Note on the Fifteen-Month Period in Solar Activity, Terrestrial Magnetism, and Radio Reception

Note on the Fifteen-Month Period in Solar Activity, Terrestrial Magnetism, and Radio Reception

A marked 15-month period has been found in sun spots, terrestrial magnetism, and radio reception. Early in 1929 this cycle abruptly changed phase by about 60 deg., 210 deg., and 160 deg., respectively, for these elements, resulting in changed relations between solar activity and the two geophysical...

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Veröffentlicht in:Proceedings of the IRE 1931-03, Vol.19 (3), p.353-355
1. Verfasser: Pickard, G.W.
Format: Artikel
Sprache:eng
Schlagworte:
Geophysical measurements
Harmonic analysis
Magnetic analysis
Magnetic field measurement
Meteorology
Observatories
Phase measurement
Smoothing methods
Sun
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Zusammenfassung:A marked 15-month period has been found in sun spots, terrestrial magnetism, and radio reception. Early in 1929 this cycle abruptly changed phase by about 60 deg., 210 deg., and 160 deg., respectively, for these elements, resulting in changed relations between solar activity and the two geophysical measures.
ISSN:0731-5996
0096-8390
2162-6626
DOI:10.1109/JRPROC.1931.222333