Discovery of very large amplitude whistler‐mode waves in Earth's radiation belts

Cattell, C. A.; Wygant, J. R.; Goetz, K.; Kersten, K.; Kellogg, P. J.; Rosenvinge, Tycho von; Bale, S. D.; Roth, I.; Temerin, M.; Hudson, M. K.; Mewaldt, R. A.; Wiedenbeck, M.; Maksimović, M.; Ergun, R. E.; Acuña, M. H.; Russell, C. T.

doi:10.1029/2007gl032009

Cited by 269 publications

(326 citation statements)

References 33 publications

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“…[28] Cattell et al [2008] have shown that very large amplitude, oblique whistlers can cause significant pitch-angle scattering and electron energization of high-energy test particle electrons on a time scale of ∼0.1 s. These simulations, based on those of Roth et al [1999], were run for this paper with conditions representative of the inner plasmasphere with the following results: resonant particles were seen to decrease their pitch angle by up to ∼20°and increase their energy by 25 keV in the same short time scale. Thus these whistler waves are able to pitch-angle scatter and energize electrons on a time scale orders of magnitude shorter than that of quasi-linear diffusion, the time-averaged manner in which small-amplitude whistler waves interact with electrons.…”

Section: Discussionmentioning

confidence: 99%

“…Analysis of STEREO burst memory data by Cattell et al [2008] led to the discovery of very large amplitude (>200 mV/m) whistler waves in the outer radiation belt. Wave-particle simulations suggested that these waves were sufficiently large in amplitude that they are able to strongly interact with highenergy electrons via nonlinear energization and pitch-angle scattering on a time scale of a single wave-electron encounter (∼0.1 s).…”

Section: Introductionmentioning

confidence: 99%

“…[4] The Cattell et al [2008] study was followed by observations of very large amplitude whistlers on THEMIS in the dawnside radiation belts from L = 3.5-5.5 [Cully et al, 2008], Wind Time Domain Sampler from L = 4 to L = 20 at the magnetosheath (P. J. Kellogg et al, Large amplitude whistlers in the magnetosphere observed with wind-waves, submitted to J. Geophys.…”

Section: Introductionmentioning

confidence: 99%

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Large-amplitude transmitter-associated and lightning-associated whistler waves in the Earth's inner plasmasphere atL< 2

et al. 2011

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[1] We report observations of very large amplitude whistler mode waves in the Earth's nightside inner radiation belt enabled by the STEREO Time Domain Sampler. Amplitudes range from 30-110 mV/m (zero-peak), 2 to 3 orders of magnitude larger than previously observed in this region. Measurements from the peak electric field detector (TDSMax) indicate that these large-amplitude waves are prevalent throughout the plasmasphere. A detailed examination of high time resolution electric field waveforms is undertaken on a subset of these whistlers at L < 2, associated with pump waves from lightning flashes and the naval transmitter NPM in Hawaii, that become unstable after propagation through the ionosphere and grow to large amplitudes. Many of the waveforms undergo periodic polarization reversals near the lower hybrid and NPM naval transmitter frequencies. The reversals may be related to finite plasma temperature and gradients in density induced by ion cyclotron heating of the plasma at 200 Hz, the modulation frequency of the continuous-mode NPM naval transmitter signal. Test particle simulations using the amplitudes and durations of the waves observed herein suggest that they can interact strongly with high-energy (>100 keV) electrons on a time scale of <1 s and thus may be an important previously unaccounted for source of energization or pitch-angle scattering in the inner radiation belt.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Large-amplitude transmitter-associated and lightning-associated whistler waves in the Earth's inner plasmasphere atL< 2

et al. 2011

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“…STEREO TDSMax, a once-per-minute record of the maximum high-frequency electric field, indicates that large amplitude waves were indeed present on all four crossings. The lack of burst captures then suggests that they were overwritten by later large amplitude waveforms, like the extremely large amplitude whistler mode waves reported by Cattell et al [2008], before they had a chance to be telemetered to the ground.…”

Section: Stereo and Wind Survey And Event Analysismentioning

confidence: 99%

STEREO and Wind observations of intense cyclotron harmonic waves at the Earth's bow shock and inside the magnetosheath

et al. 2013

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[1] We present the first observations of electron cyclotron harmonic waves at the Earth's bow shock from STEREO and Wind burst waveform captures. These waves are observed at magnetic field gradients at a variety of shock geometries ranging from quasi-parallel to nearly perpendicular along with whistler mode waves, ion acoustic waves, and electrostatic solitary waves. Large amplitude cyclotron harmonic waveforms are also observed in the magnetosheath in association with magnetic field gradients convected past the bow shock. Amplitudes of the cyclotron harmonic waves range from a few tens to more than 500 mV/m peak-peak. A comparison between the short (15 m) and long (100 m) Wind spin plane antennas shows a similar response at low harmonics and a stronger response on the short antenna at higher harmonics. This indicates that wavelengths are not significantly larger than 100 m, consistent with the electron cyclotron radius. Waveforms are broadband and polarizations are distinctively comma-shaped with significant power both perpendicular and parallel to the magnetic field. Harmonics tend to be more prominent in the perpendicular directions. These observations indicate that the waves consist of a combination of perpendicular Bernstein waves and field-aligned waves without harmonics. A likely source is the electron cyclotron drift instability which is a coupling between Bernstein and ion acoustic waves. These waves are the most common type of high-frequency wave seen by STEREO during bow shock crossings and magnetosheath traversals and our observations suggest that they are an important component of the high-frequency turbulent spectrum in these regions.

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“…They typically exhibit discrete rising or falling tones thought to originate from non-linear processes [4], but can also occur as wide-band incoherent hiss [5]. These chorus waves play a critical role in the acceleration of low-energy trapped radiation belt electrons to relativistic energies, and can also lead to rapid scattering loss into the atmosphere [6,7,8,9]. Previous attempts to remotely excite artificial whistler waves have been made in the Earth's near-space environment and have yielded interesting results [10,11], but have been difficult to probe and control.…”

Section: Introductionmentioning

confidence: 99%

Electron beam generated whistler emissions in a laboratory plasma

Compernolle¹,

An²,

Bortnik³

et al. 2015

AIP Conference Proceedings

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Discovery of very large amplitude whistler‐mode waves in Earth's radiation belts

Cited by 269 publications

References 33 publications

Large-amplitude transmitter-associated and lightning-associated whistler waves in the Earth's inner plasmasphere atL< 2

Large-amplitude transmitter-associated and lightning-associated whistler waves in the Earth's inner plasmasphere atL< 2

STEREO and Wind observations of intense cyclotron harmonic waves at the Earth's bow shock and inside the magnetosheath

Electron beam generated whistler emissions in a laboratory plasma

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