Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.270..159t&link_type=abstract
Nature, vol. 270, Nov. 10, 1977, p. 159, 160. Research supported by the Magyar Allami Eotvos Lorand Geofizikai Intezet.
Physics
12
Geomagnetism, Magnetic Variations, Periodic Variations, Pulsars, Solar Radiation, Amplitudes, Interplanetary Magnetic Fields, Magnetospheric Instability, Solar Activity Effects, Solar Spectra
Scientific paper
Measured variations in earth's magnetic field with amplitudes of 50 to 100 nT are analyzed from the viewpoint of effects caused by pulsations of solar origin. Amplitude spectra characteristic of several magnetically active days are presented which indicate a significant amplitude peak around a period of 2 hr 40 min. These results are interpreted by assuming that the period of 2 hr 40 min is of solar origin, that interplanetary-magnetic-field variations produced by the sun's pulsation perturb the geomagnetic field, and that earth's magnetosphere intertwines with magnetic lines of force of the interplanetary field during magnetically active cycles. It is suggested that the sun has a radial-mode fundamental oscillation with a period in the range of 2 hr 40 min.
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