The local-time dependence of the quiet-time outer plasmaspheric density*

Details The local-time dependence of the quiet-time outer plasmaspheric density* The local-time dependence of the quiet-time outer plasmaspheric density*

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm52d07r&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM52D-07

Physics

2443 Midlatitude Ionosphere, 2481 Topside Ionosphere, 2768 Plasmasphere

Scientific paper

We use the past 11 years of density measurements by the LANL geosynchronous satellites to evaluate the plasma density as a function of local time during periods of low Kp. Previously, the daily-averaged refilling rate has been measured during these quiet periods [Lawrence et al., JGR, 1999; Su et al., JGR, 2001]. The diurnal variation, however, is sufficiently strong to be detectable even during refilling, which is characterized by a monotonically increasing density (averaged daily). We find a strong 24-hour variation (approximately 15%) in the density and a somewhat weaker 12-hour variation (less than 5%). The higher harmonics are within the statistical noise. These results are compared with the prediction of a kinetic model [Reynolds et al., JGR, 1999] and give a quiet-time structure of the outer plasmasphere that is useful as a starting point for dynamical, storm-time calculations. In addition, these observations place limits on the maximum local time variation of the exobase in the range 60-70 degrees magnetic latitude (the footpoints of dipole field lines at geosynchronous orbit). *This work is supported by ONR and NASA.

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