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160 m Pulsations in the Magnetosphere of the Earth Possibly Caused by Oscillations of the Sun*

Published online by Cambridge University Press:  12 April 2016

B.M. Vladimirsky ,
V.P. Bobova ,
N.M. Bondarenko  and
V.K. Veretennikova
B.M. Vladimirsky
Affiliation:
Crimean Astrophysical Observatory, Nauchny, Crimea 334413, U.S.S.R.
V.P. Bobova
Affiliation:
Crimean Astrophysical Observatory, Nauchny, Crimea 334413, U.S.S.R.
N.M. Bondarenko
Affiliation:
Crimean Astrophysical Observatory, Nauchny, Crimea 334413, U.S.S.R.
V.K. Veretennikova
Affiliation:
Crimean Astrophysical Observatory, Nauchny, Crimea 334413, U.S.S.R.

Abstract

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The measurements of the amplitudes envelope of Pc 3–4 geomagnetic micropulsations obtained at the Borok Geophysical Observatory were analysed by the cosinor method to search for magnetospheric pulsations with a period of about 160 m. 216 days of observations in 1974–1978 were used. It was found that Pc3–4 amplitudes are modulated by the period 160.010 m with a stable phase. The maximum of the Pc3–4 amplitudes follows approximately 20 m after the maximum of the solar expansion velocity (for the center of the disk) in the optical observations of Severny et al. This modulation of the Pc3–4 amplitudes could be caused by the presence of an oscillating component in solar UV radiation over the wavelength range 100-900 Å. The amplitude of the UV flux variation may be as large as 2–4%.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 66: Problems of Solar and Stellar Oscillations , 1983 , pp. 451 - 455
Copyright
Copyright © Reidel 1983

Footnotes

*

Proceedings of the 66th IAU Colloquium: Problems in Solar and Stellar Oscillations, held at the Crimean Astrophysical Observatory, U.S.S.R., 1–5 September, 1981.

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