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

Campbell, W. H.

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

Genre:

Article

ProdID:

70011302

Citation Author:

Campbell, W. H.

Citation Contributing Office:

Citation Datum:

Citation Day:

Citation Edition:

Citation Editor:

Citation End Page:

Citation Issue:

Citation Keywords:

Citation Language:

English

Citation Larger Work Title:

Geophysical Journal of the Royal Astronomical Society

Citation LatN:

Citation LatS:

Citation LonE:

Citation LonW:

Citation Month:

Citation No Pagination:

Citation Number Of Pages:

Citation Online Only Flag:

Citation Phsyical Description:

Citation Projection:

Citation Public Comments:

Citation Publisher:

Wiley

Citation Series:

Citation Series Code:

Citation Series Number:

Citation Search Results Text:

A description of the external and internal quiet daily variation currents at North American locations for a quiet-Sun year.; 1983; Article; Journal; Geophysical Journal of the Royal Astronomical Society; Campbell, W. H.