Theoretical magnetograms based on quantitative simulation of a magnetospheric substorm

Details Theoretical magnetograms based on quantitative simulation of a magnetospheric substorm Theoretical magnetograms based on quantitative simulation of a magnetospheric substorm

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.6137c&link_type=abstract

Journal of Geophysical Research, vol. 87, Aug. 1, 1982, p. 6137-6152.

Other

21

Computerized Simulation, Earth Magnetosphere, Geomagnetism, Ionospheric Currents, Magnetic Signatures, Magnetic Storms, Birkeland Currents, Current Distribution, Electrojets, Midlatitude Atmosphere, Polar Substorms, Ring Currents, Tropical Regions

Scientific paper

Substorm currents derived from the Rice University computer simulation of the September 19, 1976 substorm event are used to compute theoretical magnetograms as a function of universal time for various stations, integrating the Biot-Savart law over a maze of about 2700 wires and bands that carry the ring, Birkeland and horizontal ionospheric currents. A comparison of theoretical results with corresponding observations leads to a claim of general agreement, especially for stations at high and middle magnetic latitudes. Model results suggest that the ground magnetic field perturbations arise from complicated combinations of different kinds of currents, and that magnetic field disturbances due to different but related currents cancel each other out despite the inapplicability of Fukushima's (1973) theorem. It is also found that the dawn-dusk asymmetry in the horizontal magnetic field disturbance component at low latitudes is due to a net downward Birkeland current at noon, a net upward current at midnight, and, generally, antisunward-flowing electrojets.

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