Pressure-balanced structures between 1 AU and 24 AU and their implications for solar wind electrons and interstellar pickup ions

Details Pressure-balanced structures between 1 AU and 24 AU and their implications for solar wind electrons and interstellar pickup ions Pressure-balanced structures between 1 AU and 24 AU and their implications for solar wind electrons and interstellar pickup ions

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.2229b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, March 1, 1990, p. 2229-2239.

Physics

39

Heliosphere, Magnetic Flux, Radiation Pressure, Solar Electrons, Solar Wind, Electron Energy, Ion Density (Concentration), Magnetic Fields, Proton Density (Concentration), Voyager Project

Scientific paper

'Pressure-balanced structures' (PBSs) in the heliosphere are microscale phenomena with a characteristic length along the radial dimension of the order of 0.05 AU across which the sum of the thermal pressures and the magnetic pressure is constant. PBSs have been identified in the Voyager data from 1 AU to 24 AU. If the density of pickup ions were proportional to the proton density across a PBS, and if the electron pressure were negligible, then from measurements of the magnetic field and the proton density and temperature across pressure balanced structures a pickup ion density is derived which is significantly smaller than the density predicted by a model based on the same assumption. This suggests that there are processes which 'smear out' the pressure of the pickup ions so that it is nearly constant on the scale of a PBS. If the pressure of the pickup ions is uniform across a PBS, then one can determine the electron temperature from the pressure balance condition.

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