Fundamentals of Current Description
- Thomas A. Potemra
Published Online: 21 MAR 2013
Copyright 1984 by the American Geophysical Union.
How to Cite
Vasyliunas, V. M. (1984) Fundamentals of Current Description, in Magnetospheric Currents (ed T. A. Potemra), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM028p0063
- Published Online: 21 MAR 2013
- Published Print: 1 JAN 1984
Print ISBN: 9780875900551
Online ISBN: 9781118664131
- Magnetospheric currents—Congresses;
- Plasma instabilities—Congresses
Electrical currents, defined in terms of the net flux of charge transported by particles, deduced from the curl of the magnetic field in most of the observational work to date as well as in many theoretical contexts, are related to plasma dynamics both by the momentum equation and by the MHD connection between plasma flow and the magnetic field configuration (relations not easily representable by circuit analogies). The momentum equation provides directly an expression for the current density perpendicular to the magnetic field and, in combination with the current continuity equation, also provides an expression for the field-aligned gradient of the parallel (Birkeland) current density; these expressions are here given with all inertial and pressure anisotropy effects taken into account.