Geophysical fluids, geomagnetic jerks, and their impact on Earth orientation

0486689 - ASÚ 2018 RIV RS eng J - Journal Article
Vondrák, Jan - Ron, Cyril
Geophysical fluids, geomagnetic jerks, and their impact on Earth orientation.
Publications of the Astronomical Observatory of Belgrade. Roč. 96, č. 1 (2017), s. 51-60. ISSN 0373-3742.
[National Conference of Astronomers of Serbia /17./. Belgrade, 23.09.2014-27.09.2014]
R&D Projects: GA ČR GA13-15943S
Institutional support: RVO:67985815
Keywords : Earth orientation * geophysical fluids * geomagnetic jerks
OECD category: Physical geography

We introduce a simple continuous excitation function (having a ”double ramp”, or triangular, shape), centered on the epochs of geomagnetic jerks, and estimate its amplitude to fit best the integrated pole positions to its observed positions. The combined results of numerical integration of atmospheric/oceanic excitations plus this newly introduced excitation are then compared with the observed celestial pole offsets. The comparison shows that this approach improves the agreement between the two time series significantly.
Permanent Link: http://hdl.handle.net/11104/0281435