https://repository.kopri.re.kr/handle/201206/12842 2026-04-07T16:03:20Z 2026-04-07T16:03:20Z Kim, Gi-Jeong Kim, Khan-Hyuk Kwon, Hyuck-Jin Shiokawa, Kazuo Takahashi, Kazue Hwang, Junga https://repository.kopri.re.kr/handle/201206/13603 2022-07-07T06:22:44Z 2020-08-01T00:00:00Z

Title: Long-­Lasting Ground-­Satellite High Coherence of Compressional Dayside Pc3-Pc4 Pulsations Authors: Kim, Gi-Jeong; Kim, Khan-Hyuk; Kwon, Hyuck-Jin; Shiokawa, Kazuo; Takahashi, Kazue; Hwang, Junga Abstract: We present observations of broadband (similar to 10-50 mHz) Pc3-Pc4 waves on 4 January 2014. The waves were detected on the dayside simultaneously in a compressional component (delta B-z) at the Radiation Belt Storm Probes A (RBSP-A) in the inner magnetosphere and in the north-south component (delta H) on the ground at a low-latitude Bohyun (BOH) station (L = 1.3) during an interval of small interplanetary magnetic field cone angle, suggesting that upstream ultralow frequency (ULF) waves were the source of the magnetospheric Pc3-Pc4 waves. We observed the ground-satellite high coherence between RBSP-A delta B-z and BOH delta H for a prolonged time interval lasting 6.5hr, which has not been reported previously, during which RBSP-A was on the inbound and outbound legs moving from L = similar to 3.3 to similar to 6.3. In order to understand the spatial mode structure of the compressional waves, we examined the ground-satellite cross phase for the high-coherence interval and found that the waves observed in and out of the plasmasphere propagated earthward at the average fast-mode speed of similar to 700-1,000km/s. We also observed cross-phase values smoothly changing with the radial distance of the spacecraft across the plasmapause. This indicates that the presence of the plasmapause has little effect on our fast-mode waves propagating into the inner magnetosphere and to the ground low-latitude station.

2020-08-01T00:00:00Z