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Author Fairfield, D. H.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ AURORAE ♦ CURRENTS ♦ DIAGRAMS ♦ DISTURBANCES ♦ EARTH ♦ IONOSPHERE ♦ MAGNETIC FIELDS ♦ SUN ♦ VARIATIONS ♦ VECTORS ♦ ZONES
Abstract Magnetograms from 25 high-northern-latitude geomagnetic observatories were used to study the current systems producing magnetic disturbances. Equivalent overhead current vectors representing directions and relative intensities of currents over the various stations were computed from the observed perturbations in the horizontal magnetic field components and plotted on polar maps, from which average current systems for specific hourly periods were studied. Successive hours on 28 quiet and moderately disturbed days of the IGY were investigated. The basic patterns of current flow revealed by these maps are the S/sub q/ and DS systems. Vectors corresponding to S/sub q/ currents are often below the auroral zone; higher-latitude stations afford evidence for currents flowing in the DS pattern, even on the most quiet days. Current vectors at the three highestlatitude stations are generally parallel and pointing west of the sun direction in accord with the usual DS pattern. Changes in this polar-cap current direction as indicated by these stations suggest a change in orientation of the DS pattern with respect to the sun direction that is occasionally quite large and rapid. (auth)
ISSN 00221406
Educational Use Research
Learning Resource Type Article
Publisher Date 1963-06-15
Publisher Department Pennsylvania State Univ., University Park
Journal Journal of Geophysical Research
Volume Number 68
Organization Pennsylvania State Univ., University Park


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