Precipitation of inner zone electrons by whistler mode waves from the VLF transmitters UMS and NWC

Koons, H. C.; Edgar, B. C.; Vampola, A. L.

doi:10.1029/ja086ia02p00640

Cited by 79 publications

(55 citation statements)

References 13 publications

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“…The corresponding pass lasts less than 10 minutes. We use the term ''wisp '' to describe the feature measured between L % 1.8 and 1.4 which shows a decrease in energy with increasing L, as expected from cyclotron resonance [e.g., Koons et al, 1981;Chang and Inan, 1983]. In Figure 3, the red stars give the results of computations of the resonant energy from first order equatorial cyclotron resonance with waves at 19800 Hz from NWC.…”

Section: Drift-loss Cone Observationsmentioning

confidence: 99%

Radiation belt electron precipitation due to VLF transmitters: Satellite observations

Sauvaud

Maggiolo

Jacquey

et al. 2008

Geophysical Research Letters

118

141

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[1] In the Earth's inner magnetosphere, the distribution of energetic electrons is controlled by pitch-angle scattering by waves. A category of Whistler waves originates from powerful ground-based VLF transmitter signals in the frequency range 10 -25 kHz. These transmissions are observed in space as waves of very narrow bandwidth. Here we examine the significance of the VLF transmitter NWC on the inner radiation belt using DEMETER satellite global observations at low altitudes. We find that enhancements in the $100 -600 keV drift-loss cone electron fluxes at L values between 1.4 and 1.7 are linked to NWC operation and to ionospheric absorption. Waves and particles interact in the vicinity of the magnetic equatorial plane. Using Demeter passes across the drifting cloud of electrons caused by the transmitter; we find that $300 times more 200 keV electrons are driven into the drift-loss cone during NWC transmission periods than during non-transmission periods. The correlation between the flux of resonant electrons and the Dst index shows that the electron source intensity is controlled by magnetic storm activity.

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Section: Drift-loss Cone Observationsmentioning

confidence: 99%

Radiation belt electron precipitation due to VLF transmitters: Satellite observations

Sauvaud

Maggiolo

Jacquey

et al. 2008

Geophysical Research Letters

118

141

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“…Under the condition of a given equatorial pitch angle α, EM frequency f and other parameters, the particle energy of the quasi-linear diffusion coefficient theory relies on the L value. The reports showed a decrease in energy with increasing L from cyclotron resonance ( Koons et al [1981]; Chang and Inan [1983]). In Figure. 6, we present the coupled energy of electron and proton depending on L value by theoretical calculation, (a)and (b) for electron coupling with R-mode EM wave, (c) and (d) for proton coupling with L-mode EM wave.…”

Section: Lmentioning

confidence: 99%

Study of typical space wave—particle coupling events possibly related with seismic activity

Zhang¹,

Wang²,

Shen³

et al. 2014

Chinese Phys. B

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Abstract. Based on the DEMETER satellite, we found two space wave-particle coupling events during February 2010 taking place in the range of McIlwain parameter L(1.27 ∼ 1.37). There are strong spatial and temporal correlation between the particle bursts(PBs) and the electromagnetic disturbances of the coupling events. The two PBs show different energy spectrum characteristics, while the corresponding electromagnetic disturbances concentrated on different frequencies range. In agreement with the prediction of the theory of wave-particle interaction, we conclude that the two wave-particle interactions can be probably explained as following: one is electron dominant precipitation with energy of 0.09 ∼ 0.2 MeV induced by VLF electromagnetic wave with the frequency of 14 ∼ 20 kHz, and another is proton dominant precipitation with energy of 0.65 ∼ 2.85 MeV induced by VLF electromagnetic wave with the frequency of ≤ 100 Hz. For the first time, those particle bursts origin, from electron or proton detected by the Instrument for the Detection of Particles(IDP) on board, is inferred by theory calculation, although the Instrument has no ability to identify the particle species.

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“…That particular paper was the first actual correlation of individual precipitation events with a single transmitter. Koons et al [1981] used structures in the inner zone drift loss cone electron distributions and synoptic VLF data to correlate electron precipitation events with specific transmission sequences from the VLF transmitters UMS and NWC. Irnhofet al [1983] utilized satellite observations of precipitating electrons in the slot, obtained in conjunction with special transmitting patterns from a ground-based VLF transmitter, to obtain a one-to-one correlation between VLF transmissions and electrons in the local bounce loss cone.…”

Section: Introductionmentioning

confidence: 99%

Electron precipitation in the vicinity of a VLF transmitter

Vampola¹

1987

J. Geophys. Res.

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Using high‐resolution pitch angle measurements made by a magnetic focusing electron spectrometer on the S3‐3 satellite, angular distributions of 235‐keV electrons precipitated in the slot region of the magnetosphere by a ground‐based VLF transmitter are compared with the pitch angle distributions that would be produced by various patterns of longitudinal interaction regions. The observed electrons are in the drift loss cone, necessitating the use of a trace‐back‐to‐longitude‐of‐origin technique coupled with a two‐dimensional convolution program describing the response of the electron spectrometer. The data are well fit both with theoretical calculations of ionospheric field intensity patterns above a transmitter and with a similar pattern of received field intensities measured along a traverse in the conjugate region. The agreement between the data and field patterns implies a linear or quasi‐linear wave‐particle interaction. The energy‐frequency relationship between the electrons and the waves implies an interaction region low on the magnetic field line rather than near the equator, as has been determined for similar precipitations in the inner zone.

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Precipitation of inner zone electrons by whistler mode waves from the VLF transmitters UMS and NWC

Cited by 79 publications

References 13 publications

Radiation belt electron precipitation due to VLF transmitters: Satellite observations

Radiation belt electron precipitation due to VLF transmitters: Satellite observations

Study of typical space wave—particle coupling events possibly related with seismic activity

Electron precipitation in the vicinity of a VLF transmitter

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