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- W2149787105 abstract "Short period geomagnetic pulsations called IPDP (intervals of pulsations of diminishing periods) are investigated, using ground data obtained at 35 campaign stations in the northern polar region. Comparison of the frequency-time (f-t) spectrograms of data from the stations shows that the internal structures of f-t pattern of IPDP pulsations vary with a small separation between stations. The variability of the internal structures suggests that “an IPDP event” consists of many discrete wave packets each of which comes from individual sources. Spatial-temporal developments of IPDP wave power are also examined. The two-dimensional distribution of IPDP power is both highly structured in space, suggesting presence of discrete source regions, and also highly variable with time, indicating characteristic dynamic features of the source regions. The source regions are located in the dusk half of the magnetosphere in a range of L value from 4 to 10. Three types of dynamics of the source regions are found; 1) fast westward motion consistent with magnetic-drift velocity of 60-70keV protons in the magnetosphere, 2) quasi-stationary sources, which are almost stationary in the magnetospheric frame for periods longer than 10 minutes, 3) evolution of the IPDP region toward the night and earthward with increase in center frequency. When the westward moving sources arrive at the location of the stationary sources, they merge with them and do not go further westward beyond the stationary sources. These time developments of the IPDP source regions comprehensively explain most of the IPDP characteristics so far obtained from observations in a limited area. Not only well-defined IPDP's but also IPDP-like events with small and slower frequency rise were observed in high latitudes associated with concurrent magnetic field depressions at synchronous orbit and with positive magnetic bays. For both, the magnetic field depression is probably due to hot plasma injection into the evening sector, although clear substorm onsets were only identified for well-defined IPDP's. The occurrence rate of IPDP events monitored within the semi-global coverage of the network was once every six days or 20 percent in hourly occurrence in the dusk sector, more than twice the previously reported rate. The occurrence rate of IPDP is still much smaller than that of substorms. The small occurrence shows that IPDP events are not caused by every “plasma injection” associated with substorms." @default.
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- W2149787105 date "1988-01-01" @default.
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- W2149787105 title "Multi-station observation of IPDP micropulsations - Two-dimensional distribution and evolution of the source regions." @default.
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- W2149787105 doi "https://doi.org/10.5636/jgg.40.583" @default.
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