Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..81..333g&link_type=abstract
Astrophysics and Space Science, vol. 81, no. 1-2, Jan. 1982, p. 333-343.
Astronomy and Astrophysics
Astrophysics
3
Helios 1, Solar Activity Effects, Solar Wind Velocity, Velocity Distribution, Coronal Holes, Data Reduction, Shock Fronts, Statistical Analysis, Temperature Dependence
Scientific paper
The first three-year flight (1974-1977) of Helios-1, consisting of six elliptic orbits around the sun (perihelion equals 0.309 AU), is examined and used to deduce the characteristic spatial and temporal properties of the solar wind plasma. Results show that the slow solar wind first increases its speed with heliocentric distance, becoming constant at about 370 km/sec. The means speeds in the range 0.3 to 1.0 AU is 350 km/sec for the slow solar plasma, and 650-700 km/sec for the fast solar plasma. There is also an intermediate solar wind at 450 km/sec near the earth. At times of enhanced solar activity, only the slow solar wind is present, while all three are found at periods of solar minimum. Results also show that the dependence of the proton temperature on speed is the same for different solar activity epochs; the dependence is stronger, however, during compression at the leading edge than during expansion at the trailing edge of a solar wind stream.
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