The adjoint-state method for the downward continuation of the geomagnetic field

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F15%3A10314943" target="_blank" >RIV/00216208:11320/15:10314943 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1093/gji/ggv049" target="_blank" >http://dx.doi.org/10.1093/gji/ggv049</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/gji/ggv049" target="_blank" >10.1093/gji/ggv049</a>

Result language

angličtina

Original language name

The adjoint-state method for the downward continuation of the geomagnetic field

Original language description

The downward continuation of the observed geomagnetic field from the Earth's surface to the core-mantle boundary (CMB) is complicated due to induction and diffusion processes in the electrically conducting Earth mantle, which modify the amplitudes and morphology of the geomagnetic field. Various methods have been developed to solve this problem, for example, the perturbation approach by Benton & Whaler, or the non-harmonic downward continuation by Ballani et al. In this paper, we present a new approachfor determining the geomagnetic field at the CMB by reformulating the ill-posed, one-sided boundary-value problem with time-variable boundary-value function on the Earth's surface into an optimization problem for the boundary condition at the CMB. The reformulated well-posed problem is solved by a conjugate gradient technique using the adjoint gradient of a misfit. For this purpose, we formulate the geomagnetic adjoint-state equations for efficient computations of the misfit gradient. Be

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

DE - Earth magnetism, geodesy, geography

OECD FORD branch

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Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2015

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Geophysical Journal International

ISSN

0956-540X

e-ISSN

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Volume of the periodical

201

Issue of the periodical within the volume

2

Country of publishing house

GB - UNITED KINGDOM

Number of pages

17

Pages from-to

724-740

UT code for WoS article

000355320500014

EID of the result in the Scopus database

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