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Incoherent scatter measurements of E region conductivities and currents in the auroral zoneData taken by incoherent scatter radar have been used to investigate ionospheric conductivities and electrical currents. During quiet days, the conductivities appear to vary in a way consistent with ionization arising from solar EUV radiation. In the evening hours, enhancements in the northward electric field are found to precede small increases in the conductivities. Strong enhancements of the Hall conductivity relative to the Pedersen conductivity occur during negative bays when the electric field is in a southwestward direction. The ionospheric currents calculated in the geomagnetic east-west direction are in good agreement with the H component measured by a nearby magnetometer; this result indicates that the current causing the ground level magnetic fluctuations is a broad horizontal sheet current. The north-south ionospheric current, however, consistently disagrees with the observed D component in a manner that cannot easily be explained unless currents parallel to the earth's magnetic field are present.
Document ID
19740060931
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Brekke, A.
Doupnik, J. R.
Banks, P. M.
(California, University La Jolla, Calif., United States)
Date Acquired
August 7, 2013
Publication Date
September 1, 1974
Publication Information
Publication: Journal of Geophysical Research
Volume: 79
Subject Category
Geophysics
Accession Number
74A43681
Funding Number(s)
CONTRACT_GRANT: NGR-05-009-180
CONTRACT_GRANT: NSF GS-36281
CONTRACT_GRANT: NSF GA-36095
CONTRACT_GRANT: NGR-05-009-075
CONTRACT_GRANT: DNA001-72-0076
Distribution Limits
Public
Copyright
Other

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