Dependence of the proton beam drift velocity on the proton core plasma beta in the solar wind

Details Dependence of the proton beam drift velocity on the proton core plasma beta in the solar wind Dependence of the proton beam drift velocity on the proton core plasma beta in the solar wind

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10905101t&link_type=abstract

Journal of Geophysical Research, Volume 109, Issue A5, CiteID A05101

Physics

Plasma Physics

19

Interplanetary Physics: Solar Wind Plasma, Space Plasma Physics: Wave/Particle Interactions, Space Plasma Physics: Waves And Instabilities, Space Plasma Physics: Transport Processes

Scientific paper

A correlation between the proton core plasma beta and the proton beam drift speed in units of the local Alfvén speed has been found in high-speed solar wind with the Helios 2 spacecraft plasma data obtained in 1976. This relation reads vd/vA = (2.16 +/- 0.03) β$\parallel$c(0.281+/-0.008) for the range β$\parallel$c = 0.1 to 0.6, where β$\parallel$c is the proton core plasma beta determined from the proton core thermal velocity component parallel to the magnetic field, vd is the proton beam drift speed relative to the core, and vA is the local Alfvén speed. This relation places a tight constraint on theoretical models which describe the formation of the proton beam in the fast solar wind. It is also found that most of the observed proton beam distributions are stable with respect to the electromagnetic proton instability.

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