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Low‐latitude Pi2 pulsations during intervals of quiet geomagnetic conditions ( K p ≤1 )
Author(s) -
Kwon H.J.,
Kim K.H.,
Jun C.W.,
Takahashi K.,
Lee D.H.,
Lee E.,
Jin H.,
Seon J.,
Park Y.D.,
Hwang J.
Publication year - 2013
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/jgra.50582
Subject(s) - earth's magnetic field , quiet , magnetosphere , latitude , physics , excited state , solar wind , atmospheric sciences , geomagnetic secular variation , geophysics , geomagnetic latitude , low latitude , ionosphere , astrophysics , geomagnetic storm , magnetic field , atomic physics , astronomy , quantum mechanics
It has been reported that Pi2 pulsations can be excited under extremely quiet geomagnetic conditions ( K p =0). However, there have been few comprehensive reports of Pi2 pulsations in such a near ground state magnetosphere. To understand the characteristics of quiet‐time Pi2 pulsations, we statistically examined Pi2 events observed on the nightside between 1800 and 0600 local time at the low‐latitude Bohyun (BOH, L = 1.35) station in South Korea. We chose year 2008 for analysis because geomagnetic activity was unusually low in that year. A total of 982 Pi2 events were identified when K p ≤1. About 80% of the Pi2 pulsations had a period between 110 and 300 s, which significantly differs from the conventional Pi2 period from 40 to 150 s. Comparing Pi2 periods and solar wind conditions, we found that Pi2 periods decrease with increasing solar wind speed, consistent with the result of Troitskaya (1967). The observed wave properties are discussed in terms of plasmaspheric resonance, which has been proposed for Pi2 pulsations in the inner magnetosphere. We also found that Pi2 pulsations occur quasi‐periodically with a repetition period of ∼23–38 min. We will discuss what determines such a recurrence time of Pi2 pulsations under quiet geomagnetic conditions.