 |
| Titel |
Spectrum of geomagnetic activity in the period range 5-60 days: possible lunar influences |
| VerfasserIn |
J. Střeštik |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 16, no. 7 ; Nr. 16, no. 7, S.804-811 |
| Datensatznummer |
250013340
|
| Publikation (Nr.) |
 copernicus.org/angeo-16-804-1998.pdf |
|
|
|
|
|
| Zusammenfassung |
The series of daily Ap-indices has
been subdivided into pentades (1932–1936 etc.) and spectra with fine-frequency
resolution have been calculated for the indices in each of these intervals.
Daily sunspot numbers have been processed in the same way. The average spectrum
from all spectra in the pentades, as well as the spectrum from the whole
interval have been calculated, and significant peaks have been determined. There
is a significant difference between the spectra in the pentades containing the
solar activity minimum (1932–1936, 1942–1946 etc.) and those containing the
solar activity maximum (1937–1941, 1947–1951 etc.). Most peaks can be
interpreted as a response to solar rotation and to the structure of solar wind
speed (two high-speed streams per solar rotation), both modulated by the
11-year, annual and semi-annual waves. No significant peak corresponding to the
period of the synodic month, or its half has been found. This result suggests
that the influence of lunar cycles on some natural phenomena (if any) is not
mediated by geomagnetic activity.
Key words. Geomagnetism and paleomagnetism · Time
variations · Diurnal to secular · Magnetospheric physics · Solar
wind-magnetosphere interactions |
| |
|
| Teil von |
|
|
|
|
|
|
|
|