Physics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.4557b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, April 1, 1986, p. 4557-4560.
Physics
9
Convection, Earth Magnetosphere, Interplanetary Magnetic Fields, Magnetohydrodynamic Flow, Electric Fields, Equatorial Atmosphere, Kp Index, Space
Scientific paper
Using 1290 hours of GEO-2 electron gun measurements between 0800 LT and 1900 LT, an analysis was made of the dependence of dayside magnetospheric convection in the equatorial plane at L = 6.6 earth radii on the IMF sector structure. For all IMF sector orientations the plasma flow at noon is directed predominantly sunwared with a slight dawnward component. For positive IMF By the plasma convection around 0900 LT has a duskward component which turns into a dawnward component for negative IMF By values. The ratio between the electric field amplitudes at 1500 LT (dusk sector) and those at 0900 LT (dawn sector) increases from about 2 for IMF LT (dawn sector) increases from about 2 for IMF By positive to 3-4 for negative IMF By components. The convection pattern neither shows dependence on the BX comoponent of the IMF nor is it significantly different for gardenhose and nongardenhose orientations of the IMF. These results support the idea of component merging rather than the antiparallel merging hypothesis.
Baumjohann Wolfgang
Haerendel Gerhard
Nakamura Riou
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