Physics
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9813779s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A8, p. 13,779-13,786.
Physics
8
Geomagnetism, Ionospheric Conductivity, Ionospheric Currents, Magnetic Flux, Periodic Variations, Ionospheric Electron Density, Mathematical Models, Sunrise
Scientific paper
A flux gate magnetometer with an amplitude resolution of 6 pT/LSB was installed at Huancayo, Peru in December 1985 and recorded field variations for 1 year with 3-s sampling intervals. Horizontal field variations of Pc 3-4 pulsations were studied and it was found that the oscillations were observed predominantly in the H component, though oscillations in the D component are superimposed temporarily at local sunrise. The D component signals, which last for roughly 2 hrs 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, while it lies in the NE-SW quadrant for local winter. 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.
Alperovich L.
Saka O.
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