Solar excitation of bicentennial Earth rotation oscillations

0382862 - ASÚ 2013 RIV CZ eng J - Journal Article
Ron, Cyril - Chapanov, Y. - Vondrák, Jan
Solar excitation of bicentennial Earth rotation oscillations.
Acta geodynamica et geomaterialia. Roč. 9, č. 3 (2012), s. 259-268. ISSN 1214-9705. E-ISSN 2336-4351
R&D Projects: GA ČR GA205/08/0908
Grant - others:Bulgarian NSF(BG) DO02-275; FP7(BG) MCA PIRSES-GA-2009-246874
Institutional support: RVO:67985815
Keywords : Earth rotation * solar activity
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics
Impact factor: 0.530, year: 2011

The bicentennial variations of the Earth rotation consist of several oscillations with most known periods 178.7a (Jose cycle), 210a and 230a (de Vries cycle); they are driven by the solar cycles which affect climatic variations, followed by global environmental changes. These periods are close to the higher harmonics of millennial Hallstatt cycle (2300a), so the proper separation between the individual bicentennial cycles needs time series longer than 2300a. The bicentennial variations of the Universal Time (UT1) in relation to the Terrestrial Time (TT) are investigated using reconstructed time series of the Total Solar Irradiance (TSI) for the last 9300a. A linear regression model of TSI influence on the UT1 and the Mean Sea Level (MSL) bicentennial variations are created. The parameters and time series of the bicentennial UT1-TT oscillations for the last 9300a are determined.
Permanent Link: http://hdl.handle.net/11104/0212971