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A plasmaspheric cavity resonance in a longitudinally non-uniform plasmasphere

Abstract

Power spectra of a plasmaspheric cavity resonance (strictly, a plasmaspheric virtual resonance) in a longitudinally non-uniform plasmasphere are calculated. It is shown that the spectra depend on longitude. Therefore, a cavity resonance mode can have local time depending spectra when the plasmasphere is non-uniform in a longitudinal direction. This fact concludes that the local time dependent peak frequencies of the mid- and low-latitude Pi2 pulsations discussed by Kosaka et al. (2002) are also explained by the cavity resonance model. We also discuss that the surface eigenmode can be a possible generation mechanism for Pi2 pulsations localized in a longitudinal direction.

References

  • Carpenter, D. L., Whistler evidence of the dynamic behavior of the duskside bulge in the plasmasphere. J. Geophys. Res., 75, 3837, 1970.

    Article  Google Scholar 

  • Chen, L. and A. Hasegawa, A theory of long-period magnetic pulsations, 2. Impulsive excitation of surface eigenmode, J. Geophys. Res., 79, 1033, 1974.

    Article  Google Scholar 

  • Fujita, S. and K.-H. Glassmeier, Magnetospheric cavity resonance oscillations with energy flow across the magnetopause, J. Geomag. Geoelectr., 47, 1277, 1995.

    Article  Google Scholar 

  • Fujita, S., M. Itonaga, and H. Nakata, Relation between the Pi2 pulsations and the localized impulsive current associated with the current disruption in the magnetosphere, Earth Planets Space, 52, 267, 2000.

    Article  Google Scholar 

  • Fujita, S., T. Mizuta, M. Itonaga, A. Yoshikawa, and H. Nakata, Transient MHD impulses in the magnetosphere-ionosphere system: The 2D model of the Pi2 pulsation, Geophys. Res. Lett., 28, 2161, 2001.

    Article  Google Scholar 

  • Fujita, S., M. Itonaga, A. Yoshikawa, H. Nakata, and T. Mizuta, A numerical simulation of the Pi2 pulsations associated with the substorm current wedge, J. Geophys. Res., 107(A3), 10.1029/2001JA000137, 2002.

  • Itonaga, M., A. Yoshikawa, and K. Yumoto, One-dimensional transient response of the inner magnetosphere at the magnetic equator, 1. Transfer function and poles, J. Geomag. Geoelectr., 49, 21, 1997a.

    Article  Google Scholar 

  • Itonaga, M., A. Yoshikawa, and K. Yumoto, One-dimensional transient response of the inner magnetosphere at the magnetic equator, 2. Analysis of waveform, J. Geomag. Geoelectr., 49, 49, 1997b.

    Article  Google Scholar 

  • Kivelson, M. G. and D. J. Southwood, Coupling of global magnetospheric MHD eigenmodes to field line resonances, J. Geophys. Res., 91, 4345, 1986.

    Article  Google Scholar 

  • Kosaka, K., T. Iyemori, M. Nosé, M. Bitterly, and J. Bitterly, Local time dependence of the dominant frequency of Pi2 pulsations at mid- and low-latitudes, Earth Planets Space, 54, 771, 2002.

    Article  Google Scholar 

  • Lee, D.-H., Dynamics of MHD wave propagation in the low-latitude magnetosphere, J. Geophys. Res., 101, 15371, 1996.

    Article  Google Scholar 

  • Lee, D.-H., On the generation mechanism of Pi 2 pulsations in the magnetosphere, Geophys. Res. Lett., 25, 583, 1998.

    Article  Google Scholar 

  • Lee, D.-H., R. L. Lysak, and Y. Song, Field line resonances in a nonaxisymmetric magnetic field, J. Geophys. Res., 105, 10703, 2000.

    Article  Google Scholar 

  • Li, Y., K. Yumoto, M. Itonaga, M. Shinohara, T.-I. Kitamura, and CPMN group, Equatorial Pi2’s as indicators of substorms and the relation between dayside and nightside Pi2’s, in SUBSTORMS-4, edited by S. Kokubun and Y. Kamide, pp. 555, 1998.

  • Lui, A. T. Y., Current disruption in the Earth’s magnetosphere: Observations and models, J. Geophys. Res., 101, 13067, 1996.

    Article  Google Scholar 

  • Nosé, M., K. Takahashi, T. Uozumi, K. Yumoto, D. M. Milling, and P. R. Milling, Multi-point observations of a Pi2 pulsation on morning side, Proc. Sixth Int. Conf. on Substorms, edited by R. M. Winglee, 93, 2002.

  • Pekrides, H., A. D. M. Walker, and P. R. Sutcliff, Global modeling of Pi 2 pulsations, J. Geophys. Res., 102, 14343, 1997.

    Article  Google Scholar 

  • Sutcliffe, P. R. and K. Yumoto, Dayside Pi 2 pulsations at low latitudes, Geophys. Res. Lett., 16, 887, 1989.

    Article  Google Scholar 

  • Sutcliffe, P. R. and K. Yumoto, On the cavity mode nature of low-latitude Pi 2 pulsations, J. Geophys. Res., 96, 1543, 1991.

    Article  Google Scholar 

  • Yeoman, T. K. and D. Orr, Phase and spectral power of mid-latitude Pi 2 pulsations: Evidence for a plasmaspheric cavity resonance, Planet. Space Sci., 37, 1367, 1989.

    Article  Google Scholar 

  • Yumoto, K., Evidences of magnetospheric cavity Pi 2 waves, J. Geomag. Geoelectr., 42, 1281, 1990.

    Article  Google Scholar 

  • Yumoto, K., and CPMN group, Characteristics of Pi2 geomagnetic pulsations observed at the CPMN stations: A review of the STEP results, Earth Planets Space, 53, 981, 2001.

    Article  Google Scholar 

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Fujita, S., Itonaga, M. A plasmaspheric cavity resonance in a longitudinally non-uniform plasmasphere. Earth Planet Sp 55, 219–222 (2003). https://doi.org/10.1186/BF03351751

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  • DOI: https://doi.org/10.1186/BF03351751

Key words

  • Pi2 pulsation
  • non-uniform plasmasphere
  • cavity resonance