In-situ observations of the latitudinal gradients of the solar wind parameters during 1976 and 1977

Details In-situ observations of the latitudinal gradients of the solar wind parameters during 1976 and 1977 In-situ observations of the latitudinal gradients of the solar wind parameters during 1976 and 1977

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986soph..104..431b&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 104, April 1986, p. 431-445.

Physics

45

Interplanetary Magnetic Fields, Solar Wind, Coronal Loops, Current Sheets, Explorer 50 Satellite, Flux Density, Helios 1, Helios 2, Solar Protons

Scientific paper

Interplanetary observations from Helios 1, Helios 2, and IMP-8 spacecraft during 1976 and 1977, namely the early portion of solar cycle 21, have been used to investigate the latitudinal gradients of the solar-wind parameters with respect to the angular displacement from the current sheet inferred from synoptic HAO white-light maps of the solar corona at 1.75 solar radii. A latitudinal belt of + or - 25 deg around the current sheet has been investigated. Large gradients for solar-wind flow speed, proton density, and temperature have been found. Smoother gradients were also found for particle flux, kinetic, gravitational, and thermal energy density flux. All these gradients become smoother toward the solar-cycle maximum. Neither latitudinal nor temporal variations were identified for magnetic and thermal energy density. A remarkable result of this study is that the momentum flux density and the total energy flux density, which other authors found to be independent of any longitudinal stream structure, were also found to be independent of any latitudinal structure. Moreover, these two parameters did not show any temporal variation during the period of interest.

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