Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..81..103g&link_type=abstract
Astrophysics and Space Science, vol. 81, no. 1-2, Jan. 1982, p. 103-122.
Astronomy and Astrophysics
Astrophysics
9
Explorer 50 Satellite, Helios 1, Interplanetary Magnetic Fields, Solar Wind Velocity, Space Plasmas, Temperature Distribution, Astronomical Models, Magnetic Field Configurations, Protons, Shock Waves, Temperature Gradients
Scientific paper
An analysis of interplanetary plasma and magnetic field data from Helios-1 (for December 1974-December 1976), Helios-2 (for January-December 1976) and IMP-8 (for December 1974-December 1976) has led to the identification of some 85 cases of very low proton temperature. In 50 of these cases, characteristic variations favorable for closed structures in the solar wind were found in the interplanetary magnetic field. Cold protons, at 0.3 AU from the sun, were identified by using the calculated radial temperature gradients as a function of (1) the solar wind speed and (2) the heliocentric distance. The estimation of the 10 solar radii-distance at which regions of cold protons are formed shows that this distance is the same whether the solar wind plasma data used was measured in fixed or in varied heliocentric distances.
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