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A description of the external and internal quiet daily variation currents at North American locations for a quiet-Sun year.

Geophysical Journal of the Royal Astronomical Society

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DOI: 10.1111/j.1365-246X.1983.tb03806.x

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Abstract

An order 4, degree 12 spherical harmonic analysis of the smoothed quiet geomagnetic daily variations was used to separate the external and internal geomagnetic Sq field at North American locations for the quiet-Sun year, 1965. These fields were represented by a month-by-month display of equivalent current vortex systems with dominant, pre-noon foci. The focus reached 40o latitude near the June solstice and about 30o latitude near the December solstice. The daily range of Sq current amplitudes was largest in late July to early August and smallest in mid-December. Semi-annual variations of Sq currents dominated only the equatorial region. Daily maxima in mid-latitudes, occurred mostly near local noon in December to February and about 1 hr before noon in June to mid-October. -Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
A description of the external and internal quiet daily variation currents at North American locations for a quiet-Sun year.
Series title:
Geophysical Journal of the Royal Astronomical Society
DOI:
10.1111/j.1365-246X.1983.tb03806.x
Volume
73
Issue:
1
Year Published:
1983
Language:
English
Publisher:
Wiley
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Journal of the Royal Astronomical Society
First page:
51
Last page:
64