Magnetic field directional discontinuities. 2: Characteristics between 0.46 and 1.0 AU

Details Magnetic field directional discontinuities. 2: Characteristics between 0.46 and 1.0 AU Magnetic field directional discontinuities. 2: Characteristics between 0.46 and 1.0 AU

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980stin...8112963l&link_type=abstract

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Interplanetary Magnetic Fields, Magnetic Anomalies, Magnetic Field Configurations, Nonuniform Magnetic Fields, Data Sampling, Magnetohydrodynamic Waves, Mariner 10 Space Probe, Plasma Interactions, Solar Wind, Space Plasmas, Statistical Analysis

Scientific paper

The characteristics of directional discontinuities (DD's) in the interplanetary magnetic field are studied using data from the Mariner 10 primary mission between 1.0 and 0.46 AU. Statistical and visual survey methods for DD identification resulted in a total of 644 events. Two methods were used to estimate the ratio of the number of tangential discontinuities (TD's) to the number of rotational discontinuities (RD's). Both methods show that the ratio of TD's to RD's varied with time and decreased with decreasing radial distance. A decrease in average discontinuity thickness of approx. 40 percent was found between 1.0 and 0.72 AU and approx. 54 percent between 1.0 and 0.46 AU, independent of type (TD or RD). This decrease in thickness for decreasing r is in qualitative agreement with Pioneer 10 observations between 1 and 5 AU. When the individual DD thickness are normalized with respect to the estimated local proton gyroradius (RAL), the average thickness at the three locations is nearly constant, 43 + or - 6 RL. This also holds true for both RD's and TD's separately. Statistical distributions of other properties, such as normal components and discontinuity plane angles, are presented.

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