Izvestiya of Saratov University.

Earth Sciences

ISSN 1819-7663 (Print)
ISSN 2542-1921 (Online)


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Russian
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Article type: 
Article
UDC: 
551.58

Changes in the Insolation, Caused by the Planetary Perturbations of the Earth’s Orbit and by Variation in the Solar Constant

Autors: 
Bogdanov Mikhail Borisovich, Saratov State University
Katruschenko Aleksey Victorovich, Saratov State University
Surkov Alexander Nikolaevich, Saratov State University
Abstract: 

With the use of modern numerical methods of celestial mechanics, the incoming irradiance flux to the Earth from the Sun has been calculated under the assumption of the invariability of its luminosity through interval of 1700–2000 A.D. Harmonics of the annual period of the Earth as well as harmonics of the synodic period of Venus, Mars, Jupiter, Saturn and harmonics corresponded to combination frequencies, are clearly visible in the power spectrum of time series of the insolation. The periods of these harmonics are located in the range from 100 days to 15.7 years. The main harmonics in the power spectrum are corresponded to the synodic period of Jupiter 399d.0, and the first harmonic of the synodic period of Venus with period 291d.9. Their amplitudes are approximately equal to 40 mW/m2. The power spectrum of time series of real changes of the insolation during 1978–2005, which was caused by the planetary perturbations and variation in the solar constant, has been also calculated. Influence of planetary harmonics was also observed in this spectrum together with the 11-year cycle of the solar activity. 

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