Formation of Auroral Arcs and Inverted V Precipitations: An Overview
- S.-I. Akasofu and
- J.R. Kan
Published Online: 26 MAR 2013
Copyright 1981 by the American Geophysical Union.
Physics of Auroral Arc Formation
How to Cite
Kan, J. R. and Lee, L. C. (1981) Formation of Auroral Arcs and Inverted V Precipitations: An Overview, in Physics of Auroral Arc Formation (eds S.-I. Akasofu and J.R. Kan), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM025p0206
- Published Online: 26 MAR 2013
- Published Print: 1 JAN 1981
Print ISBN: 9780875900506
Online ISBN: 9781118664360
- Auroras—Addresses, essays, lectures
Recent theoretical developments on the formation of discrete auroras are reviewed to assess the progress of our understanding of discrete auroral phenomenon. In spite of the great complexity involved, a unified physical picture begins to emerge in which the roles of various auroral acceleration processes can be identified in the context of magnetosphere-ionosphere coupling. Potential drops for the formation of inverted V precipitations are supported predominantly by a combination of double layer and pitch-angle anisotropy processes. Additional electron energizations for the formation of thin auroral arcs are most likely due to filamentations of electrostatic ion cyclotron turbulence along the inverted V field lines. The discrete auroras can be understood as a manifestation of the imperfect coupling state of the magnetosphere-ionosphere interaction due to enhanced magnetospheric convection.