Abstract
This study presents results of mapping three-dimensional (3-D) variations of the electrical conductivity in a depths range from 400 to 1200 km using six years of magnetic data from the Swarm and CryoSat-2 satellites as well as from ground
observatories. The approach involves the 3-D inversion of matrix Q-responses (transfer functions) that relate spherical harmonic coecients of external (inducing) and internal (induced) origin of the magnetic potential. Transfer functions were estimated from geomagnetic eld variations at periods ranging from 2 to 40 days. We study the eect of dierent combinations of input data sets on the transfer functions. We also present a new global 1-D conductivity prole based on a joint analysis of satellite tidal signals and global magnetospheric Q-responses.
observatories. The approach involves the 3-D inversion of matrix Q-responses (transfer functions) that relate spherical harmonic coecients of external (inducing) and internal (induced) origin of the magnetic potential. Transfer functions were estimated from geomagnetic eld variations at periods ranging from 2 to 40 days. We study the eect of dierent combinations of input data sets on the transfer functions. We also present a new global 1-D conductivity prole based on a joint analysis of satellite tidal signals and global magnetospheric Q-responses.
Original language | English |
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Article number | 67 |
Journal | Earth, Planets and Space |
Volume | 73 |
Number of pages | 26 |
ISSN | 1343-8832 |
DOIs | |
Publication status | Published - 2021 |
Bibliographical note
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- Electromagnetic induction
- Three-dimensional conductivity models
- Matrix Q-responses
- Inversion
- Time-varying magnetic field
- Magnetospheric ring-current source
- Satellite data
- Observatory data