Combination of geo-magnetic jerks with updated ESMGFZ effective angular momentum functions for the modelling of polar motion excitation

0521618 - ASÚ 2020 RIV CZ eng J - Journal Article
Ron, Cyril - Vondrák, Jan - Dill, R. - Chapanov, Y.
Combination of geo-magnetic jerks with updated ESMGFZ effective angular momentum functions for the modelling of polar motion excitation.
Acta geodynamica et geomaterialia. Roč. 16, č. 4 (2019), s. 359-363. ISSN 1214-9705. E-ISSN 2336-4351
Institutional support: RVO:67985815
Keywords : polar motion * geophysical excitation * geomagnetic jerks
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 1.227, year: 2019
Method of publishing: Open access

We use numerical integration of Brzezinski's broad-band Liouville equations with the new atmospheric/oceanic excitations provided by GFZ Potsdam to calculate their effect on polar motion. There exist several studies hinting that geomagnetic jerks, sudden changes of intensity of geomagnetic field, can also affect polar motion. We concentrate our efforts to study possible influence of geomagnetic jerks on temporal changes of polar motion. We demonstrate that the fit between integrated and polar motion observed by space geodesy improves substantially, if the influence of geomagnetic jerks is added to excitations by geophysical fluids. We also applied additional excitations due to the continental hydrosphere and barystatic sea-level variations. Although these effects complete the geophysical fluids system, their adding could not improve the agreement between integrated and observed polar motion.
Permanent Link: http://hdl.handle.net/11104/0306222