Very low frequency (VLF) chorus emissions: A topical survey

Kulkarni, V. H.; Das, Jharana

doi:10.1007/bf01901950

Cited by 3 publications

(1 citation statement)

References 45 publications

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“…The aim of this study is to analyze the variety of chorus and chorus‐like emissions observed by the ionospheric satellite DEMETER (Detection of Electro‐Magnetic Emissions Transmitted from Earthquake Regions). Chorus emissions are intense whistler‐mode waves consisting of a series of rising or falling tones in frequency and separated by a few tenths of seconds (see reviews by Kulkarni and Das [], Sazhin and Hayakawa [], Santolik [], and Tsurutani et al . [], and references therein).…”

Section: Introductionmentioning

confidence: 99%

Chorus and chorus‐like emissions seen by the ionospheric satellite DEMETER

2016

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A lot of different emissions have been detected by the low‐altitude satellite DEMETER (Detection of Electro‐Magnetic Emissions Transmitted from Earthquake Regions), and the aim of this paper is to study extremely low frequency (ELF) electromagnetic waves with elements drifting in frequency. It is shown that only some of them can be considered as usual chorus. These chorus elements are emitted in the equatorial plane, and their propagation analysis indicates that they are going downward at low altitudes in the ionosphere to be detected by the satellite. The study of one remarkable event recorded along the same orbit in both the Northern and the Southern Hemispheres on 8 May 2008 indicates that this propagation mechanism is reinforced at the location of the ionospheric trough, which corresponds to the plasmapause at higher altitudes. It has been observed that usual chorus elements at low frequencies are always in a frequency band which overlaps with a hiss band limited by a frequency cutoff close to the proton gyrofrequency. Other drifting elements can be attributed to emissions triggered by PLHR (power line harmonic radiation). It means that without a high‐resolution spectral analysis, chorus‐like elements triggered by PLHR can be wrongly considered as natural chorus. These drifting elements can also appear as filamentary structures emerging at the upper frequencies of a hiss band or quasiperiodic emissions. There are events where the elements even have certain similarities to quasiperiodic emissions. The difference between these elements and the chorus emissions will be emphasized.

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Section: Introductionmentioning

confidence: 99%

Chorus and chorus‐like emissions seen by the ionospheric satellite DEMETER

2016

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Mid-latitude and plasmaspheric hiss: A review

Hayakawa

Sazhin

1992

Planetary and Space Science

118

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Electromagnetic electron cyclotron instability in a hot plasma having an electron current

Jayaraman

Kulkarni

1994

Phys. Scr.

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The presence of an electron current on the electromagnetic electron cyclotron instability due to temperature anisotropy of the background hot electrons is analysed. The growth rate depends on the strength of the electron current in the following way: (Author should give more details here in the abstract.) The application of the present study to the gap at p = in the equational magnetosphere suggest that the FAC must be of at least 1 pA/m2.

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Very low frequency (VLF) chorus emissions: A topical survey

Cited by 3 publications

References 45 publications

Chorus and chorus‐like emissions seen by the ionospheric satellite DEMETER

Chorus and chorus‐like emissions seen by the ionospheric satellite DEMETER

Mid-latitude and plasmaspheric hiss: A review

Electromagnetic electron cyclotron instability in a hot plasma having an electron current

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