Relationship between the Pi2 pulsations and the localized impulsive current associated with the current disruption in the magnetosphere
Earth, Planets and Space volume 52, pages 267–281 (2000)
Behavior of fast-magnetosonic-mode MHD signals in the inner magnetosphere that are driven by the impulsive eastward current is investigated as a model of the Pi2 signal at midnight. The magnetosphere is treated as an axisymmetric cold MHD regime with dipole magnetic fields and has the plasmaspheric structure of the Alfvén speed distribution. MHD perturbation is assumed to be axisymmetric. Numerical calculation revealed the following: 1) The impulsive current induces the plasmasphere virtual resonance oscillation; 2) The compressional magnetic field perturbation is confined near the equator; 3) The waveform of the compressional magnetic perturbation in the plasmasphere depends on the spatial extent of the source current, its temporal variation, as well as its location; 4) The typical Pi2 waveform in the plasmasphere is obtained when the source current is located near the plasmapause (L ≤10); 5) When the source current is not located on the equator, the compressional component and the poloidal component have different waveforms.
Allan, W., E. M. Poulter, and S. P. White, Hydromagnetic wave coupling in the magnetosphere—plasmapause effects on impulsive-excited resonances, Planet. Space Sci., 34, 1189–1200, 1986.
Fujita, S. and V. L. Patel, Eigenmode analysis of coupled magnetohydrodynamic oscillations in the magnetosphere, J. Geophys. Res., 97, 13777–13788, 1992.
Fujita, S. and K.-H. Glassmeier, Magnetospheric cavity resonance oscillations with energy flow across the magnetopause, J. Geomag. Geoelectr., 47, 1277–1292, 1995.
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, 21–48, 1997a.
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, 49–68, 1997b.
Kivelson, M. G. and D. J. Southwood, Coupling of global magnetospheric MHD eigenmodes to field line resonances, J. Geophys. Res., 91, 4345–4351, 1986.
Lee, D.H., Dynamics of MHD wave propagation in the low-latitude magnetosphere, J. Geophys. Res., 101, 15371–15386, 1996.
Lee, D.H., On the generation mechanism of Pi 2 pulsations in the magnetosphere, Geophys. Res. Lett., 25, 583–586, 1998.
Lee, D.H. and K. Kim, Compressional MHD waves in the magnetosphere: A new approach, J. Geophys. Res., 104, 12379–12385, 1999.
Lui, A. T. Y., Current disruption in the Earth’s magnetosphere: Observations and models, J. Geophys. Res., 101, 13067–13088, 1996.
Ohtani, S., S. Kokubun, and C. T. Russell, Radial expansion of the tail current disruption during substorms: Anew approach to the substorm onset region. J. Geophys. Res., 97, 3129–3136, 1992.
Osaki, H., K. Takahashi, H. Fukinishi, T. Nagatsuma, H. Oya, A. Matsuoka, and D. K. Milling, Pi2 pulsations observed from the Akebono satellite in the plasmasphere, J. Geophys. Res., 103, 17605–17615, 1998.
Pekrides, H., A. D. M. Walker, and P. R. Sutcliff, Global modeling of Pi 2 pulsations, J. Geophys. Res., 102, 14343–14354, 1997.
Samson, J. C., Pi 2 pulsations: High latitude results, Planet. Space Sci., 30, 1239–1247, 1982.
Southwood, D.J. and M. G. Kivelson, The effect of parallel inhomogeneity on magnetospheric hydromagnetic wave coupling, J. Geophys. Res., 91, 6871–6876, 1986.
Sutcliffe, P. R. and K. Yumoto, Dayside Pi 2 pulsations at low latitudes, Geophys. Res. Lett., 16, 887–890, 1989.
Sutcliffe, P. R. and K. Yumoto, On the cavity mode nature of low-latitude Pi 2 pulsations, J. Geophys. Res., 96, 1543–1551, 1991.
Takahashi, K., Studies of magnetospheric ULF waves using Active Magnetospheric Particle Tracer Explorers Charge Composition Explorer, J. Geomag. Geoelectr, 46, 953–970, 1994.
Takahashi, K., L. J. Zanetti, R. E. Lopez, R. W. McEntire, T. A. Potemra, and K. Yumoto, Disruption of the magnetotail current sheet observed by AMPTE/CCE, Geophys. Res. Lett., 14, 1019–1022, 1987.
Takahashi, K., S.-I. Ohtani, and K. Yumoto, AMPTE CCE observations of Pi 2 pulsations in the inner magnetosphere, Geophys. Res. Lett., 19, 1447–1450, 1992.
Takahashi, K., S.-I. Ohtani, and B. J. Anderson, Statistical analysis of Pi2 pulsations observed by the AMPTE CCE spacecraft in the inner magnetosphere, J. Geophys. Res., 100, 21929–21941, 1995.
Takahashi, K., W. J. Hughes, R. R. Anderson, and S. I. Solovyev, CRRES satellite observations associated with low-latitude Pi2 pulsations, J. Geophys. Res., 104, 17431–17440, 1999.
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, 1367–1383, 1989.
Yumoto, K., Evidences of magnetospheric cavity Pi 2 waves, J. Geomag. Geoelectr, 42, 1281–1290, 1990.
Yumoto, K., K. Takahashi, T. Saito, F. W. Menk, B. J. Fraser, T. A. Potemra, and L. J. Zanetti, Some aspects of relation between Pi 1–2 magnetic pulsations observed at L= 1.3–2.1 on the ground and substorm-associated magnetic field variations in the near-Earth magnetotail observed by AMPTE CCE, J. Geophys. Res., 94, 3611–3618, 1989.
Yumoto, K., K. Takahashi, T. Sakurai, P. R. Sutcliffe, S. Kokubun, H. Lühr, T. Saito, M. Kuwashima, and N. Sato, Multiple ground-based and satellite observations of global Pi 2 magnetic pulsations, J. Geophys. Res., 95, 15175–15184, 1990.
Yumoto, K., A. Isono, K. Shiokawa, H. Matsuoka, Y. Tanaka, F. W. Menk, B. J. Fraser, and 210° MM Magnetic Observation Group, Global cavity mode-like and localized field-line Pc3–4 oscillations stimulated by interplanetary impulses (Si/Sc): Initial results from the 210° MM magnetic observations, in Solar Wind Sources of Magnetospheric Ultra-Low-Frequency Waves, edited by M. J. Engebretson, K. Takahashi, and M. Scholer, 335 pp., American Geophysical Union, Washington, D.C., 1994.
Yumoto, K., V. Pilipenko, E. Fedorov, N. Kurneva, M. De Lauretis, and K. Kitamura, Magnetospheric ULF wave phenomena stimulated by SSC, J. Geomag. Geoelectr, 49, 1179–1195, 1997.
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Fujita, S., Itonaga, M. & Nakata, H. Relationship between the Pi2 pulsations and the localized impulsive current associated with the current disruption in the magnetosphere. Earth Planet Sp 52, 267–281 (2000). https://doi.org/10.1186/BF03351636
- Source Current
- Current Disruption
- Compressional Component
- Outer Magnetosphere
- Fast Mode Wave