Solar wind Fe and CNO measurements in high-speed flows

Details Solar wind Fe and CNO measurements in high-speed flows Solar wind Fe and CNO measurements in high-speed flows

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.4133i&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, April 1, 1986, p. 4133-4141. DOE-sponsored research.

Physics

44

Abundance, Coronal Holes, Ion Charge, Solar Temperature, Solar Wind, Carbon, Hydrogen, International Sun Earth Explorer 3, Ionization, Iron, Nitrogen, Oxygen, Solar Flares, Solar Wind Velocity

Scientific paper

The authors present solar wind Fe charge state and density measurements from two time periods of high-speed solar wind occurring during a flare-associated driver plasma and two time periods during coronal hole-associated high-speed streams. The observations, made with the ultralow energy charge analyzer (ULECA) sensor on ISEE 3, indicate that the iron in the driver plasma solar wind was predominately of charge state 15 or 16, indicative of an unusually high coronal temperature (≡4x106K). The authors also present the charge state distribution of the CNO group in one coronal hole-associated stream and find an ionization temperature of (1.3±0.3)x106K. Combining the ULECA measurements with proton observations made with the Los Alamos National Laboratory solar wind instrument on ISEE 3, they find that the speed of solar wind iron is equal to that of hydrogen in the driver plasma but is substantially higher in the coronal hole flows. The abundance ratio Fe/H, relative to the nominal interstream value, is found to be enhanced by a factor of ≡2 in the driver plasma and depressed by a factor of ≡2 in the coronal hole-associated solar wind.

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