Department of Physics,School of Liberal Arts, Asahi University/ National Institute of Polar Research/National Institute of Polar Research
抄録(英)
In the cosmic radio noise absorption (CNA) data obtained by a riometer at Syowa Station, CNA pulsations were sometimes observed following geomagnetic sudden commencements (SC's). In order to investigate characteristics of the occurrence, 138 SC events were analyzed using 1-second CNA and geomagnetic data at Syowa Station from April 1981 to December 1986. Local time dependence can be seen in the SC-associated CNA pulsation (CNA Psc). The occurrence rate is highest in the morning and has a secondary peak before midnight, that is to say, it shows a marked dawn-dusk asymmetry. CNA Psc accompanies geomagnetic Psc at the time of strong CNA increase caused by large SC's with high pre-SC AE index. Furthermore, CNA Psc tends to be more correlated with the H component of magnetic Psc in the Psc 5 period range and the D component for shorter period in the Psc 4 range.
雑誌書誌ID
AA10756224
雑誌名
Proceedings of the NIPR Symposium on Upper Atmosphere Physics
CNA pulsations associated with geomagnetic sudden commencements
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KJ00000036032
(1.21MB)
概要
