Empirical specification of field-aligned plasma density profiles for plasmasphere refilling

Details Empirical specification of field-aligned plasma density profiles for plasmasphere refilling Empirical specification of field-aligned plasma density profiles for plasmasphere refilling

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jgra..11106216t&link_type=abstract

Journal of Geophysical Research, Volume 111, Issue A6, CiteID A06216

Physics

11

Magnetospheric Physics: Magnetosphere: Inner, Magnetospheric Physics: Plasmasphere, Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Numerical Modeling

Scientific paper

Sounding measurements from the radio plasma imager (RPI) on the IMAGE satellite are used to derive electron density distributions along magnetic field lines in the nightside plasmasphere and plasmatrough for three midlatitude passes. These passes occurred during (1) a magnetic storm, (2) a prolonged quiet time, and (3) a sudden commencement of a storm, respectively. It is found that the density profiles of filled (in the inner plasmasphere) and depleted (in the plasmatrough or outer plasmasphere) flux tubes have different field line dependence. A multivariant least squares fit with a simple analytical function is used to model the density profiles. The fitting parameters in the function define the field line dependence of a density profile, i.e., the steepness of the density profile at high latitudes and the flatness at low latitudes. In each pass the density profiles along the filled and depleted flux tubes can be well modeled with the selected functional form, with two different sets of fitting parameter values for filled and depleted flux tubes. For the three passes examined, the fitting parameter values are not sensitive to the geomagnetic activity for the inner plasmasphere density profiles but vary slightly for the plasmatrough or outer plasmasphere density profiles from case to case. The equatorial densities extrapolated from the measured density profiles approximately have a power law relation with L values. The results suggest that the selected function has potential of being able to construct realistic global empirical plasmasphere/plasmatrough models. Furthermore, it is now feasible to empirically determine the density profiles along the depleted flux tubes for plasmasphere refilling studies.

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