HR: 1340h
AN: A43A-0071    [Abstracts]
TI: Medium-scale traveling ionospheric disturbances observed over Southern California using the GPS networks
AU: * Kotake, N
EM: kotake@stelab.nagoya-uac.jp
AF: STELAB, Nagoya Univ., 3-13,honohara, Toyokawa, 442-8507 Japan
AU: Otsuka, Y
EM: otsuka@stelab.nagoya-u.ac.jp
AF: STELAB, Nagoya Univ., 3-13,honohara, Toyokawa, 442-8507 Japan
AU: Ogawa, T
EM: ogawa@stelab.nagoya-u.ac.jp
AF: STELAB, Nagoya Univ., 3-13,honohara, Toyokawa, 442-8507 Japan
AU: Tsugawa, T
EM: tsugawa@stelab.nagoya-u.ac.jp
AF: STELAB, Nagoya Univ., 3-13,honohara, Toyokawa, 442-8507 Japan
AU: Saito, A
EM: saitoua@kugi.kyoto-u.ac.jp
AF: Graduate School of Science,Kyoto Univ., Kitashirakawa-Oiwakechou, Kyoto, 611-0011 Japan
AU: Nishioka, M
EM: nishioka@kugi.kyoto-u.ac.jp
AF: Graduate School of Science,Kyoto Univ., Kitashirakawa-Oiwakechou, Kyoto, 611-0011 Japan
AB: We analyzed GPS data obtained from about 350 dual-frequency GPS receivers in Southern California in a whole year of 2002 to investigate two-dimensional structures of Medium-Scale Traveling Ionospheric Disturbances (MSTID). The GPS data were provided from International GPS Service (IGS) in Southern California, Southern California Integrated GPS Network (SCIGN) and Continuously Operating Reference Stations (CORS). We calculated Total Electron Content (TEC) from GPS data and subtracted 1-hour running average from time sequence of TEC obtained from each pair of GPS receiver and satellite to derive the perturbation component of TEC. Two-dimensional maps of the TEC perturbations within the area of 110- 124W and 30-40N were derived with a time resolution of 30 s and a spatial resolution of 0.15 x 0.15 degrees in longitude and latitude. About the local time dependence of MSTID occurrence rate, which is the ratio of MSTID occurring to the available data, in daytime, the highest MSITD occurrence rate is about 25% in winter, contrary, in nighttime, that is over 40% in summer. At Southern California, the MSTID propagates toward southeast (25%) and west-northwest (15%) in daytime and in nighttime, respectively. At Japan, the MSTID propagate toward south south-east and south-west in daytime and in nighttime, respectively. Consequently, these characters of MSTID between Japan and Southern California are just same. In this presentation, we also show statistical results of horizontal wavelength, horizontal phase velocity and period of MSTD observed over Southern California in 2002.
DE: 2400 IONOSPHERE (6929)
DE: 2439 Ionospheric irregularities
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005