Geomagnetic activity and the beta dependence of the dayside reconnection rate

Details Geomagnetic activity and the beta dependence of the dayside reconnection rate Geomagnetic activity and the beta dependence of the dayside reconnection rate

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9914811s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A8, p. 14,811-14,814

Physics

21

Beta Particles, Geomagnetism, Magnetic Field Reconnection, Solar Planetary Interactions, Solar Wind, Energy Transfer, Mach Number, Magnetopause, Mathematical Models, Rankine-Hugoniot Relation

Scientific paper

In previous work we have used geomagnetic activity as a proxy measure of the reconnection rate to determine how the upstream solar wind parameters control reconnection. We extend that work to show how the solar wind magnetosonic Mach number, upstream solar wind beta, and the cone angle of the interplanetary magnetic field are correlated with a proxy measure of the efficiency of the reconnection process. Each of these three parameters controls the plasma beta in the magnetosheath downstream of the Earth's bow shock. The dependence of the efficiency of reconnection on the above parameters is in agreement with the expectation that large magnetosheath betas reduce the rate of or hinder the onset of dayside reconnection.

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