An approximate description of field-aligned currents in a planetary magnetic field

Details An approximate description of field-aligned currents in a planetary magnetic field An approximate description of field-aligned currents in a planetary magnetic field

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96...67s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Jan. 1, 1991, p. 67-75.

Physics

26

Collisionless Plasmas, Field Aligned Currents, Planetary Magnetic Fields, Planetary Magnetospheres, Plasma Currents, Magnetic Field Configurations, Pressure Gradients, Solar Wind

Scientific paper

Expressions are derived that describe the time evolution of field-aligned (or Birkeland) currents in collisionless magnetized regions such as the magnetosphere and the solar wind. It is shown that, in a collisionless plasma, two important categories of field-aligned currents exist: Alfvenic and interchange. The Alfvenic field-aligned currents are driven by perpendicular inertial currents, while the interchange field-aligned currents are driven by pressure gradients.

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