A statistical study of MHD discontinuities in the inner solar system - HELIOS 1 and 2

Details A statistical study of MHD discontinuities in the inner solar system - HELIOS 1 and 2 A statistical study of MHD discontinuities in the inner solar system - HELIOS 1 and 2

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...83..349m&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 83, March 1983, p. 349-365.

Astronomy and Astrophysics

Astronomy

19

Magnetic Field Configurations, Magnetohydrodynamic Flow, Satellite Observation, Solar Magnetic Field, Solar System, Statistical Analysis, Discontinuity, Helios 1, Helios 2, Magnetic Flux, Plasma Diagnostics, Rotating Fluids, Spaceborne Astronomy, Spectroheliographs

Scientific paper

Results are presented of a statistical study of the magnetic field directional discontinuities observed in early 1976 onboard Helios 1 and 2. Strong day-to-day variations of occurrence rates are found on either tangential (TD) or rotational (RD) discontinuities, while no large variation is found versus either heliocentric distance or heliographic latitude. It is found that the orientation of TD and RD normals (identified by a minimum variance technique) are strongly organized by the average magnetic field, following their progressive directional change when approaching the sun. The inclination and azimuthal distributions are gaussian and strongly peaked along the field lines for the RDs. The normals of the TDs are perpendicular to the average field and follow its progressive variation, while the inclination distribution is isotropic in solid angle, which is interpreted as evidence of the crossing of flux tubes on the order of one/hour. Also examined are the implications of this interpretation in contrast with a turbulent approach.

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