A new method of mapping worldwide potential contours for ground magnetic perturbations - Equivalent ionospheric current representation

Details A new method of mapping worldwide potential contours for ground magnetic perturbations - Equivalent ionospheric current representation A new method of mapping worldwide potential contours for ground magnetic perturbations - Equivalent ionospheric current representation

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.3810k&link_type=abstract

Journal of Geophysical Research, vol. 81, Aug. 1, 1976, p. 3810-3820.

Computer Science

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3

Computer Graphics, Ionospheric Currents, Magnetic Disturbances, Perturbation Theory, Potential Theory, Synoptic Measurement, Auroral Zones, Computer Techniques, Contours, Geomagnetic Pulsations, Geomagnetism, Mapping, Poisson Equation, Polar Substorms

Scientific paper

A method is proposed for computer mapping of the worldwide potential contours for ground magnetic perturbations. The method includes digitization of the magnetic perturbation values by taking a suitable base level at each observatory, transformation from these coordinates into a common geomagnetic system, interpolation of the field values to provide values at a regular network of points, and computation of the magnetic potential at each grid point to determine the associated current system in the ionosphere. A series of the isopotential contours is also shown in order to examine how the potential pattern changes during polar magnetic substorms. A recurrent feature of the polar magnetic substorm is that a significant part (about one third) of the equivalent current flow originating in the westward auroral jet flows in the evening sector at middle and low latitudes.

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