Computer Science
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt........52k&link_type=abstract
Thesis (PH.D.)--THE JOHNS HOPKINS UNIVERSITY, 1992.Source: Dissertation Abstracts International, Volume: 53-01, Section: B, page
Computer Science
Scientific paper
The hot ion angular anisotropies measured by the Low Energy Charged Particle (LECP) instrument on the Voyager 2 spacecraft during the encounter with the Jovian magnetosphere have been fitted to a 2 species convected kappa distribution using a least squares non-linear inversion technique. The coverage was from 30 keV-5 MeV in energy and from 60-30 R_{rm J} (inbound) and 70-130 R_{rm J} (outbound). Each species is allowed to have an individual temperature, density, and spectral index, but was required to share a common bulk flow velocity. The model distributions were fit to 8 non-compositional and 3 compositional channels of the LECP detector. Each channel has 7 usable angular look directions. Some of the resulting intensity distributions were found to contain primarily protons at low energy (30-200 keV) and heavy ions at high energy (200 keV-5 MeV). The bulk flow speeds were found to be generally sub-corotational and in agreement with the Voyager Plasma Science (PLS) results near 30 R _{rm J} on the dayside. The temperature of the heavy ions was found to increase with the corotation energy of heavy ions during the dayside encounter. The proton temperature was found to be constant for the same period. The energization of hot heavy ions to the local corotation energy fits naturally into the framework of a neutral wind model of radial plasma transport of heavy ions, producing a pickup ion source in the outer magnetosphere. A corotating convection pattern predicted by the magnetic anomaly model could not be found. In fact, the results presented herein, along with the PLS results, show that the plasma convection is not consistent with a simple inertial mass loading model of a corotating magnetosphere.
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