HR: 0800h
AN: SM41C-1195    [Abstracts]
TI: On the Closure Relations for Multimoment Fluid Models of the Long-Range Potential in Downward Auroral Current Regions
AU: * Lund, E J
EM: Eric.Lund@unh.edu
AF: University of New Hampshire, Space Science Center, 39 College Rd., Durham, NH 03824 United States
AU: Jasperse, J R
EM: John.Jasperse@hanscom.af.mil
AF: Air Force Research Laboratory, 29 Randolph Rd., Hanscom AFB, MA 01731 United States
AU: Lynch, K A
EM: kristina.lynch@dartmouth.edu
AF: Dartmouth College, Department of Physics and Astronomy, 6127 Wilder Laboratory, Hanover, NH 03755 United States
AU: Carlson, C W
EM: cwc@ssl.berkeley.edu
AF: University of California, Space Sciences Laboratory, Berkeley, CA 94720 United States
AU: Bonnell, J W
EM: jbonnell@ssl.berkeley.edu
AF: University of California, Space Sciences Laboratory, Berkeley, CA 94720 United States
AU: Bouhram, M
EM: mehbouh@yahoo.fr
AF: CETP, 4, ave. Neptune, Saint-Maur, F-94100 France
AU: Grossbard, N J
EM: Neil.Grossbard@hanscom.af.mil
AF: Air Force Research Laboratory, 29 Randolph Rd., Hanscom AFB, MA 01731 United States
AU: Basu, B
EM: Bamandas.Basu@hanscom.af.mil
AF: Air Force Research Laboratory, 29 Randolph Rd., Hanscom AFB, MA 01731 United States
AU: Peterson, W K
EM: Bill.Peterson@lasp.colorado.edu
AF: University of Colorado, LASP, 1234 Innovation Dr., Boulder, CO 80303 United States
AU: Scudder, J D
EM: jds@space-theory.physics.uiowa.edu
AF: University of Iowa, Department of Physics and Astronomy, Van Allen Hall, Iowa City, IA 52240 United States
AB: Recently, we have developed a new fluid theory in the guiding center and gyrotropic approximation that includes the effect of wave-particle interactions for the turbulent, weakly inhomogeneous, non-uniformly magnetized plasma and is applicable to the field-aligned Birkeland current system of the earth's magnetosphere. It is assumed that the turbulence is random and electrostatic, and that the velocity-space Fokker-Planck operator can be used to calculate the correlation functions that describe the wave-particle interactions. This model uses satellite data as a boundary condition; we solve the fluid equations downward to the estimated double layer altitude and upward into the magnetosphere. The results of this calculation depend to a significant extent on how the system of equations is closed. We seek to verify the closure relations in our model by comparing the high-altitude predictions of a run based on FAST data at ~ 4000~km with measurements from Polar at ~ 8 R_E on nearly the same flux tube. We can run our model with different possible closures in order to see which one best predicts the high-altitude observations.
DE: 2483 Wave/particle interactions (7867)
DE: 2704 Auroral phenomena (2407)
DE: 2721 Field-aligned currents and current systems (2409)
DE: 2794 Instruments and techniques
DE: 7846 Plasma energization
SC: SPA-Magnetospheric Physics [SM]
MN: Fall Meeting 2005