천문학회보 (The Bulletin of The Korean Astronomical Society)
- 제37권2호
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- Pages.121.2-121.2
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- 2012
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- 1226-2692(pISSN)
The statistical analysis of low-latitude Pi2 pulsations during the intervals of extremely quiet geomagnetic conditions
- Jun, Chae-Woo (School of Space Research, Kyung Hee University) ;
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Kim, Khan-Huk
(School of Space Research, Kyung Hee University) ;
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Lee, Dong-Hun
(School of Space Research, Kyung Hee University) ;
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Lee, Ensang
(School of Space Research, Kyung Hee University) ;
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Jin, Ho
(School of Space Research, Kyung Hee University) ;
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Park, Young-Deuk
(Korea Astronomy and Space Science Institute) ;
- Hwang, Junga (Korea Astronomy and Space Science Institute)
- 발행 : 2012.10.17
초록
Several case studies reported that low-latitude Pi2 pulsations can occur under extremely quiet geomagnetic condition (Kp = 0) and that those are not associated with substorms. Until now, no statistical study has investigated Pi2 activity at low latitude during non-substorm intervals. In this study, we statistically examine the properties of Pi2 pulsations (i.e., Pi2 pulsation's power, frequency, and duration) observed at low-latitude Bohyun (BOH, L = 1.35) station in Korea. 161 Pi2s are identified during the intervals of extremely quiet geomagnetic conditions (Kp = 0-1) on November 2008. It is found that their frequencies increase as the solar wind speed increases. It is also found that the Pi2 pulsations frequently occurred periodically every ~30 min. Using solar wind data, we discuss what determines the 30-min recurrence time of Pi2 pulsations
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