Solar cycle dependence of medium-scale traveling ionospheric disturbances observed by GPS receivers in Japan

Details Solar cycle dependence of medium-scale traveling ionospheric disturbances observed by GPS receivers in Japan Solar cycle dependence of medium-scale traveling ionospheric disturbances observed by GPS receivers in Japan

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa43b..04s&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA43B-04

Other

[2427] Ionosphere / Ionosphere/Atmosphere Interactions, [2435] Ionosphere / Ionospheric Disturbances, [2439] Ionosphere / Ionospheric Irregularities, [2443] Ionosphere / Midlatitude Ionosphere

Scientific paper

Long-term variability of medium-scale traveling ionospheric disturbances' (MSTIDs') activity was studied using Total Electron Content (TEC) observation by a GPS receiver network in Japan. MSTIDs are ionospheric structures whose scale size is a few hundreds kilometer, and propagation velocity is a few hundreds meter per second. They are frequently observed at mid-latitudes, but it is known that they occur also at high-latitudes and low-latitudes. It is interpreted that they are seeded by atmospheric gravity waves (AGWs) propagating from the lower atmosphere, and grow up through an ionospheric instability that couples the E-region ionosphere, the F-region ionosphere and ionospheres in the magnetic conjugate point. A GPS network in Japan, GEONET, can observe the horizontal distribution of TEC with about 20km of spatial resolution and 30 seconds of temporal resolution. The characteristics of MSTID were studied using the GEONET-TEC data from 1997 to 2009. It was found the amplitude of MSTID over Japan correlated with the solar activity. The amplitude was high during the solar maximum. It would be caused by high plasma density during the solar maximum. On the other hand, the ratio of MSTID amplitude to the background TEC in the nighttime showed anti-correlation to the solar activity. Both of the seeding mechanism by AGW and the growing mechanism by instability can contribute to this anti-correlation of the nighttime MSTID to the solar activity. The F-region field-aligned irregularities (FAIs) observed by the MU radar also show the anti-correlation of the solar activity. They were often observed during the solar minimum. The polarization electric field inside of MSTID would contribute to generate the mid-latitude F-region FAIs. Although MSTID have been studied in detail in Japan and the American sector, the global distribution of MSTID have not been fully clarified. To clarify the characteristics of MSTID including over oceans and the land that has little ground-based observation facilities, a space-borne observation will be carried out by ISS-IMAP mission from the international space station from 2012. The outline of ISS-IMAP will be introduced in the presentation.

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