Effects of spacecraft potential on three-dimensional electron measurements in the solar wind

Details Effects of spacecraft potential on three-dimensional electron measurements in the solar wind Effects of spacecraft potential on three-dimensional electron measurements in the solar wind

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9914769s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A8, p. 14,769-14,776

Physics

25

Current Density, Electron Distribution, Electron Energy, Solar Wind, Spacecraft Charging, Three Dimensional Flow, Anisotropy, Electron Spectroscopy, Magnetic Fields, Mathematical Models, Ulysses Mission

Scientific paper

Using the three-dimensional, low-energy electron spectrometer aboard the Ulysses spacecraft, we have measured the gyrotropicity of electron distributions in the solar wind. In order to make these observations, we have developed a new technique for correcting spacecraft charging effects in three-dimensional, low-energy particle measurements. Comparisons of ion and electron number and current densities, and the alignment of electron temperature anisotropies with the local magnetic field, are presented as evidence of the improvement in the accuracy of the electron moments resulting from the spacecraft charging corrections. The implications of our charging correction technique go beyond simple scalar corrections to the Ulysses measurements. We discuss the effects of our charging correction upon the measurements of temporal and radial gradients in a plasma environment and for two-dimensionally obtained low-energy particle data.

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