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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 16, issue 7
Ann. Geophys., 16, 787–803, 1998
https://doi.org/10.1007/s00585-998-0787-1
© European Geosciences Union 1998
Ann. Geophys., 16, 787–803, 1998
https://doi.org/10.1007/s00585-998-0787-1
© European Geosciences Union 1998

  31 Jul 1998

31 Jul 1998

ULF waves: 1997 IAGA division 3 reporter review

K. Takahashi K. Takahashi
  • Solar-Terrestrial Environment Laboratory, Nagoya University, Toyokawa 442, Japan
  • Also at: The Johns Hopkins University Applied Physics Laboratory, Johns Hopkins Road, Laurel, MD 20723-6099, USA

Abstract. Highlights of studies of ULF waves from 1995 to early 1997 are presented. The subjects covered include (1) Pc 3–5 waves excited by sources in the solar wind, with emphasis on the role of the magnetospheric cavity in modifying the external source and establishing its own resonances, and the role of the plasmapause in magnetohydrodynamic wave propagation; (2) Pi 2 waves, with emphasis on the plasmaspheric resonances and possible alternative excitation by plasmasheet source waves; (3) the spatial structure of internally excited long-period waves, including a kinetic theory for radially confined ring current instability and ground-based multipoint observation of giant pulsations; (4) amplitude-modulated Pc 1–2 waves in the outer magnetosphere (Pc 1–2 bursts) and in the inner magnetosphere (structured Pc 1 waves or pearls); and (5) the source region of the quasi-periodic emissions. Theory and observations are compared, and controversial issues are highlighted. In addition, some future directions are suggested.

Key words. Magnetospheric physics (MHD waves and instabilities; Plasma waves and instabilities; Solar wind · magnetosphere interactions)

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