An empirical polytrope law for solar wind thermal electrons between 0.45 and 4.76 AU - Voyager 2 and Mariner 10

Details An empirical polytrope law for solar wind thermal electrons between 0.45 and 4.76 AU - Voyager 2 and Mariner 10 An empirical polytrope law for solar wind thermal electrons between 0.45 and 4.76 AU - Voyager 2 and Mariner 10

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.5131s&link_type=abstract

Journal of Geophysical Research, vol. 85, Oct. 1, 1980, p. 5131-5137.

Computer Science

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24

Interplanetary Space, Polytropic Processes, Satellite Sounding, Solar Electrons, Solar Wind, Thermal Plasmas, Electron Density Profiles, Mariner 10 Space Probe, Plasma Physics, Voyager 2 Spacecraft

Scientific paper

In this paper empirical evidence is presented that between 0.4 and 5 AU the thermal portion (but not all) of the solar wind electron population obeys a polytrope relation. It is also shown that this functional relationship is a member of a broader class of possible laws required of a steady state, fully ionized plasma whose proper frame electric field is dominated by the polarization electric field. The empirically determined, thermodynamically interesting value of the polytrope index (1.175) is virtually that predicted (1.16) by the theoretical considerations of Scudder and Olbert (1979). Strong, direct, empirical evidence for the nearly isothermal behavior of solar wind electrons as has been indirectly argued in the literature for some time is provided.

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