Secular, annual, and semiannual changes in the baseline level of the earth's magnetic field at North American locations
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Abstract
Secular, annual, and semiannual changes were obtained from the midnight values of field on specially determined days of quiet magnetospheric conditions. From a selection of North American observatories the latitude variation of these changes was evaluated from 20° to 65°. Results for the active and quiet sun years (1958 and 1965) were compared, and changes at Tucson were traced from 1958 through 1974. The year-to-year variance in the determination of a secular change seemed to be decreased by the present analysis method in comparison to a method which uses the annual mean of hourly values. The annual horizontal field variations were largely northward in early summer and southward in early winter; quiet year amplitudes of 2 to 3 γ about doubled in the solar active year. The amplitudes of the semiannual field vectors were about one half that of the annual vectors; the directions were apparently inconsistent from year to year.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Secular, annual, and semiannual changes in the baseline level of the earth's magnetic field at North American locations |
| Series title | Journal of Geophysical Research Solid Earth |
| DOI | 10.1029/JB085iB11p06557 |
| Volume | 85 |
| Issue | B11 |
| Year Published | 1980 |
| Language | English |
| Publisher | American Geophysical Union |
| Description | 15 p. |
| First page | 6557 |
| Last page | 6571 |
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