Research in magnetospheric wave phenomena

Abstract

During the last 4 years a number of developments have occurred which have led to an increased understanding of the role of wave phenomena in the physical processes of the magnetosphere. While the studies span the frequency regime from millihertz to the electron gyrofrequency, the developments to be discussed in this paper have in common that they have added substantially to the understanding of the controlling processes, regions, and boundaries in the magnetosphere. The topics discussed are the increased awareness and documentation of the role of the plasmapause in micropulsation generation and propagation; •he establishment of the role of ion cyclotron waves in the wave-particle interactions at the plasmapause; the discovery of magnetospheric electrostatic waves with w --(3/2)•_; the discovery and preliminary identification of the source of plasmaspheric hiss; and the analysis of storm time Pc 5 waves as observed on the satellites ATS 1 and Explorer 45. 960 1715 1720 1725 SlPLE (L:4.0) GIRARDVILLE (L=4.4) LAC REBOURS (L = 4.0) DURHAM (L=3.2) 1730 SIPLE GIRARDVILLE LAC REBOURS DURHAM 730 SIPLE GIRARDVILLE LAC REBOURS

Time structure of postmidnight energetic electron precipitation and the limit of stable trapping

“…There also seems to be general agreement that some waveparticle interaction is responsible for the necessary pitch angle scattering, and Kennel and Petschek [1966] showed that cyclotron resonance with whistler mode waves might account for the gross features of energetic electron precipitation. This general idea is supported by the many observations showing an association between energetic electron precipitation and the presence of VLF noise (see, for example, Oliven and Gurnett [1968], Rosenberg et al [197lb], and Holzer et al [1974]; for recent reviews, see, for example, Fredricks [1975], Gendrin [1975], and Barfield[1975]). Both electromagnetic waves [Burtis and Dunckel and Helliwell, 1969;Burton and Holzer, 1974;Smith, 1974, 1977;Burtis and Helliwell, 1976] and electrostatic waves [Kennel et al, 1970;Scarf et al, 1972] are found in the magnetosphere.…”

Electromagnetic kinetic instabilities in multicomponent space plasmas: Theoretical predictions and computer simulation experiments

“…This information led to the intensive use of plasma physics and 'plasma instabilities' in the interpretation of observed phenomena, such as particle precipitation via electromagnetic cyclotron instabilities; strong auroral precipitation via During the last 5 years a number of comprehensive review papers on various aspects of waves and instabilities in space have been written. These include those of Scarf [1975a, b], Barfield [1975], Thorne [1975Thorne [ , 1976, Gendrin [1975a, hi, Fredricks [1975, Ashour-Abdalla and Kennel [1976], Lanzerotti [1976], Coleman and McPherron [1976], Scarf and Russell [1976], Walker [1976], Gurnett [1976aGurnett [ , b, 1980, Papadopoulos [1977Papadopoulos [ , 1979, Barnes [1978Barnes [ , 1979, Hollweg [1978], Helliwell and Katsufrakis [1978], Lyons [1978], Shawhah [1978,1979], and Rostoker [1979]; also see the excellent books edited by Gurnett, 1980]. Hultqvist and Stenfio [1975], Williams [1976], McCormac [1976], and Kennel et al [1978].…”