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Parallel electric fields detected via conjugate electron echoes during the Echo 7 sounding rocket flightElectron 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.
Document ID
19910060893
Document Type
Reprint (Version printed in journal)
Authors
Nemzek, R. J. (Minnesota Univ. Minneapolis, MN, United States)
Winckler, J. R. (Minnesota, University Minneapolis, United States)
Date Acquired
August 14, 2013
Publication Date
July 1, 1991
Publication Information
Publication: Journal of Geophysical Research
Volume: 96
ISSN: 0148-0227
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: NSG-5088
CONTRACT_GRANT: NGT-50009
Distribution Limits
Public
Copyright
Other