Physics – Plasma Physics
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...10422511g&link_type=abstract
Journal of Geophysical Research, Volume 104, Issue A10, p. 22511-22524
Physics
Plasma Physics
5
Ionosphere: Auroral Ionosphere, Ionosphere: Ionosphere/Magnetosphere Interactions, Space Plasma Physics: Numerical Simulation Studies, Space Plasma Physics: Transport Processes
Scientific paper
Recent observations from the Freja and FAST satellites as well as earlier observations from OGO 5, Heos 2, and DE 2 indicate the presence of fine structures in the field-aligned plasma flows. We have simulated the effects of such structures on ionospheric plasma transport processes, using our three-dimensional large-scale, multimoment, multifluid model. The model solves the continuity, momentum and double adiabatic energy equations with anisotropic ion temperatures in the field line coordinates from 1500 km to 10 RE. It includes important physics of the ionosphere-magnetosphere coupling region, such as the mirror force and generalized ambipolar electric field in a dipole magnetic field geometry. Freja satellite observations of the structured field-aligned currents were used as input parameters in the simulation. It has been shown that in the presence of the field-aligned current filaments with sufficiently small transverse scale sizes, the transverse transport can play a dominant role in the overall plasma response processes in the ionosphere-magnetosphere coupling region. For example, the local changes in parallel flow velocity due to transverse transport, 1 min after the structured field-aligned current application, may be >30%. The plasma response time due to transverse transport has been found to be shorter than that due to parallel transport. The difference is more pronounced at higher altitudes.
Ganguli Supriya B.
Gavrishchaka Valeriy V.
Guzdar Parvez N.
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