Determination of electron polytropic indices in the environment of Comet P/Halley

Details Determination of electron polytropic indices in the environment of Comet P/Halley Determination of electron polytropic indices in the environment of Comet P/Halley

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..157m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 2, p. 157-160.

Physics

7

Collisionless Plasmas, Cometary Atmospheres, Electron Density (Concentration), Electron Pressure, Halley'S Comet, Polytropic Processes, Giotto Mission, Plasmas (Physics), Space Plasmas, Comets, Halley, Plasma, Density, Pressure, Techniques, Giotto Mission, Spacecraft Observations, Theoretical Studies, Electrons, Rpa Instrument, Magnetic Field, Strength, Mag Instrument, Analysis, Magnitude, Experiments, Comparisons

Scientific paper

We present a general experimental method to investigate the relations between the density variations and the pressure variations for one particle population of a hot collisionless plasma. A complete description is provided of the data analysis technique for an experimental case, from Giotto electron and magnetic field data measured in the environment of Comet P/Halley, used to verify the theory. The correlations between the electron characteristics, density and pressures, and the magnetic field strength are investigated. In this case, the method shows that the relation between the electron density and pressures can be satisfactorily represented by two polytropic laws. The values inferred for the polytropic indices strongly differ from those usually found in the literature but are nevertheless fully quantitatively explained from the theoretical analytical calculations.

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