Some fresh indications of the solar origin of 4-6-year oscillation of the Earth’s rotation parameters
The variations of universal times difference UT1-TAI and Earth’s rotation instantaneous pôle coordinates (X,Y) are studied in the frequency range of 3 - 8 yr−1 as a function of the solar activity. It is found that power spectrum concentrations C1 and C2 are common to solar activity indicato...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Astronomical Observatory, Department of Astronomy, Belgrade
1999-01-01
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| Series: | Serbian Astronomical Journal |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-698X/1999/1450-698X9959001D.pdf |
| Summary: | The variations of universal times difference UT1-TAI and Earth’s rotation
instantaneous pôle coordinates (X,Y) are studied in the frequency range of 3
- 8 yr−1 as a function of the solar activity. It is found that power spectrum
concentrations C1 and C2 are common to solar activity indicators and Earth’s
rotation parameters (ERP). The linear correlation between them is also not a
fortuitous one. Accordingly, by the results of this study the hypothesis of
Djurovic and Pâquet (1996; 1999) that the primary cause of 4-6 year
oscillation lies in solar irradiance is confirmed. Between several mechanisms
responsible for the ERP variations as the most probable are considered the
variations of solar irradiance spectral structure (especially large in its UV
range) and variations of intensity of cosmic X-rays reaching the Earth’s
surface. |
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| ISSN: | 1450-698X 1820-9289 |