Computer Science – Sound
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9611475n&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, July 1, 1991, p. 11,475-11,483.
Computer Science
Sound
3
Beam Injection, Echo Sounding, Field Aligned Currents, Magnetosphere-Ionosphere Coupling, Conjugate Points, Electron Beams, Rocket Flight
Scientific paper
Electron detectors on the Echo 7 active sounding rocket experiment measured 'conjugate echoes' resulting from artificial electron beam injections. Analysis of the drift motion of the electrons after a complete bounce leads to measurements of the magnetospheric convection electric field mapped to ionospheric altitudes. The magnetospheric field was highly variable, changing by tens of mV/m on time scales of as little as hundreds of millisec. While the smallest-scale magnetospheric field irregularities were mapped out by ionospheric conductivity, larger-scale features were enhanced by up to 50 mV/m in the ionosphere. The mismatch between magnetospheric and ionspheric convection fields indicates a violation of the equipotential field line condition. The parallel fields occurred in regions roughly 10 km across and probably supported a total potential drop of 10-100 V.
Nemzek Robert J.
Winckler John R.
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