Electromagnetic Ion Cyclotron Waves Observed in the Near Earth Plasma Sheet Boundary Layer.

Chaston, C. C.; Hu, Ying; Fraser, B. J.; Elphic, R. C.; Huang, C. Y.

doi:10.5636/jgg.46.987

Cited by 8 publications

(7 citation statements)

References 22 publications

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“…A variety of modes is possible, in principle. One of the main lines of distinction is whether the waves are dominated by a single ion species (Brinca et al, 1990;Chaston et al, 1994Chaston et al, , 1999 or interplay of multiple ion components should be invoked (Smith and Brice, 1964;Young et al, 1981;Gomberoff and Neira, 1983;Kozyra et al, 1984;Brinca et al, 1989). Based on wave data only, we shall have to question both hypotheses.…”

Section: Wave Properties -Discussionmentioning

confidence: 99%

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Ion cyclotron waves in the Earth’s magnetotail during CASSINI’s Earth swing-by

et al. 2003

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Abstract. The properties of low frequency magnetotail waves observed during CASSINI's Earth swing-by are examined. A maximum in the distribution of the waves about half the proton cyclotron frequency and a peak at linear polarisation are found and their implications are analysed in detail. Data on the fluid plasma velocity for the observation interval are not available and thus no unique conclusions about Doppler shift influence on the properties of the waves can be made. This determines the need to analyse different hypotheses in order to understand the origin of the waves. The plausibility of competing interpretations, such as off-resonance proton cyclotron waves and bi-ion cyclotron waves at the gyrofrequency of a heavy ion component of the magnetotail plasma in the form of He ++ ions of solar wind origin is questioned.

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Section: Wave Properties -Discussionmentioning

confidence: 99%

“…The near-Earth and distant magnetotail and its plasma sheet and plasma sheet boundary layer in particular, have been studied experimentally using ISEE data by , Cattell et al (1986), Elphic and Gary (1990), and Chaston et al (1994). AMPTE/IRM data underlie statistical studies by Bauer et al (1995) and Neagu et al (2001).…”

Section: Chastonmentioning

confidence: 99%

Ion cyclotron waves in the Earth’s magnetotail during CASSINI’s Earth swing-by

et al. 2003

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“…In addition, the plasma carries a field-aligned current due to the net ion drift in the rest frame. Angelopoulos et al 18 and Chaston et al 23 identify the beam anisotropy and the current driven kink-like 24 instabilities as the fastest growing electromagnetic modes in this region. It is the study of the self-consistent interaction between these two commonly occurring modes which provides the motivation for this research.…”

Section: Introductionmentioning

confidence: 97%

Quasilinear evolution of the ion cyclotron beam-anisotropy instability in a current carrying plasma

Chaston

Fraser

1999

Physics of Plasmas

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The evolution of particle velocity moments and wave spectra during the quasilinear saturation of the proton beam-anisotropy instability in a current carrying plasma is studied. For initial plasma moments characteristic of the near-Earth plasma sheet boundary layer, it is found that the saturation of the ion beam-anisotropy instability drives a field-aligned current, which self-consistently excites a kink-like mode. The driven current allows the wave fields of current driven mode to grow to amplitudes comparable to that of the anisotropy instability and facilitates more rapid isotropization of the unstable anisotropic beam components and saturation of the beam-anisotropy instability. This work has general relevance to the study of field-aligned instabilities in plasmas where the excited waves carry a net momentum density away from the source of instability.

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“…The transition between the highly anisotropic plasma distributions of the PSBL and the much more isotropic plasma sheet is thought to be mediated by one or more wave-particle interaction processes. Waves that could isotropize this plasma, with frequencies near the local proton cyclotron frequency W cp , have been observed in this region by several spacecraft [e.g., Tsurutani and Smith, 1984;Tsurutani et al, 1985;Angelopoulos et al, 1989;Chaston et al, 1994Chaston et al, , 2002Bauer et al, 1995;Kawano et al, 1994;Bogdanov et al, 2003].…”

Section: Introductionmentioning

confidence: 99%

Multiple harmonic ULF waves in the plasma sheet boundary layer observed by Cluster

et al. 2010

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[1] The passage of the Cluster satellites in a polar orbit through Earth's magnetotail has provided numerous observations of harmonically related Pc 1-2 ULF wave events, with the fundamental near the local proton cyclotron frequency W cp . Broughton et al. (2008) reported observations by Cluster of three such events in the plasma sheet boundary layer, and used the wave telescope technique to determine that their wave vectors k were nearly perpendicular to B. This paper reports the results of a search for such waves throughout the 2003 Cluster tail passage. During the 4 month period of July-October 2003, 35 multipleharmonic wave events were observed, all in the plasma sheet boundary layer (PSBL). From the first observed event (22 July) to the last (28 October), 13 of Cluster's 42 tail passes had at least one event. The wave events were rather evenly distributed from X GSE = −7 R E out to the Cluster apogee distance of −18 R E , with one event observed at −4 R E . Z GSE for these events ranged from −10 to −3 R E and +3 to +7 R E (i.e., there were no events for |Z| < 3 R E ). The wave events, with durations from ∼1 to 50 min, were consistently associated with signatures of the PSBL: elevated fluxes of counterstreaming ions with energies ranging from ∼3 to 30 keV, and elevated fluxes of electrons with energies ranging from 0.25 to ∼5 keV. Analysis of plasma parameters suggests that although waves occurred only when the ion beta exceeded 0.1 (somewhat larger than typical for the PSBL), ion particle pressure may be of more physical importance in controlling wave occurrence. Electron distributions were more isotropic in pitch angles than the ion distributions, but some evidence of counterstreaming electrons was detected in 83% of the events. The ions also showed clear signatures of shell-like or ring-like distributions; i.e., with reduced fluxes below the energy of maximum flux. The suprathermal ion fluxes were asymmetric in all events studied, with more ions streaming earthward (for events both north and south of the central plasma sheet). Good agreement between the observed frequency of the fundamental harmonic and the local W cp suggests that the waves were observed near the region of their origin and did not propagate along B, consistent with the wave telescope analysis.

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Electromagnetic Ion Cyclotron Waves Observed in the Near Earth Plasma Sheet Boundary Layer.

Cited by 8 publications

References 22 publications

Ion cyclotron waves in the Earth’s magnetotail during CASSINI’s Earth swing-by

Ion cyclotron waves in the Earth’s magnetotail during CASSINI’s Earth swing-by

Quasilinear evolution of the ion cyclotron beam-anisotropy instability in a current carrying plasma

Multiple harmonic ULF waves in the plasma sheet boundary layer observed by Cluster

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