Source Effect on Geomagnetic Induction Vectors in the Fennoscandian Auroral Region.

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  • Viljanen Ari
    Finnish Meteorological Institute, Department of Geophysics

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  • Source Effect on Geomagnetic Induction

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Geomagnetic induction vectors were calculated at the IMAGE magnetometer stations in Fennoscandia using hundreds of four-hour events of quiet time variations, and of magnetic storms due to eastward and westward electrojets. Quiet time vectors were found to be very similar to those calculated previously using a set of carefully selected plane wave events. Due to the source effect during electrojet events, the average direction of the induction vectors may rotate tens of degrees compared to the quiet time. The length generally increases tens of percent, but at the stations MAS and SOR near the electrojet and highly-conducting anomalies, a decrease is observed. If the quiet time induction vector is longer than about 0.50 then the source effect does not affect the direction of the vector remarkably even if the length may change considerably. If the conductivity anomaly is weaker (quiet time vector shorter than about 0.30) then the source effect dominates near the electrojet (PEL, MUO, KEV, KIL), but is less important farther away (NUR, OUJ). If a large number of magnetically quiet events are available of local morning hours, no special reduction of the source effect is needed in the research area.

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