Properties of the solar wind electrons between 1.1 and 3.3 AU from Ulysses thermal noise measurements

Details Properties of the solar wind electrons between 1.1 and 3.3 AU from Ulysses thermal noise measurements Properties of the solar wind electrons between 1.1 and 3.3 AU from Ulysses thermal noise measurements

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..382..297m&link_type=abstract

Proceedings of the eigth international solar wind conference: Solar wind eight. AIP Conference Proceedings, Volume 382, pp. 297

Physics

3

Solar Wind Plasma, Sources Of Solar Wind, Particle Measurements

Scientific paper

Using the distribution function f(v) of the solar wind electrons made of two Maxwellians: a core (density nc, temperature Tc) and a halo (density nh, temperature Th), we determine the quasi-thermal noise (QTN) induced by the ambient electrons on the long wire dipole antenna connected to the radio receiver on the Ulysses Unified Radio and Plasma Wave (URAP) Experiment. The QTN spectroscopy yields the total electron density ne, the core temperature Tc, and the core and halo kinetic pressures ncTc and nhTh. We present the results of ne and Tc measured between 1.1 and 3.3 AU in the ecliptic plane, from November 1990 to June 1991. We investigate the variation of Tc with the heliocentric distance. We also study this radial gradient as a function of three classes of ne normalized to 1 AU: Low, intermediate and high densities. The Tc gradient is found to increase with increasing plasma density.

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