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Spectral power of low-latitude Pi 2 pulsations at the 210° magnetic meridian stations and plasmaspheric cavity resonances

Earth, Planets and Space volume 52, pages 615–627 (2000)Cite this article

Abstract

Pi 2 pulsations at low latitudes are examined with magnetic fields data at the 210° magnetic meridian (MM) stations in 1991. Due to high degree of coherence over most latitudes, 68 low-latitude Pi 2 events at the 210° MM stations are identified with reference to same waveforms on the magnetogram at Lunping (189.5° MM, L = 1.06). With spectral power analysis, the ratio of the first four harmonic frequencies of low-latitude Pi 2 pulsations is about 1: (1.7 ± 0.1): (2.3 ± 0.1): (2.9 ± 0.1). By using abox model for the inner magnetosphere, the cold linearized MHD wave equations are studied with realistic Alfven speed profile for nonuniform ambient magnetic fields. With appropriate parameters to depict the magnetospheric environments during the aforementioned period, numerical results are acquired with the fourth order Runge-Kutta method. It is found that the ratio of the first four harmonic frequencies of plasmaspheric cavity resonances is about 1: 1.7: 2.4: 3.1 that is consistent with data analysis. This suggests that low-latitude Pi 2 pulsations at the 210° MM stations may be plasmaspheric cavity resonances driven by fast compressional waves owing to the impulsive source at the magnetotail.

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Authors and Affiliations

  1. Department of Physics, National Huwei Institute of Technology, Hu-Wei, Taiwan, 63201, ROC

    Ching-Chang Cheng

  2. Institute of Space Science, National Central University, Chung-Li, Taiwan, 32001, ROC

    Jih-Kwin Chao

  3. Department of Earth and Planetary Sciences, Kyushu University, 6-10-1 Hakozaki, Fukuoka, 812-8581, Japan

    Kiyohumi Yumoto

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  1. Ching-Chang Cheng
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  2. Jih-Kwin Chao
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  3. Kiyohumi Yumoto
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Correspondence to Ching-Chang Cheng.

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Cheng, CC., Chao, JK. & Yumoto, K. Spectral power of low-latitude Pi 2 pulsations at the 210° magnetic meridian stations and plasmaspheric cavity resonances. Earth Planet Sp 52, 615–627 (2000). https://doi.org/10.1186/BF03351670

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