A statistical study of Pc1 waves observed at Jang Bogo Station, Antarctica

Abstract

Search-soil magnetometer (SCM) was installed at Jang Bogo Station (JBS), Antarctica in the late of 2016 to measure magnetic field variations is the polar cap and/or cusp region. We have used 1-year’s data from JBS to statistical study Pc1 pulsations. The whole year data allow us to analyze seasonal and magnetic local time (MLT) dependence and investigate the possible generation processes of Pc1 waves. The occurrence of events is strong near the magnetic local noon and the ratio is predominantly during summer season than winter season. This seasonal and MLT distribution is due to the relative position of cusp. The interesting features is that there are no such dependences for high coherence and polarized events. We suggest that the high coherence (and polarized) waves may be not directly propagated from space, but propagated through the ionosphere, because the cusp is a region of energy input from space to the ground. We will more detail discuss using in-situ measurements of magnetic field and plasma composition by SWARM and DMSP.