A first approach to model the low-frequency wave activity in the plasmasphere

André, R.; Lefeuvre, F.; Simonet, F.; Inan, U. S.

doi:10.5194/angeo-20-981-2002

Cited by 29 publications

(37 citation statements)

References 47 publications

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“…1 clearly demonstrate that the spectral density of magnetosonic waves is concentrated within 5-7 • MLat from the magnetic equator which is consistent with earlier findings (e.g. André et al, 2002;Santolík et al, 2004). It has to be mentioned that the MLT distribution of equatorial magnetosonic emissions became a subject of long-term controversy.…”

Section: Magnetosonic Wavessupporting

confidence: 80%

“…Original paper by Thorne et al (1973) suggested that plasmaspheric hiss can be found at all MLT, and few recent studies (e.g. André et al, 2002;Meredith et al, 2004;Green et al, 2005) have demonstrated that these waves occur primarily on the day side with maximum intensities in the post-noon MLT sector which is consistent with the distributions presented here. Relatively high spectral densities that are seen in Fig.…”

Section: Plasmaspheric Hisssupporting

confidence: 78%

“…In order to estimate the pitch angle diffusion coefficients it is necessary to know distributions of the intensity of various plasma waves within outer radiation belts. A few efforts have been made recently to create statistical databases of wave properties using Dynamic Explorer 1 (DE-1) (André et al, 2002;Green et al, 2005) and CRRES (Meredith et al, 2001(Meredith et al, , 2004 spacecraft. However, all existing databases use the data from a single spacecraft and thus have limited spatial coverage.…”

Section: Introductionmentioning

confidence: 99%

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Survey of ELF-VLF plasma waves in outer radiation belt observed by Cluster STAFF-SA experiment

et al. 2008

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Abstract. Various types of plasma waves have profound effects on acceleration and scattering of radiation belt particles. For the purposes of radiation belt modeling it is necessary to know statistical distributions of plasma wave parameters. This paper analyzes four years of plasma wave observations in the Earth's outer radiation belt obtained by the STAFF-SA experiment on board Cluster spacecraft. Statistical distributions of spectral density of different plasma waves observed in ELF-VLF range (chorus, plasmaspheric hiss, magnetosonic waves) are presented as a function of magnetospheric coordinates and geomagnetic activity indices. Comparison with other spacecraft studies supports some earlier conclusions about the distribution of chorus and hiss waves and helps to remove the long-term controversy regarding the distribution of equatorial magnetosonic waves. This study represents a step towards the development of multi-spacecraft database of plasma wave activity in radiation belts.

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Section: Magnetosonic Wavessupporting

confidence: 80%

Section: Plasmaspheric Hisssupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

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Survey of ELF-VLF plasma waves in outer radiation belt observed by Cluster STAFF-SA experiment

et al. 2008

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“…Later observations (Gurnett, 1976;Perraut et al, 1982;Laakso et al, 1990;Kasahara et al, 1994;André et al, 2002) revealed that the equatorial noise occurs at radial distances between 2 and 7 R E , and at latitudes within 10 • from the magnetic equator, and that its lowest frequency could go down to the fundamental f H + . Detailed time-frequency spectrograms (Gurnett, 1976) also showed that, what appears as a noise band in the low resolution data, is in fact a superposition of many spectral lines with different frequency spacings.…”

Section: Introductionmentioning

confidence: 99%

“…These emissions are, together with the whistler mode chorus, among the most intense electromagnetic waves observed in the low-latitude region of the Earth's magnetosphere, and their sensitivity to the variations of the geomagnetic activity indicates their importance for the "space weather" applications, i.e. prediction of fluxes of energetic particles as a consequence of variations of the solar input (André et al, 2002). Therefore, we focus our attention on the probability densities of the wave intensity in both electric and magnetic components.…”

Section: Introductionmentioning

confidence: 99%

Systematic analysis of equatorial noise below the lower hybrid frequency

et al. 2004

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Abstract.We report results of a systematic analysis of a large number of observations of equatorial noise between the local proton cyclotron frequency and the local lower hybrid frequency. The analysis is based on the data collected by the STAFF-SA instruments on board the four Cluster spacecraft. The data set covers their first two years of measurement in the equatorial magnetosphere at radial distances between 3.9 and 5 Earth radii. Inspection of 781 perigee passages shows that the occurrence rate of equatorial noise is approximately 60%. We identify equatorial noise by selecting data with nearly linearly polarized magnetic field fluctuations. These waves are found within 10 • of the geomagnetic equator, consistent with the published past observations. Our results show that equatorial noise has the most intense magnetic field fluctuations among all the natural emissions in the given interval of frequencies and latitudes. Electric field fluctuations of equatorial noise are also more intense compared to the average of all detected waves. Equatorial noise thus can play a non-negligible role in the dynamics of the internal magnetosphere.

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Extremely intense ELF magnetosonic waves: A survey of polar observations

et al. 2014

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A Polar magnetosonic wave (MSW) study was conducted using 1 year of 1996-1997 data (during solar minimum). Waves at and inside the plasmasphere were detected at all local times with a slight preference for occurrence in the midnight-postmidnight sector. Wave occurrence (and intensities) peaked within~±5°of the magnetic equator, with half maxima at~±10°. However, MSWs were also detected as far from the equator as +20°and 60°MLAT but with lower intensities. An extreme MSW intensity event of amplitude B w =~± 1 nT and E w =~± 25 mV/m was detected. This event occurred near local midnight, at the plasmapause, at the magnetic equator, during an intense substorm event, e.g., a perfect occurrence. These results support the idea of generation by protons injected from the plasma sheet into the midnight sector magnetosphere by substorm electric fields. MSWs were also detected near noon (1259 MLT) during relative geomagnetic quiet (low AE). A possible generation mechanism is a recovering/expanding plasmasphere engulfing preexisting energetic ions, in turn leading to ion instability. The wave magnetic field components are aligned along the ambient magnetic field direction, with the wave electric components orthogonal, indicating linear wave polarization. The MSW amplitudes decreased at locations further from the magnetic equator, while transverse whistler mode wave amplitudes (hiss) increased. We argue that intense MSWs are always present somewhere in the magnetosphere during strong substorm/convection events. We thus suggest that modelers use dynamic particle tracing codes and the maximum (rather than average) wave amplitudes to simulate wave-particle interactions.

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A first approach to model the low-frequency wave activity in the plasmasphere

Cited by 29 publications

References 47 publications

Survey of ELF-VLF plasma waves in outer radiation belt observed by Cluster STAFF-SA experiment

Survey of ELF-VLF plasma waves in outer radiation belt observed by Cluster STAFF-SA experiment

Systematic analysis of equatorial noise below the lower hybrid frequency

Extremely intense ELF magnetosonic waves: A survey of polar observations

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