Radial and Meridional Trends in Solar Wind Thermal Electron Temperature and Anisotropy: ULYSSES
Forsyth, R. J.; Bame, S. J.; Scime, E. E.; Phillips, J. L.; Gosling, J. T.; Gary, S. P.
United States, United Kingdom
Abstract
Ulysses plasma measurement from 1.15 to 5.31 AU and from S6.4° to S48.3° solar latitude are used to assess the trends in the solar wind thermal electron temperature and anisotropy. Improved spacecraft potential corrections and data products have been incorporated. The radial temperature gradient is steeper than in previous determinations, but flatter than adiabatic. When normalized to 1 AU, temperature decrease with increasing latitude. Little change in the average thermal anisotropy has been seen during the mission.