Geophysical research letters, 2014-09, Vol.41 (17), p.6071-6077
2014
Details
- Autor(en) / Beteiligte
- Titel
- A unified model of auroral arc growth and electron acceleration in the magnetosphere-ionosphere coupling
- Ist Teil von
- Geophysical research letters, 2014-09, Vol.41 (17), p.6071-6077
- Ort / Verlag
- Washington: Blackwell Publishing Ltd
- Erscheinungsjahr
- 2014
- Link zum Volltext
- Quelle
- Wiley Online Library
- Beschreibungen/Notizen
- A unified physical model of auroral arc growth and electron acceleration is constructed from the gyrokinetic and two‐fluid equations for the magnetosphere‐ionosphere (M‐I) coupling system. The present theory describes destabilization of kinetic Alfvén waves (KAWs) in the M‐I coupling, where development of upward and downward field‐aligned currents carried by the KAWs leads to ionospheric density enhancement and depletion, respectively. The feedback M‐I coupling through KAWs elucidates growth of auroral arcs and field‐aligned acceleration of electrons self‐consistently and provides a possible explanation to the Alfvénic auroras observed by the FAST spacecraft. Key PointsA kinetic model of magnetosphere‐ionosphere coupling is constructedAuroral growth, KAW excitation, and electron acceleration are unified by theoryThe feedback coupling via KAWs possibly explains the Alfvén aurora
- Sprache
- Englisch
- Identifikatoren
- ISSN: 0094-8276eISSN: 1944-8007DOI: 10.1002/2014GL061166Titel-ID: cdi_proquest_miscellaneous_1618148890
- Format
- –
- Schlagworte
- Acceleration, Alfven waves, Alfvénic aurora, Alignment, Auroral arcs, auroral growth, Auroras, Construction, Coupling, Density, Depletion, Destabilization, Electron acceleration, Electrons, Feedback, feedback instability, Growth, gyrokinetics, Ionosphere, Joining, kinetic Alfvén wave, Kinetics, Magnetic fields, Magnetosphere, Magnetosphere-ionosphere coupling, Magnetospheres, Mathematical models, Spacecraft, Waves