Cosmic ray variations and turbulent flow systems - 0.3-1.0 AU; 1977-1980

Details Cosmic ray variations and turbulent flow systems - 0.3-1.0 AU; 1977-1980 Cosmic ray variations and turbulent flow systems - 0.3-1.0 AU; 1977-1980

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.2917b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, March 1, 1986, p. 2917-2927.

Physics

8

Cosmic Rays, Solar Wind, Turbulent Flow, Corotation, Forbush Decreases, Helios 1, Modulation, Protons, Shock Waves

Scientific paper

Possible relationships among the cosmic ray intensity and magnetic fields and flows inside 1 AU are investigated using data gathered by instrumentation on the Helios 1 spacecraft during 1977-80. The data included nearly continuous simultaneous plasma and magnetic field measurements for periods of two months or more at heliocentric radii from 0.3-1 AU. Account was taken of fluctuations of the relative particle counting rates due to spacecraft motion. The passage of transient streams following solar wind shock waves was accompanied by Forbush decreases but not long term modulation. The extent and consistency of the data support a model of shell-like disturbances of diverse shapes and internal structures proceeding outward from the sun. Magnetic field fluctuation spectra (turbulence) calculated for the various types of flow observed permitted establishing power laws relationships between the variations observed and the frequency of the magnetic field. Transient flows were more turbulent than corotating flows. Turbulence was also present in mixed flows, possibly arising from shocks, and was usually confined to the spiral shaped structures of corotation.

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