Polar cap geomagnetic field responses to solar sector changes

Physics

Scientific paper

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Diurnal Variations, Geomagnetism, Magnetic Effects, Magnetic Signatures, Magnetic Variations, Polar Caps, Solar Magnetic Field, Interplanetary Magnetic Fields, Ionospheric Currents, Magnetic Flux, Magnetopause

Scientific paper

A computer analysis of digitized magnetograms from Alert, Thule, Resolute Bay, Mould Bay and Godhavn for 1965 and from Thule and Vostok for 1967 was performed to determine the characteristic features of the day-to-day geomagnetic field variations related to interplanetary solar sector field direction. A sector-related phase shift in the characteristic diurnal variation was found to occur principally for the dayside vertical geomagnetic component. The quiet nighttime level of the field Z component rose and fell on days when the IMF was directed toward or away from the sun, respectively. In 1967, the standoff locations of the magnetopause and magnetoshock boundaries were about 1 R-sub E more distant from the earth for the average toward sector days than for the away sector days.

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