Long-term variations of the solar wind proton parameters

Details Long-term variations of the solar wind proton parameters Long-term variations of the solar wind proton parameters

Dec 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974jgr....79.5095d&link_type=abstract

Journal of Geophysical Research, vol. 79, Dec. 1, 1974, p. 5095-5108. Research supported by the Consiglio Nazionale delle Ricer

Physics

15

Interplanetary Medium, Proton Flux Density, Solar Protons, Solar Wind Velocity, Annual Variations, Explorer Satellites, Heos Satellites, Interplanetary Magnetic Fields, Plasma Density, Satellite Observation, Solar Cycles, Solar Wind, Vela Satellites

Scientific paper

Interplanetary plasma data taken near 1 AU by a variety of spacecraft (Imp 1, Vela 2-4, Explorer 33-35, and Heos 1) from 1963 to 1971 are used to study the long-term variations of the solar wind proton properties. An intercalibration among the different experiments is performed in order to obtain a coherent set of data. The most interesting result is a 40% reduction of the proton density between the minimum and the maximum of the solar activity cycle. The observed density variation occurs throughout the velocity range; however, a limited sample of data could suggest that at very low velocities (below 300 km/sec) the density is independent of the solar activity. The proton bulk velocity is remarkably constant during the period considered; small increases of the average speed occurring in 1968 and 1971 cannot be attributed to the solar cycle. No clear trend is exhibited by the proton temperature; differences among the various experiments probably have an instrumental origin.

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