On the role of macroscopic resistive instabilities in the auroral Ionosphere-Thermosphere system

被引：1

作者：

Birk, GT ^{[1
]}

Otto, A

机构：

[1] Univ Munich, Inst Astron & Astrophys, D-81679 Munich, Germany

[2] Univ Alaska, Inst Geophys, Fairbanks, AK 99775 USA

来源：

COUPLING AND ENERGETICS IN THE STRATOSPHERE-MESOSPHERE-THERMOSPHERE-IONOSPHERE SYSTEM | 1997年 / 20卷 / 06期

基金：

美国国家航空航天局;

关键词：

D O I：

10.1016/S0273-1177(97)00791-6

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

During times of moderate and high magnetospheric activity the Earth's magnetic field is compelled into a sheared configuration by earthward convective hows of the magnetospheric plasma. If the plasma convection is too fast for the ionosphere to respond by a slippage of magnetic field lines, field-aligned currents associated with the magnetic shear may exceed a critical value and cause the formation of localized regions of anomalous dissipation. Thus, field-aligned electric fields can be supported and macroscopic resistive instabilities might develop. This scenario is simulated by means of a three-dimensional plasma-neutral gas-fluid code. Our results suggest that resistive instabilities operating in and above the topside ionosphere lead to the formation of extremely thin field-aligned layers of auroral luminosity caused by low energy electrons. Moreover, resistive instabilities result in localized plasma heating and may contribute to vertical plasma and neutral gas transport as well as the formation of ionospheric plasma and neutral gas vortices. (C) 1997 COSPAR. Published by Elsevier Science Ltd.

引用

页码：1301 / 1304

页数：4

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