Traveling Ionospheric Disturbances and Traveling Atmospheric Disturbances Using a GPS Receiver Network and the GRACE Satellites
AU: * Murakami, N
EM: naomi@isas.jaxa.jp
AF: Department of Geophysics, Graduate school of Science, Kyoro University, Department Geophysics, 4th BLDG, Kyoto University, Kyoto, 606-8502, Japan
AU: * Murakami, N
EM: naomi@isas.jaxa.jp
AF: Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa, 229-8510, Japan
AU: Saito, A
EM: saitoua@kugi.kyoto-u.ac.jp
AF: Department of Geophysics, Graduate school of Science, Kyoro University, Department Geophysics, 4th BLDG, Kyoto University, Kyoto, 606-8502, Japan
AU: Tsugawa, T
EM: tsugawa@stelab.nagoya-u.ac.jp
AF: Solar-Terrestrial Environment Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8601, Japan
AB: The variations of the thermospheric mass density and the ionospheric electron density inside Large Scale Traveling Ionospheric Disturbances (LSTIDs) were studied with the GRACE accelerometer data and the GPS total electron content (GPS TEC) data. LSTIDs were detected by a GPS receiver network in Japan, GEONET, which is operated by Geographical Survey Institute. The characteristics of the LSTIDs, such as time, location, amplitude, wavelength, and propagation velocity, were derived from the TEC data of GEONET. The thermospheric total mass density at 500km altitude was derived from the high-accuracy accelerometers on board the GRACE satellites. The GRACE satellites flew over the LSTIDs during two events in August 2003 and November 2003. In both two events, wave-like structures of the thermospheric mass density were detected. They propagated from the high latitude to the low latitude in about 300m/s and 500m/s, and the spatial scales of the structures were about 2000km and 2500km, respectively. The velocities and the spatial scales of these Traveling Atmospheric Disturbances (TADs) were similar to those of LSTIDs detected by GEONET TEC in both events. In both two events, the ratio of the perturbation component of the neutral mass density to the background was about 11% and 18%, while that of the TEC was about 6% and 8%. These thermospheric total mass density variations of TADs are interpreted to cause the electron density variations of LSTIDs. We will discuss the relationship between LSTIDs measured by GPS receivers, and TADs detected by the GRACE accelerometers in this presentation.
DE: 2400 IONOSPHERE (6929)
DE: 2427 Ionosphere/atmosphere interactions (0335)
DE: 2435 Ionospheric disturbances
SC: SPA-Aeronomy [SA]
MN: 2007 Fall Meeting