External Sq currents in the India-Siberia region

Details External Sq currents in the India-Siberia region External Sq currents in the India-Siberia region

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3741c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A3, p. 3741-3752.

Physics

12

Geomagnetism, Ionospheric Currents, Magnetic Variations, Solar Terrestrial Interactions, Correlation Coefficients, Spherical Harmonics, Vortices

Scientific paper

The paper examines the Sq current systems for quiet days of 1976 and 1977 for observatories established near 76 deg longitude in the Northern Hemisphere. A spherical harmonic analysis technique is used to separate the internal and external contributions of the quiet field variations and to determine the equivalent external current contours responsible for the Sq field variations on the sixth and twenty-first of each month. The average ratio of the external-to-internal spectral power was 6.7 in 1976 and 7.4 in 1977. Focus positions for the India-Siberia region external Sq current vortex, near 20 to 29 deg, were found to be at lower geomagnetic latitudes than for Europe and North America. The usual midlatitude vortex current, reaching 11.0 to 13.2 x 10 exp 4 A in summertime, disappeared completely during winter months in both years.

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