The Forward and Adjoint Methods of Global Electromagnetic Induction forCHAMP Magnetic Data

2012 ◽  
Keyword(s):  
Electromagnetic Induction ◽  
Magnetic Data ◽  
Adjoint Methods

Electromagnetic induction revealed by MESSENGER's vector magnetic data: The size of Mercury's core

Icarus ◽  
2021 ◽  
Vol 354 ◽  
pp. 114112
Author(s):  
Taka’aki Katsura ◽  
Hisayoshi Shimizu ◽  
Naoya Momoki ◽  
Hiroaki Toh
Keyword(s):  
Electromagnetic Induction ◽  
Magnetic Data

scholarly journals Wavelet characterization of external magnetic sources as observed by CHAMP satellite: evidence for unmodelled signals in geomagnetic field models

2013 ◽  
Vol 192 (3) ◽  
pp. 946-950 ◽  
Author(s):  
Praveen Kunagu ◽  
Georgios Balasis ◽  
Vincent Lesur ◽  
E. Chandrasekhar ◽  
C. Papadimitriou
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Induction ◽  
External Source ◽  
Source Model ◽  
Magnetic Data ◽  
Satellite Mission ◽  
Champ Satellite ◽  
Geomagnetic Field Models ◽  
Source Signals

Abstract We apply continuous wavelet transform technique to the full decade (2001–2010) of CHAMP vector magnetic data from 55417 tracks, to search for evidences of external source field signatures that are either misunderstood or ignored in modern magnetic field models. We show that satellite magnetic time-series, after subtracting the main and lithospheric field contributions, exhibit several external source signals. Other than the diurnal, 27-day, and annual periodicities, we also have observed the 210-day periodicity, in the external magnetic field. Central to these observations is the local time dependency of 27-day variations, which suggests that the purely zonal source model, generally considered for the estimation of electromagnetic induction response is inadequate. We discuss the origin and characteristics of 210-day periodicity, although its geophysical significance needs to be fully ascertained. A better understanding of the external fields as seen at satellite altitude is a prerequisite for an optimum exploitation of Swarm multi-satellite mission, which is scheduled for launch in 2013.

Electron excess and electromagnetic induction effect of extensive air showers

2010 ◽  
Vol 16 (3) ◽  
pp. 3-14 ◽  
Author(s):  
V.M. Kartashev ◽  
◽  
P.S. Kizim ◽  
V.E. Kovtun ◽  
S.N. Stervoiedov ◽  
...  
Keyword(s):  
Electromagnetic Induction ◽  
Extensive Air Showers ◽  
Induction Effect ◽  
Air Showers
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