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| Titel |
Transport of thermal plasma above the auroral ionosphere in the presence of electrostatic ion-cyclotron turbulence |
| VerfasserIn |
V. E. Zakharov, C.-V. Meister |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 17, no. 1 ; Nr. 17, no. 1, S.27-36 |
| Datensatznummer |
250013642
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| Publikation (Nr.) |
 copernicus.org/angeo-17-27-1999.pdf |
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| Zusammenfassung |
The electron component of intensive electric
currents flowing along the geomagnetic field lines excites turbulence in the
thermal magnetospheric plasma. The protons are then scattered by the excited
electromagnetic waves, and as a result the plasma is stable. As the electron and
ion temperatures of the background plasma are approximately equal each other,
here electrostatic ion-cyclotron (EIC) turbulence is considered. In the
nonisothermal plasma the ion-acoustic turbulence may occur additionally. The
anomalous resistivity of the plasma causes large-scale differences of the
electrostatic potential along the magnetic field lines. The presence of these
differences provides heating and acceleration of the thermal and energetic
auroral plasma. The investigation of the energy and momentum balance of the
plasma and waves in the turbulent region is performed numerically, taking the
magnetospheric convection and thermal conductivity of the plasma into account.
As shown for the quasi-steady state, EIC turbulence may provide differences of
the electric potential of ΔV≈1–10 kV at altitudes of
500 < h < 10 000 km above the Earth's surface. In the turbulent
region, the temperatures of the electrons and protons increase only a few times
in comparison with the background values.
Key words. Magnetospheric physics (electric fields;
plasma waves and instabilities)
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