Electron number density fluctuations near the plasmapause observed by the CRRES spacecraft

Details Electron number density fluctuations near the plasmapause observed by the CRRES spacecraft Electron number density fluctuations near the plasmapause observed by the CRRES spacecraft

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9923661l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A12, p. 23,661-23,671

Physics

41

Electron Density (Concentration), Magnetohydrodynamic Turbulence, Plasma Frequencies, Plasmapause, Plasmasphere, Power Spectra, Variations, Crres (Satellite), Earth Magnetosphere, Geomagnetism

Scientific paper

Large quasi-periodic fluctuations in the electron number density are often encountered near and inside the plasmapause by the Combined Release and Radiation Effects Satellite (CRRES) satellite. A power spectral analysis reveals electron density fluctuations wit frequencies ranging from 2 mHz to approximately 61 mHz. Plasma density irregularities in the outer plasmasphere sometimes have power spectral slopes near -5/3, which suggest the presence of well-developed two-dimensional magnetohydrodynamic turbulence. Quasi-periodic fluctuations have been found outside the plasmasphere with spatial scales along the orbit path of approximately 750 km. A statistical analysis shows that the density fluctuations amplitudes are largest between L = 3 and L = 6, the region in which the plasmapause is located. The density fluctuations amplitudes decrease with increasing L shell for L less than 6. Normalized fluctution amplitudes greater than 10% are found in only 25% of the available data of this study. A significant magnetic local time dependence cannot be found due to incomplete data availability during the 9.00 to 14.99 Magneitc Local Time (MLT) and the 15.00 to 20.99 MLT sectors.

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