Abstract
A flux gate magnetometer with an amplitude resolution of 6 pT/LSB was installed at Huancayo, Peru (12°S, 750°W in geographic coordinates, 0.8°N, 335.6° in geomagnetic coordinates) in December 1985 and recorded field variations for 1 year with 3‐s sampling intervals. Horizontal field variations of Pc 3‐4 pulsations (periods from 150 to 30 s) were studied and it was found that the oscillations were observed predominantly in the H component (magnetic north‐south), though oscillations in the D component (magnetic east‐west) are superimposed temporarily at local sunrise. The D component signals, which last for ≈2 hours after local sunrise, bring about a large tilt of the polarization azimuth angles in the H‐D plane without a significant change in the ellipticity. The azimuth at sunrise lies in the NW‐SE quadrant during local summer (November to January), while it lies in the NE‐SW quadrant for local winter (March to September). On the basis of the observed seasonal change of the azimuth angles, we present a model of the ionospheric current system setup by the incident Pc 3‐4 pulsations in the dayside region of the dawn terminator at the dip‐equator.
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