On the Observability of the Time-Variable Lithospheric Signal in Satellite Magnetic Data

0511932 - ASÚ 2020 RIV NL eng J - Journal Article
Sebera, Josef - Haagmans, R. - Bakyiev, E. - Bezděk, Aleš
On the Observability of the Time-Variable Lithospheric Signal in Satellite Magnetic Data.
Surveys in Geophysics. Roč. 40, č. 5 (2019), s. 1229-1243. ISSN 0169-3298. E-ISSN 1573-0956
R&D Projects: GA MŠMT(CZ) LG15003
Institutional support: RVO:67985815
Keywords : geomagnetic field * lithosphere * Swarm
OECD category: Physical geography
Impact factor: 5.544, year: 2019
Method of publishing: Limited access
https://doi.org/10.1007/s10712-019-09546-8

We first inverted the magnetic field vector from CHAOS-6 over degrees 21-120, after subtraction of a remanent model, to a vertically integrated susceptibility map. Using this susceptibility distribution and taking into account the evolving core fields from the CHAOS-6 model, the time-varying lithospheric signal is computed. The results depend on the time span and the altitude considered, e.g., an altitude of 400 km and a span of 17 years can produce more than 0.5 nT variations resulting in a peak-to-peak value of nearly 1 nT. The vertically integrated quantities appear to be a useful choice for parameterising lithospheric time variations, also for providing data corrections at the satellite altitude. The effect of the choice of the core field, which enters the inversion, on the lithospheric time variation is also studied-this effect is found less important even for core fields 20 years apart.
Permanent Link: http://hdl.handle.net/11104/0302170