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Electric field measurements across the harang discontinuityThe Harang discontinuity, the area separating the positive and negative bay regions in the midnight sector of the auroral zone, is a focal point for changes in behavior of many phenomena. Through this region the electric field rotates through the west from a basically northward field in the positive bay region to a basically southward field in the negative bay region, appearing as a reversal in a single axis measurement; 32 of these reversals have been identified in the OGO-6 data from November and December, 1969. The discontinuity is dynamic in nature, moving southward and steepening its latitudinal profile as magnetic activity is increased. As activity decreases it relaxes poleward and spreads out in latitudinal width. It occurs over several hours of magnetic local time. The boundary in the electric field data is consistent with the reversal of ground magnetic disturbances from a positive to negative bay condition. The discontinuity is present in the electric field data both during substorms and during quiet times and appears to define a pattern on which other effects can occur.
Document ID
19740010910
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Maynard, N. C. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 3, 2013
Publication Date
February 1, 1974
Subject Category
Geophysics
Report/Patent Number
NASA-TM-X-70613
X-625-74-67
NSSDC-ID-69-051A-23-PM
Accession Number
74N19023
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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