Seasonal dependence of the nighttime traveling ionospheric disturbances in the mid-latitude ionosphere A．Saito1,2, M.C. Kelley1, T. Tsugawa2, J.J. Makela1,

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Presentation transcript:

Seasonal dependence of the nighttime traveling ionospheric disturbances in the mid-latitude ionosphere A．Saito1,2, M.C. Kelley1, T. Tsugawa2, J.J. Makela1, Y. Otsuka3, and S. Miyazaki4 School of Electrical and Computer Engineering, Cornell University Department of Geophysics, Graduate School of Science, Kyoto University Solar-Terrestrial Environment Laboratory, Nagoya University Geographical Survey Institute A GPS network in Japan has detected TEC wave fronts that travel to the southwest in the nighttime. Medium-scale traveling ionosphere disturbances (MSTIDs) Local time, seasonal, latitudinal and solar cycle dependencies of these MSTIDs

Standard deviation of TEC over the MU radar: amplitude of MSTIDs May 16-24, 1998 Geomagnetic Activity: SKp SKp:19 17+ 17 11- 18 22 14- 20- 21

Summer Equinox Winter

Standard deviation of TEC Ratio to the background TEC

Standard deviation of TEC Tsukuba January 1994 – August 2000 Ratio to the background TEC Tsukuba January 1994 – August 2000

CGM-Lat: 38.6 (Receiver 0001) CGM-Lat: 33.3 (Receiver 0183) CGM-Lat: 27.4 (Receiver 0428) CGM-Lat: 21.5 (Receiver 0494)

West Pacific Sector (South): Alice Springs European Sector: Noto Long: 15.0, Lat: 36.9, CGM-Lat: 29.1 West Pacific Sector (South): Alice Springs Long: 133.9, Lat: -23.7, CGM-Lat: -34.2 American Sector (South): Isabella Long: 292.9, Lat: 18.5, CGM-Lat: 28.9 American Sector (South): La Plata Long: 302.1, Lat: -34.9, CGM-Lat: -23.1

Summary Medium-scale traveling ionospheric disturbances in the midlatitude ionosphere detected with total electron content observation by GPS receivers. Propagation velocity:100m/s, wavelength: 300km Nighttime: Southwestward propagation, Summer and Winter Daytime: Southward (south-southeastward) propagation, Winter Daytime peak is common at any longitudes. Nighttime peaks show longitudinal differences. Day-to-day variation: No geomagnetic activity dependency Low amplitude in the high solar activity period Amplitude of nighttime TID is large at lower latitudes. [CGM-Lat: 20-40 degrees]