Comparison of the Width and Intensity of the Suprathermal Electron Strahl in General Solar Wind and ICME Solar Wind.

Details Comparison of the Width and Intensity of the Suprathermal Electron Strahl in General Solar Wind and ICME Solar Wind. Comparison of the Width and Intensity of the Suprathermal Electron Strahl in General Solar Wind and ICME Solar Wind.

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh21a1580a&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SH21A-1580

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2101 Coronal Mass Ejections (7513), 2114 Energetic Particles (7514), 2134 Interplanetary Magnetic Fields, 2164 Solar Wind Plasma

Scientific paper

In this study we examine the width and intensity of the solar wind suprathermal electron strahl. We report on the variability of these features across various types of solar wind flow using 70 eV-1370 eV electron data from ACE/SWEPAM. In preliminary work we have characterized general solar wind using the first 108 days of 2000 and determined strahl widths and intensities by fitting a function that consists of a Gaussian plus a constant term to the measured pitch angle distributions. Approximately 78% of the distributions are well- described by this function. We then used data from ICME intervals with clear counterstreaming suprathermal electrons and similarly determined the strahl width and intensity. Results show that the strahl is typically comprised of two populations: one of narrow width, HWHM~10°, and the other broader, HWHM~25°. Narrow suprathermal electron strahls are fractionally more likely to occur in ICME solar wind. Approximately 30% of general solar wind strahls have widths less than 20°, compared with approximately 55% of ICME strahls. Further, in ICME counterstreaming solar wind at a given time, the narrower strahl nearly always has a width less than 20° whereas the broader strahl is nearly always wider than 20°, indicating that counterstreaming suprathermal electron strahls typically have different widths.

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