Radial Evolution of Non-thermal Electrons in the Low-latitude Solar Wind: Helios, Cluster and Ulysses Observations

Details Radial Evolution of Non-thermal Electrons in the Low-latitude Solar Wind: Helios, Cluster and Ulysses Observations Radial Evolution of Non-thermal Electrons in the Low-latitude Solar Wind: Helios, Cluster and Ulysses Observations

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh21a1581s&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SH21A-1581

Physics

Plasma Physics

2164 Solar Wind Plasma, 7800 Space Plasma Physics, 7859 Transport Processes

Scientific paper

We have performed a statistical study of a substantial amount of solar wind electron velocity distribution functions (eVDFs). In our data set we combine measurements acquired on-board three spacecraft (HELIOS, CLUSTER II and ULYSSES) in the low ecliptic latitudes covering the heliocentric distance from 0.3 up to 4 AU. In this study we focus on the non-thermal properties of the measured eVDFs in both the slow and the fast solar wind regimes. All three eVDF components typically observed in the solar wind, i.e. the core, the halo and the strahl, are modeled analytically. We mainly study the fractional densities of the three electron components and also the non-Maxwellian character of the high energy eVDF tails as a function of the radial distance from the Sun. Furthermore, we provide some preliminary results concerning the higher eVDF moments, i.e. the temperature of the eVDF components and their contribution to the overall electron heat flux. In addition, we summarize all mean electron properties in the radial evolution of the model eVDF.

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