Proton temperature properties in the solar wind

Details Proton temperature properties in the solar wind Proton temperature properties in the solar wind

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35..185m&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 35, Feb. 1987, p. 185-189.

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2

Proton Energy, Solar Protons, Solar Wind, Flow Velocity, Heat Generation, Interplanetary Spacecraft, Japanese Spacecraft, Temperature Measurement

Scientific paper

Proton temperature in the solar wind between 0.68 and 0.98 a.u. is investigated from the point of view of heat generation in the interplanetary space based on the solar wind data from the Japanese interplanetary spacecraft Suisei. The heliocentric radial gradient of proton temperature tends to decrease in high-speed regions owing to heat generation accompanied by a velocity increase of more than 50 km s-1 per hour. Temperature measurements in the region with decreasing or nearly constant flow velocity reveal cooling of the form R-0.9≡-1.2, still slower than the adiabatic case. The remnant difference suggests the existence of another heating mechanism for protons, especially in a low-speed stream.

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