Properties of a large-scale interplanetary loop structure as deduced from low-energy proton anisotropy and magnetic field measurements

Details Properties of a large-scale interplanetary loop structure as deduced from low-energy proton anisotropy and magnetic field measurements Properties of a large-scale interplanetary loop structure as deduced from low-energy proton anisotropy and magnetic field measurements

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92....6t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Jan. 1, 1987, p. 6-14.

Physics

29

Interplanetary Magnetic Fields, Magnetic Field Configurations, Magnetic Measurement, Proton Energy, Shock Wave Propagation, International Sun Earth Explorer 3

Scientific paper

Correlated particle and magnetic field measurements by the ISEE 3 spacecraft are presented for the loop structure behind the interplanetary traveling shock event of Nov. 12, 1978. Following the passage of the turbulent shock region, strong bidirectional streaming of low-energy protons is observed for approximately 6 hours, corresponding to a loop thickness of about 0.07 AU. This region is also characterized by a low relative variance of the magnetic field, a depressed proton intensity, and a reduction in the magnetic power spectral density. Using quasi-linear theory applied to a slab model, a value of 3 AU is derived for the mean free path during the passage of the closed loop. It is inferred from this observation that the proton regime associated with the loop structure is experiencing scatter-free transport and that either the length of the loop is approximately 3 AU between the sun and the earth or else the protons are being reflected at both ends of a smaller loop.

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