Observations of solar wind stream with high abundance of heavy ions and relation with coronal conditions

Details Observations of solar wind stream with high abundance of heavy ions and relation with coronal conditions Observations of solar wind stream with high abundance of heavy ions and relation with coronal conditions

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981p%26ss...29.1235z&link_type=abstract

Planetary and Space Science, vol. 29, Nov. 1981, p. 1235-1240.

Computer Science

9

Abundance, Heavy Ions, Plasma Spectra, Prognoz Satellites, Solar Corona, Solar Wind, Alpha Particles, Energy Spectra, Oxygen Ions, Protons, Solar Temperature

Scientific paper

Long intervals, during which heavy ions were detected in the high energy tail of the energy spectra of solar wind ions, were recorded by the plasma spectrometer SCS onboard the Prognoz-7 satellite. In particular, such a region with unusual features - low velocity, high density, low temperature of protons and, especially, low temperature of alpha-particles - was observed during 10-13 December 1978. The time dependence of these parameters makes it possible to recognize this event as 'noncompressive density enhancement'. In this region heavy ions such as O(6+), O(7+), Si(7+), Si(8+), Si(9+) and a group of iron from Fe(6+) to Fe(13+) were identified by the electrostatic analyzer. The abundance of these ions relative to protons was about ten times higher than had previously been observed. The coronal temperature, estimated from the ratios of the ion fluxes with different ionization states, is higher than that estimated earlier for the oxygen ions.

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