Strong pitch-angle scattering of energetic electrons in the presence of electrostatic waves above the ionospheric trough region

Koons, H. C.; Vampola, A. L.; McPherson, Donald A.

doi:10.1029/ja077i010p01771

Cited by 26 publications

(19 citation statements)

References 10 publications

(3 reference statements)

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“…A possible mechanism is scattering by electromagnetic ion cyclotron waves (EMIC) waves, which we discuss further in section 3. Another possibility is scattering by electrostatic ion cyclotron waves [e.g., Koons et al , 1972; Vampola , 1977], but the L values seen here appear to be too low for such waves, which are usually associated with auroral field‐aligned currents, as we discuss further below. Also evident in Figure 3 is the motion (as a function of time) of the PBs to lower L ‐shells and their simultaneous intensification.…”

Section: Observationsmentioning

confidence: 86%

Observation of two distinct, rapid loss mechanisms during the 20 November 2003 radiation belt dropout event

et al. 2006

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[1] The relativistic electron dropout event on 20 November 2003 is studied using data from a number of satellites including SAMPEX, HEO, ACE, POES, and FAST. The observations suggest that the dropout may have been caused by two separate mechanisms that operate at high and low L-shells, respectively, with a separation at L $ 5. At high L-shells (L > 5), the dropout is approximately independent of energy and consistent with losses to the magnetopause aided by the Dst effect and outward radial diffusion which can deplete relativistic electrons down to lower L-shells. At low L-shells (L < 5), the dropout is strongly energy-dependent, with the higher-energy electrons being affected most. Moreover, large precipitation bands of both relativistic electrons and energetic protons are observed at low L-shells which are consistent with intense pitch angle scattering driven by electromagnetic ion cyclotron (EMIC) waves and may result in a rapid loss of relativistic electrons near the plasmapause in the dusk sector or in plumes of enhanced density.

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Section: Observationsmentioning

confidence: 86%

Observation of two distinct, rapid loss mechanisms during the 20 November 2003 radiation belt dropout event

et al. 2006

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“…This author points out that during periods of the most intense waves observed, electrons of energies up to 100 keV can undergo strong diffusion. Simultaneous measurements of energetic electrons and electrostatic waves, creating a sharply defined electron boundary, are reported by Koons et al [1972].…”

Section: Discussionmentioning

confidence: 99%

Prebay electron precipitation as seen by balloons and satellites

Rossberg¹

1976

J. Geophys. Res.

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Balloon observations of prebay X ray events and satellite observations of 40‐keV electron precipitation preceding magnetic substorms are compared. The electron precipitation has a small latitudinal but large longitudinal extent and extremely sharp latitudinal gradients. Maximum intensities are near the detection threshold for X ray observations by balloons. This explains the relatively low intensity of the prebay X ray events. Smooth variations of the X ray intensity may be a geometrical effect due to changing relative positions of the observational site and the precipitation zone. It is suggested that the prebay electron precipitation is caused by strong pitch angle scattering of trapped electrons near the earthward moving inner edge of the plasma sheet.

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“…Measurements at higher frequencies require higher time resolution in the experimental data which, among the techniques described earlier, has been achieved only for double probe potential difference measurements on rockets and satellites. Such experiments have been performed on more than 15 rockets [121,122,123,124,125,126,127,128,129] and 15 satellites in the ionosphere, magnetosphere, and interplanetary medium [130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148] over a frequency range that has generally been ~ 10 to ~ 105 Hz. Indirect measurements of the electric fields in waves can be made over a similar frequency range by other techniques.…”

Section: Introductionmentioning

confidence: 99%

Analyses of techniques for measuring DC and AC electric fields in the magnetosphere

Mozer

1973

Space Sci Rev

112

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Methods for measuring the amplitudes and directions of DC electric fields and the directions, power spectra, and dispersion relations of AC electric fields in the magnetosphere are discussed with emphasis on their applicability in various regimes of the magnetospheric plasma.. The two classes of techniques that are discussed are measurement of the bulk flow of the plasma and the potential difference between pairs of separated conductors. The plasma bulk flow discussion includes measurements by ionospheric radar backscatter, whistler mode wave propagation, energetic or thermal particle trajectories, artificial ion cloud motion, probe measurements of bulk flow, vehicle wake analyses, effects of bulk flow on the coupling of antennas, and the bulk flow of an artificial electron beam.

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Strong pitch-angle scattering of energetic electrons in the presence of electrostatic waves above the ionospheric trough region

Cited by 26 publications

References 10 publications

Observation of two distinct, rapid loss mechanisms during the 20 November 2003 radiation belt dropout event

Observation of two distinct, rapid loss mechanisms during the 20 November 2003 radiation belt dropout event

Prebay electron precipitation as seen by balloons and satellites

Analyses of techniques for measuring DC and AC electric fields in the magnetosphere

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