On the temperature of alpha-particles and heavy ions in the solar wind

Details On the temperature of alpha-particles and heavy ions in the solar wind On the temperature of alpha-particles and heavy ions in the solar wind

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ncimc...7..604e&link_type=abstract

(Convegno Nazionale di Fisica Cosmica, 2nd, L'Aquila, Italy, May 29-June 1, 1984) Nuovo Cimento C, Serie 1 (ISSN 0390-5551), vol

Physics

Alpha Particles, Energy Spectra, Heavy Ions, Ion Temperature, Solar Wind Velocity, International Sun Earth Explorer 2, Proton Energy

Scientific paper

The temperature of protons, α particles, silicon and iron ions in the solar wind have been determined analysing 140 energy spectra measured aboard the ISEE-2 spacecraft during 1978 and 1979. The data cover the range of proton temperatures Tp from 104K to 105K. The experimental results show that in this range of temperatures and for solar-wind velocities vsw smaller than 370 km s-1, the temperature of the α-particles Tα is smaller than Tp. Tα actually increases faster than Tp with vsw; however, for vsw ≤ 420 km s-1 the ratio Tα/Tp is always less than 4, while previous observations at higher temperatures (105K to 106K) are consistent with a constant ratio Tα/Tp = 4. The temperature of the silicon ions, moreover, tends to become independent of Tp for proton temperatures greater than 3×104K.

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