Electric fields in the Earth's magnetosphere and ionosphere

Gurevich, A. V.; Крылов, А. Л.; Tsedilina, E. E.

doi:10.1007/bf00215629

Cited by 49 publications

(18 citation statements)

References 30 publications

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“…In addition, this enhanced electric field evolves quickly after an injection, so that the field, initially westward, turns to the radial (poleward) direction. Thus, in fact, it is a manifestation of the shielding process that reduces the external electric field penetration deep in the inner magnetosphere which was considered by many authors (see, for example, Jaggi and Wolf, 1973;Gurevich et al, 1976).…”

Section: Discussionmentioning

confidence: 99%

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Polarization Jet: characteristics and a model

Galperin

2002

Ann. Geophys.

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Abstract. Recent analysis of the ground-based observations of the Polarization Jet (PJ) effects in the subauroral ionosphere has shown that PJ can rapidly develop in the nearmidnight sector near the Harang Discontinuity (HD). Based on these observations, a simple, semi-quantitative theory of the PJ formation and its main characteristics is constructed. According to the model, PJ starts to develop, as proposed by Southwood and Wolf, 1978, due to the penetration of the injected energetic ions to the deeper L-shells in the presence of the westward component of the electric field. The injection near the tip of the HD is assumed here. The initial development stage of the PJ band, considered only qualitatively, is supposed to lead to its inclination inward toward evening with respect to the lines B = const. Within the model proposed, the PJ band, once formed, will be sustained by the continuous charging at its equatorial side, at first, mainly by the newly injected ring current ions, and later by the plasma sheet ions convected inward through the HD. In addition, an important charging of the PJ band occurs at its polar side by energetic electrons drifting eastward. These electrons were either previously on the trapped orbits or convected inward from the plasma sheet, and encounter the PJ polar border. The model semi-quantitatively describes the main features of the PJ events: the typical cross-PJ voltage drop (∼ 10 kV), the resulting double-sheet current loop feeding the PJ, the recently observed short PJ formation time near midnight (∼ 10 min or less) accompanied by a fast westward HD displacement, the nearly steady-state PJ location in the evening to midnight MLT sector and width in the ionospheric frame, the bell-shape of the electric field latitude profile, and the long PJ lifetime (up to several hours) -all are in rough accord with observations. Further developments of the model now in progress are briefly described.

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Section: Discussionmentioning

confidence: 99%

“…Evidently, a much more elaborate theory and modelling is needed for a comprehensive description of the particle injection phenomena in the inner magnetosphere during disturbed times, probably among the ways described by Gurevich et al (1976).…”

Section: Discussionmentioning

confidence: 99%

Polarization Jet: characteristics and a model

Galperin

2002

Ann. Geophys.

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“…While this short review of recent developments in our knowledge of electric fields in the high latitude magnetosphere and ionosphere is somewhat brief, the reader may refer to reviews by GUREVICH et al (1976), MOZER (1976b), andSTERN (1977) for more detailed discussions.…”

Section: High Latitude Electric Fieldsmentioning

confidence: 99%

Electric and magnetic fields in the ionosphere and magnetosphere.

Rostoker

1978

J. geomagn. geoelec

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Recent observations of electric fields in the ionosphere using various measurement techniques have led to important advances in the understanding of magnetosphere-ionosphere coupling. In particular the discovery of evidence for parallel electric fields in the altitude range 2,000-10,000 km has an important impact on the question of auroral acceleration processes. More detailed mapping of large scale field-aligned current configurations on field lines penetrating the auroral oval are leading to more complete models for the generator processes in the outer magnetosphere which are associated with energy dissipation in the near-earth environment. Recent observations of significant electric fields equatorward of the auroral oval indicate that significant interaction between the magnetosphere and ionosphere takes place outside of the auroral oval. New techniques are presently being developed for more quantitative studies of magnetosphere-ionosphere coupling.

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“…Such an approach to modeling the electric field in the Earth's ionosphere has long been known and is used by many researchers. This approach has been described in many monographs (e.g., Gurevich et al, 1976;Volland, 1984).…”

Section: Statement Of the Problem And The Brief Description Of The Modelmentioning

confidence: 98%