Mid-latitude and plasmaspheric hiss: A review

Hayakawa, Masashi; Sazhin, Sergei

doi:10.1016/0032-0633(92)90089-7

Cited by 118 publications

(83 citation statements)

References 91 publications

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“…Taking into account oblique electromagnetic whistler waves would not change the obtained results quantitatively. Direction finding studies confirm that whistler waves propagating at small angles in the near-equatorial region are typical in the near plasmapause region (see Hayakawa et al (1986); Hayakawa and Sazhin (1992)). Quasi-electrostatic or unducted electromagnetic whistlers require a more complicated analysis, which is beyond the scope of this paper.…”

Section: Description Of the Modelmentioning

confidence: 63%

“…Quasi-periodic (QP) whistler emissions are the wide band emissions that are observed inside or near the plasmapause (see, for example, Helliwell (1965); Sato et al (1974); Hayakawa and Sazhin (1992); Sazhin and Hayakawa (1994)). They are characterized by a periodic modulation of wave intensity with typical periods from several seconds up to a few minutes.…”

Section: Introductionmentioning

confidence: 99%

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Modeling whistler wave generation regimes in magnetospheric cyclotron maser

et al. 2004

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Abstract. Numerical analysis of the model for cyclotron instability in the Earth's magnetosphere is performed. This model, based on the self-consistent set of equations of quasilinear plasma theory, describes different regimes of wave generation and related energetic particle precipitation. As the source of free energy the injection of energetic electrons with transverse anisotropic distribution function to the interaction region is considered. A parametric study of the model is performed. The main attention is paid to the analysis of generation regimes for different characteristics of energetic electron source, such as the shape of pitch angle distributions and its intensity. Two mechanisms of removal of energetic electrons from a generation region are considered, one is due to the particle precipitation through the loss cone and another one is related to the magnetic drift of energetic particles.It was confirmed that two main regimes occur in this system in the presence of a constant particle source, in the case of precipitation losses. At small source intensity relaxation oscillations were found, whose parameters are in good agreement with simplified analytical theory developed earlier. At a larger source intensity, transition to a periodic generation occurs. In the case of drift losses the regime of self-sustained periodic generation regime is realized for source intensity higher than some threshold. The dependencies of repetition period and dynamic spectrum shape on the source parameters were studied in detail. In addition to simple periodic regimes, those with more complex spectral forms were found. In particular, alteration of spikes with different spectral shape can take place. It was also shown that quasi-stationary generation at the low-frequency band can coexist with periodic modulation at higher frequencies.On the basis of the results obtained, the model for explanation of quasi-periodic whistler wave emissions is verified.

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Section: Description Of the Modelmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Modeling whistler wave generation regimes in magnetospheric cyclotron maser

et al. 2004

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“…Observations in the equatorial regions have been reported by many authors (Russell et al, 1969;Thorne et al, 1973;Parady et al, 1975;Cornilleau-Wehrlin et al, 1978, 1993Ondoh et al, 1983;Parrot and Lefeuvre, 1986;Sonwalkar and Inan, 1988;Hayakawa and Sazhin, 1992). Emissions are detected at all magnetic local time, but with higher amplitudes in the nightside (Russell et al, 1969).…”

Section: Introductionmentioning

confidence: 62%

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

et al. 2002

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Abstract.A comprehensive empirical model of waves is developed in the objective to simulate wave-particle interactions involved in the loss and acceleration of radiation belt electrons. Three years of measured magnetic wave field components from the Plasma Wave Instrument on board the DE-1 satellite are used to model the amplitude spectral density of the magnetic wave field of each type of emission observed in the equatorial regions of the plasmasphere: VLF transmitter emissions, chorus emissions, plasmaspheric hiss emissions and equatorial emissions below ∼ 200 Hz. Each model is a function of the wave frequency f , the MLT, L and Mlat parameters, and the K p values. The performances of the plasmaspheric hiss and chorus models are tested on amplitude spectra recorded on board the OGO-5 and GEOS-1 satellites.

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“…Helliwell, 1965;Sato et al, 1974;Hovner et al, 1977;Tixier and Cornilleau-Wehrlin, 1986;Hayakawa and Sazhin, 1992;Sazhin and Hayakawa, 1994;Smith et al, 1998). They are characterized by a periodic modulation of the wave intensity with typical periods from several seconds up to a few minutes.…”

Section: Introductionmentioning

confidence: 99%

Quasi-periodic ELF/VLF wave emissions in the Earth's magnetosphere: comparison of satellite observations and modeling

et al. 2004

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Abstract. We present the results of a case study of quasiperiodic (QP) ELF/VLF hiss emissions detected on board the Freja and Magion 5 satellites. Detailed analysis of available QP events revealed certain specific features of their dynamic spectra, which have not been reported earlier. In particular, we found an event with an increase in the frequency drift rate during the generation of a single element of QP emission, and an event with alteration of QP elements having different frequency drift rates. Another event demonstrates the possible relationship between QP hiss emissions and discrete VLF emissions. Properties of QP events are compared with parameters of energetic electrons and cold plasma, and other available data.Possible scenarios for the formation of these emissions are discussed on the basis of self-consistent simulations of the cyclotron instability, employing the information obtained experimentally. It is shown that the generation regime of selfsustained pulsations can explain consistently our data set. We show that our numerical model is capable of explaining the mentioned specific features of the dynamic spectrum of QP emissions. Comparison of the modeling results with experimental data yields an estimate for the parameters not measured directly.

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Mid-latitude and plasmaspheric hiss: A review

Cited by 118 publications

References 91 publications

Modeling whistler wave generation regimes in magnetospheric cyclotron maser

Modeling whistler wave generation regimes in magnetospheric cyclotron maser

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

Quasi-periodic ELF/VLF wave emissions in the Earth's magnetosphere: comparison of satellite observations and modeling

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