Origin of low cross-helicity regions in the inner solar wind

Details Origin of low cross-helicity regions in the inner solar wind Origin of low cross-helicity regions in the inner solar wind

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.7841b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, May 1, 1991, p. 7841-7851. CNR-supported research.

Physics

41

Helices, Magnetohydrodynamic Turbulence, Magnetohydrodynamic Waves, Solar Wind, Space Plasmas, Statistical Analysis, Wave Propagation

Scientific paper

Results are presented from a statistical analysis of the interplanetary data set obtained from the primary mission of Helios 2 (i.e., data from the first 4 months), with special attention given to the origin of low cross-helicity regions in the inner solar wind. Results showed that: (1) the local generation of Alfven modes is not common in the solar wind, (2) the radial evolution of normalized cross-helicity is mainly due to the continuous destruction of the outward modes rather than to the presence of inward modes, and (3) inward modes are likely to be representative of plasma structures convected by the solar wind rather than of propagating Alfvenic fluctuations.

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