Development of a Climatological Model of Plasmaspheric Density at Geosynchronous Orbit

Details Development of a Climatological Model of Plasmaspheric Density at Geosynchronous Orbit Development of a Climatological Model of Plasmaspheric Density at Geosynchronous Orbit

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm42a..04w&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM42A-04

Mathematics

Logic

2722 Forecasting (7924, 7964), 2730 Magnetosphere: Inner, 2768 Plasmasphere

Scientific paper

The variability of plasmaspheric density structure at geosynchronous orbit is quantified by solar cycle, season, and local time. Seven years of in situ observations from 1997-2003 are examined using the Los Alamos National Laboratory magnetospheric plasma analyzer data set. Probability distribution functions of cold ion data are examined, and the 90th percentile density is chosen as a representative density for the plasmasphere in order to track density variability. Annual plasmaspheric densities are shown to be inversely proportional to annual geomagnetic activity, and an empirical relationship is derived. Month to month variability over the seven-year period is modeled with a Fourier series of the dominant frequencies, with the strongest peak being a one year cycle. Local time density structure is quantified based on geomagnetic activity and solar cycle as well. These results can be combined to give a detailed climatological model of the geosynchronous plasma environment, and the density structure at a given local time, month, and year can be predicted.

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