Soft electrons as a possible heat source for Jupiter's thermosphere

Details Soft electrons as a possible heat source for Jupiter's thermosphere Soft electrons as a possible heat source for Jupiter's thermosphere

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977p%26ss...25..817h&link_type=abstract

Planetary and Space Science, vol. 25, Sept. 1977, p. 817-821.

Physics

Plasma Physics

9

Electron Energy, Heat Sources, Jupiter Atmosphere, Thermosphere, Atmospheric Heating, Atmospheric Physics, Ionospheric Temperature, Planetary Ionospheres, Plasma Physics, Radio Occultation

Scientific paper

The 850 K exospheric temperature inferred for Jupiter from the radio-occultation experiments on Pioneers 10 and 11 is shown to imply a heat input of 0.25-0.5 erg/sq cm/sec. One possible source of this energy is precipitation of electrons from a warm plasma (temperature corresponding to energies of the order of 30-500 eV). A mechanism is suggested wherein the presence of this plasma can be accounted for by centrifugal acceleration and adiabatic compression of ionospheric electrons and protons. Present ideas of the source strength of ionospheric plasma, however, give heating rates that are too small by one to two orders of magnitude, although inferences from direct plasma measurements suggest that the required plasma is indeed present.

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