Thermal iron ions in high speed solar wind streams Detection by the IMP 7/8 energetic particle experiments

Details Thermal iron ions in high speed solar wind streams Detection by the IMP 7/8 energetic particle experiments Thermal iron ions in high speed solar wind streams Detection by the IMP 7/8 energetic particle experiments

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7..661m&link_type=abstract

Geophysical Research Letters, vol. 7, Sept. 1980, p. 661-664.

Physics

2

Abundance, Energetic Particles, Heavy Ions, Iron, Solar Corpuscular Radiation, Solar Wind Velocity, Thermal Plasmas, Explorer 47 Satellite, Explorer 50 Satellite, Ion Temperature, Radiation Detectors

Scientific paper

The first measurements of the abundance of iron ions in high speed (greater than 600 km/s) solar wind streams have been made with the NOAA/JHU energetic particles experiments (EPE) on IMP 7/8. The identification of iron ions is quantitatively established using 4 years of observations and heavy ion accelerator calibrations of detectors similar to those flown on the spacecraft. Preliminary estimates of the Fe/H ratio are within a factor of 2 of the adopted coronal abundance (0.00005), and there is some evidence that Fe/H may remain approximately constant within a given stream. In the peaks of fast streams (700-800 km/s), about 50 iron ion counts are obtained every 20 s, offering the possibility of studying the Fe/H ratio with approximately 1 m time resolution in high speed streams throughout the decline of Solar Cycle 20 and the rise of Solar Cycle 21.

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