Morphology of magnetic merging at the magnetopause

Details Morphology of magnetic merging at the magnetopause Morphology of magnetic merging at the magnetopause

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jatp...52.1123c&link_type=abstract

(A91-27441 10-46) Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 52, Dec. 1990, p. 1123-1134. USAF-suppor

Physics

7

Flux Transfer Events, Magnetic Field Configurations, Magnetohydrodynamics, Magnetopause, Boundary Conditions, Interplanetary Magnetic Fields, Morphology, Topology

Scientific paper

To illustrate the basic features of magnetospheric topology, the development of a global model is traced from the superposition of dipole and uniform fields to the effects of adding, in turn, diffusion regions, surface currents, and a magnetic field component normal to the magnetopause. The subsolar, antiparallel, tearing, and patchy merging geometries proposed in the past all emerge under various conditions, but models that deduce merging geometry from global boundary conditions are lacking. An exception is a model in which the external field merges wherever it falls tangent to the magnetopause. The result is a subsolar merging line that has all the characteristics of early sketches based on local arguments. Magnetosheath plasma beta affects magnetospheric topology and, consequently, merging geometry. Low, high, and variable beta favor subsolar, tearing, and patchy merging, respectively. Proposed flux-transfer-event models of bursty reconnection from a single merging line, flux ropes from multiple merging lines, and flux tube elbows from patches can also be categorized by plasma beta in the same respective order.

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