Satellite observations of an ionospheric acceleration mechanism

Shelley, E. G.; Sharp, R. D.; Johnson, R. G.

doi:10.1029/gl003i011p00654

Cited by 455 publications

(193 citation statements)

References 5 publications

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“…Observations from a number of spacecraft have shown the presence of energetic particles in the magnetospheric cusp (Shelly et al, 1976;Kremser et al, 1995;Chen et al, 1997;Pfaff et al, 1998;Savin et al, 2002); however, their source remains a matter of scientific discussion and debate. The polar cusp region, where these particles are observed, is idenCorrespondence to: B. M. Walsh (bwalsh@bu.edu) tified by a minimum local magnetic field (Ferrell and Van Allen, 1990) and an increased magnetosheath plasma (Frank, 1971).…”

Section: Introductionmentioning

confidence: 99%

Energetic particles observed by ISEE-1 and ISEE-2 in a cusp diamagnetic cavity on 29 September 1978

et al. 2007

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Abstract.Observations by the ISEE-1 and ISEE-2 spacecraft on 29 September 1978 show large CEP (Cusp Energetic Particle) fluxes while passing through the dayside magnetospheric cusp in near coincident orbits. The event was observed around 11:00 MLT between roughly 12:30 and 13:00 UT by ISEE-1 and 12:00 and 13:00 UT by ISEE-2. During these periods, both electron and ion fluxes increased by more than two orders of magnitude, with the electron flux showing a strong peak at a pitch angle of 90 • . The solar wind was ∼710 km s −1 and the Dst was ∼-200 nT, suggesting the occurrence of a strong geomagnetic storm. The ISEE-1 and ISEE-2 observations, however, show no time-energy dispersion of the CEPs, leading us to believe that these particles could not be the result of substorm processes in the magnetotail. The local magnetic field was depressed and extremely turbulent. Changes in the magnitude of the magnetic field anticorrelate closely to variations of the electron flux. The observations in electron flux peaking at 90 • and the close anticorrelation between the local magnetic field strength and electron flux are unique and provide evidence of a potential local source for these energetic particles.

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Section: Introductionmentioning

confidence: 99%

Energetic particles observed by ISEE-1 and ISEE-2 in a cusp diamagnetic cavity on 29 September 1978

et al. 2007

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“…Experimental evidence for perpendicular ion acceleration (ion conics) has been accumulated from at least four magnetospheric satellites and two sounding rockets (Shelley et al, 1976;Sharp et al, 1977;Klumpar, 1979;Horwitz, 1980;Whalen et al, 1978, Yau et al, 1982. In contrast there exists scant evidence for the mechanism that produces perpendicular ion acceleration.…”

Section: Introductionmentioning

confidence: 99%

A search for the plasma processes associated with perpendicular ion heating

Kintner¹,

Gorney²

1984

J. Geophys. Res.

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“…We now turn our attention to the lower energy ions. Existence of cold ions of ionospheric origin is proved to be a semi-persistent feature in the tail lobe (Shelley et al, 1976;Frank et al, 1977;Hardy et al, 1977;Sharp et al, 1981;Mukai et al, 1994). We expect that the motions of these cold ions are significantly perturbed during the magnetically disturbed period.…”

Section: Introductionmentioning

confidence: 99%

The Energization of Cold Ions around a Plasmoid in the Magnetotail.

Tsubouchi

Terasawa

1995

J. geomagn. geoelec

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We study numerically the interaction of cold ionospheric ions in the tail lobe with a plasmoid propagating steadily in the tailward direction. We have found that significant energization of cold ions occurs at the encounter with a plasmoid, where three types of the interaction processes are taking place: First, ions show gradient and curvature drift motions as the plasmoid approaches. These ions are accelerated up to -1 keV by the cross-tail electric field accompanying with the plasmoid motion (type-I energization). Second, some of the ions get large pitch angles after the type-I acceleration, and then mirror reflected by the plasmoid. These ions are accelerated up to 10 keV after the reflection (type-II energization). Third, the motions of the ions near the plasmoid become highly non-adiabatic, because their gyroradii become comparable to the field-line curvature radius after the type-I energization. Consequently the energy distribution of these ions is broadened in the trailing side of the plasmoid (type-III energization). These theoretical results are successfully compared with the recent GEOTAIL observation showing the dynamic interaction of cold ions with a plasmoid and their subsequent energization.

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Satellite observations of an ionospheric acceleration mechanism

Cited by 455 publications

References 5 publications

Energetic particles observed by ISEE-1 and ISEE-2 in a cusp diamagnetic cavity on 29 September 1978

Energetic particles observed by ISEE-1 and ISEE-2 in a cusp diamagnetic cavity on 29 September 1978

A search for the plasma processes associated with perpendicular ion heating

The Energization of Cold Ions around a Plasmoid in the Magnetotail.

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