The Electron Density in the Jovian Magnetosphere from Galileo Plasma Wave Measurements

Details The Electron Density in the Jovian Magnetosphere from Galileo Plasma Wave Measurements The Electron Density in the Jovian Magnetosphere from Galileo Plasma Wave Measurements

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm31c1126r&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM31C-1126

Physics

2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2772 Plasma Waves And Instabilities

Scientific paper

An overview of Jovian magnetospheric electron density is presented from data gathered by the Galileo plasma wave instrument. Two techniques are employed. The first uses the low-frequency cutoff of trapped continuum radiation existing at the local electron plasma frequency, f p = 8980 √ {(N e}) Hz, where N{ e} is the electron density in cm-3. The second uses a narrowband emission at the upper hybrid resonance frequency, f uh = √ {(fp2 + fc2)}, where f c = 28B Hz defines the electron cyclotron frequency, and is primarily used inside approximately 15 R J, where the first method fails. Analyzed data covers between December 1995 and November 2002. Covered radial distances range approximately from 4 R J, near the inner edge of the cold torus, to 145 R J, and local times approximately extend from 0400 hours local morning to 2000 hours local evening via local midnight. Electron densities vary from approximately 4 x 103 cm-3 in the Io torus' most dense region to 10-2 cm-3 in the distant magnetotail. The radial electron density profile has a distinct break at approximately 25 R J and varies as approximately (1/R)6.5 inside 25 R J and (1/R)2.1 beyond 25 R J. The north-south thickness of the plasma sheet is usually well resolved at radial distances from 25 R J to 50 R J, and is typically within the range of 4 to 8 R J. The plasma sheet broadens considerably, however, beyond 50 R J to an irresolvable state. Efforts are currently focused on investigating the local time dependence of the plasma sheet thickness.

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