Substorm aspects of magnetic pulsations

Gendrin, R.

doi:10.1007/bf00174429

Cited by 86 publications

(30 citation statements)

References 107 publications

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“…Using the data of dispersion of Pcl pulsations and, in some cases lpdp as well, we may estimate the plasma density in the region of generation and the energy of the resonance particles. The corresponding methods and results of the diagnostics are well known (see [1][2][3][4][5][6][7][8][9]). We shall discuss some new possibilities arising when considering nonstationary spectrum of hydromagnetic emissions.…”

Section: Nonstationary Processesmentioning

confidence: 99%

“…In recent years the methods and results of the hydromagnetic diagnostics of the near Earth plasma have been widely discussed in literature and on International Conferences (see, for example, surveys of Troitskaya and Gul'elmi [1][2][3][4], Gendrin [5], Saito [6], Anbry [7], monographs of Jacobs [8] and Gul'elmi and Troitskaya [9]). In the presented report, therefore I am not giving a detailed presentation of wellknown results.…”

Section: Introductionmentioning

confidence: 99%

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Diagnostics of the magnetosphere and interplanetary medium by means of pulsations

Gulelmi¹

1974

Space Sci Rev

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The possibility of diagnostics of the interplanetary magnetic field using the data of ground observations of Pc3, 4 pulsations is investigated. Both empirical and theoretical foundations of this method are discussed. In the shorter-period range (Pcl, Pil, Ipdp) the methods of qualitative diagnostics of non-stationary processes in the quiet and disturbed magnetosphere are considered. In conclusion, we shall briefly consider the problems, arising when estimating the amplitude of the hydromagnetic waves in the regions of generation.

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Section: Nonstationary Processesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diagnostics of the magnetosphere and interplanetary medium by means of pulsations

Gulelmi¹

1974

Space Sci Rev

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“…6, the nightside source distribution in a smaller L region appear to fit to a boundary of the plasmasphere bulge. It has been shown that the evening plasmapause region is the most favorable region where IPDP's are generated (GENDRIN, 1971;CORNWALL et al, 1970). Protons in a wide energy range are easy of access to the evening plasmapause region, because lower energy protons come from the injection boundary in the night sector and higher energy portions from the early morning sector (EJIRI, 1978).…”

Section: Distribution Of Ipdp Source Regionmentioning

confidence: 99%

“…Assuming the proton cyclotron instability of LH poralized HM waves as the origin of IPDP, several mechanisms have been proposed to explain the upward frequency shift of IPDP's: energy-dispersion effect , viz., earlier arrival of higherenergy protons in the dusk sector resonating with lower frequency waves , provided with protons injected in the night sector at the onset of magnetospheric substorm (FUKUNISHI, 1969); an increase of the local gyrofrequency caused by the earthward motion of an instability region associated with an enhancement of convective electric fields (GENDRIN et al,1967); temporal increase of gyrofrequency due to enhancement of magnetic fields intensity during substorm (ROXBURGH , 1970).…”

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confidence: 99%

Multi-station observation of IPDP micropulsations - Two-dimensional distribution and evolution of the source regions.

Hayashi

Yamamoto

Kokubun

et al. 1988

J. geomagn. geoelec

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Short period geomagnetic pulsations called IPDP (intervals of pulsations of diminishing periods) are investigated, using ground data obtained at 35 campaign stations in the northern polar region. Comparison of the frequency-time (f-t) spectrograms of data from the stations shows that the internal structures of f t pattern of IPDP pulsations vary with a small separation between stations. The variability of the internal structures suggests that "an IPDP event" consists of many discrete wave packets each of which comes from individual sources. Spatial-temporal developments of IPDP wave power are also examined. The two-dimensional distribution of IPDP power is both highly structured in space, suggesting presence of discrete source regions, and also highly variable with time, indicating characteristic dynamic features of the source regions. The source regions are located in the dusk half of the magnetosphere in a range of L value from 4 to 10. Three types of dynamics of the source regions are found; 1) fast westward motion consistent with magnetic-drift velocity of 60-70keV protons in the magnetosphere, 2) quasi-stationary sources, which are almost stationary in the magnetospheric frame for periods longer than 10 minutes, 3) evolution of the IPDP region toward the night and earthward with increase in center frequency. When the westward moving sources arrive at the location of the stationary sources, they merge with them and do not go further westward beyond the stationary sources. These time developments of the IPDP source regions comprehensively explain most of the IPDP characteristics so far obtained from observations in a limited area. Not only well-defined IPDP's but also 583

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“…It is especially true that the fundamental mechanism responsible for the frequency increase exhibited in the dynamic spectrum remains to be solved. Several models have been proposed to explain the frequency increase of IPDP plasma wave events: (1) Earthward source movement due to E x B drift causes an increase of the observed frequency in the IPDP plasma wave events (Troitskaya et al, 1968;Gendrin, 1970;Heacock et al, 1976;Kangas et al, 1988). (2) The differential drifting velocity of injected protons leads to an earlier arrival of higher energy protons at the duskside bulge region, which in turn causes the frequency increase of IPDP plasma wave events (Fukunishi, 1969).…”

Section: Introductionmentioning

confidence: 99%

IPDP Plasma Wave Events Observed in Association with Low Latitude Auroras.

Higuchi

1995

J. geomagn. geoelec

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A case study of IPDP (Intervals of Pulsations of Diminishing Period) observed in association with low-latitude auroras is reported. Visible red auroras were detected twice in the time intervals of 11 h36m-12h30m UT and l4h10m-14h30m UT on October 21, 1989. Simultaneously there were two rapid northward excursions of the H-component magnetic perturbation with the magnitude of more than 150 nT. The IPDP plasma wave events were observed at Yonezawa during the low-latitude auroras. The energy source of the IPDP plasma wave event is inferred to be the wave-particle interaction involving the asymmetric ring current oxygen ions at the bulge region of the plasmapause during the expansive phase of substorms. The frequency increase is explained in terms of a decrease of energy of the oxygen ion stream while the asymmetric ring current decays.

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Substorm aspects of magnetic pulsations

Cited by 86 publications

References 107 publications

Diagnostics of the magnetosphere and interplanetary medium by means of pulsations

Diagnostics of the magnetosphere and interplanetary medium by means of pulsations

Multi-station observation of IPDP micropulsations - Two-dimensional distribution and evolution of the source regions.

IPDP Plasma Wave Events Observed in Association with Low Latitude Auroras.

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