Where do solar wind-controlled micropulsations originate

Details Where do solar wind-controlled micropulsations originate Where do solar wind-controlled micropulsations originate

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980p%26ss...28..535g&link_type=abstract

Planetary and Space Science, vol. 28, May 1980, p. 535-543.

Computer Science

1

Geomagnetic Micropulsations, Magnetohydrodynamic Flow, Satellite Observation, Solar Terrestrial Interactions, Solar Wind Velocity, Flow Geometry, Heos A Satellite, Interplanetary Magnetic Fields, Kelvin-Helmholtz Instability, Magnetopause, Magnetosheath

Scientific paper

An analysis of micropulsation data, recorded at Borok during upstream wave events observed by the HEAOS satellite in the solar wind, clearly demonstrates that pulsation activity was present at Borok only when the solar wind velocity was sufficiently large compared with the sunward component of the Alfven velocity along the interplanetary magnetic field. It is shown that the form of this relationship is consistent with the generation of the Borok pulsations by the Kelvin-Helmholtz mechanism at the magnetopause. The experimentally determined threshold for this wave excitation agrees best with theory when the latter represents a magnetosheath flow of finite thickness and nonlinear effects of the interaction are included. The modified theoretical treatment is given in the appendix.

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