Other
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.6285l&link_type=abstract
Journal of Geophysical Research, Vol. 95, No. A5, p. 6285 - 6304
Other
Comet 1986 Iii Halley, Cometary Comae: Electron Temperatures, Cometary Comae: Models
Scientific paper
A quasi-two-dimensional model of the spatial and energy distribution of electrons in the inner coma of comet Halley has been constructed from a spherically symmetric ion density profile based on Giotto measurements, using the two-stream electron transport method and the time-dependent electron energy equation. A variety of heating and cooling processes were included, such as cooling via rotational, vibrational, and electronic excitation of water vapor due to electron impact. A sharp jump in the electron temperature was found to be present at a cometocentric distance of about 15,000 km. This thermal boundary separates an inner region where cooling processes are dominant from an outer region where heat transport is more important. Both thermal (Te less than about 104K) and suprathermal electron populations exist inside the thermal boundary with comparable kinetic pressures. Outside the thermal boundary, a cold electron population does not exist, and the electrons are almost isothermal along the magnetic field lines.
Cravens Thomas E.
Lu Gan
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