External Sq currents in the India-Siberia region
The Sq current systems for quiet days of 1976 and 1977 were studied for observatories established near 76° E. longitude in the northern hemisphere. We used a special spherical harmonic analysis technique to separate the internal and external contributions of the quiet field variations and to determi...
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American Geophysical Union
1993
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ftindianacasci:oai:repository.ias.ac.in:970 2023-05-15T16:19:39+02:00 External Sq currents in the India-Siberia region Campbell, W. H. Arora, Baldev R. Schiffmacher, E. R. 1993 http://repository.ias.ac.in/970/ http://www.agu.org/pubs/crossref/1993/92JA02552.shtml unknown American Geophysical Union Campbell, W. H. Arora, Baldev R. Schiffmacher, E. R. (1993) External Sq currents in the India-Siberia region Journal of Geophysical Research: Space Physics, 98 (A3). pp. 3741-3752. ISSN 0148-0227 Article PeerReviewed 1993 ftindianacasci 2013-01-20T09:27:54Z The Sq current systems for quiet days of 1976 and 1977 were studied for observatories established near 76° E. longitude in the northern hemisphere. We used a special spherical harmonic analysis technique 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 22° to 29°, were found to be at lower geomagnetic latitudes than for Europe and North America. The usual mid-latitude vortex current, reaching 11.0 to 13.2 × 10 4 A in summertime, disappeared completely during winter months in both the years. The Sq current position was affected clearly by the off-spin axis position of the north geomagnetic pole. Throughout the 2 years, we also found small current vorticies near 70° to 80° geomagnetic latitude, which we ascribed to auroral region activity on quiet days. Article in Journal/Newspaper Geomagnetic Pole Siberia Indian Academy of Sciences: Publication of Fellows |
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Open Polar |
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Indian Academy of Sciences: Publication of Fellows |
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ftindianacasci |
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description |
The Sq current systems for quiet days of 1976 and 1977 were studied for observatories established near 76° E. longitude in the northern hemisphere. We used a special spherical harmonic analysis technique 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 22° to 29°, were found to be at lower geomagnetic latitudes than for Europe and North America. The usual mid-latitude vortex current, reaching 11.0 to 13.2 × 10 4 A in summertime, disappeared completely during winter months in both the years. The Sq current position was affected clearly by the off-spin axis position of the north geomagnetic pole. Throughout the 2 years, we also found small current vorticies near 70° to 80° geomagnetic latitude, which we ascribed to auroral region activity on quiet days. |
format |
Article in Journal/Newspaper |
author |
Campbell, W. H. Arora, Baldev R. Schiffmacher, E. R. |
spellingShingle |
Campbell, W. H. Arora, Baldev R. Schiffmacher, E. R. External Sq currents in the India-Siberia region |
author_facet |
Campbell, W. H. Arora, Baldev R. Schiffmacher, E. R. |
author_sort |
Campbell, W. H. |
title |
External Sq currents in the India-Siberia region |
title_short |
External Sq currents in the India-Siberia region |
title_full |
External Sq currents in the India-Siberia region |
title_fullStr |
External Sq currents in the India-Siberia region |
title_full_unstemmed |
External Sq currents in the India-Siberia region |
title_sort |
external sq currents in the india-siberia region |
publisher |
American Geophysical Union |
publishDate |
1993 |
url |
http://repository.ias.ac.in/970/ http://www.agu.org/pubs/crossref/1993/92JA02552.shtml |
genre |
Geomagnetic Pole Siberia |
genre_facet |
Geomagnetic Pole Siberia |
op_relation |
Campbell, W. H. Arora, Baldev R. Schiffmacher, E. R. (1993) External Sq currents in the India-Siberia region Journal of Geophysical Research: Space Physics, 98 (A3). pp. 3741-3752. ISSN 0148-0227 |
_version_ |
1766006060667109376 |