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A spherical harmonic model of the lithospheric magnetic field of Mars

Morschhauer, A. and Lesur, V and Grott, M. (2014) A spherical harmonic model of the lithospheric magnetic field of Mars. JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 119 (6), pp. 1162-1188. Wiley. DOI: 10.1002/2013JE004555 ISSN 2169-9097

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/2013JE004555/abstract

Abstract

We present a model of the lithospheric magnetic field of Mars which is based on Mars Global Surveyor orbiting satellite data and represented by an expansion of spherical harmonic (SH) functions up to degree and order 110. Several techniques were applied in order to obtain a reliable and well-resolved model of the Martian lithospheric magnetic field: A modified Huber-Norm was used to properly treat data outliers, the mapping phase orbit data was weighted based on an a priori analysis of the data, and static external fields were treated by a joint inversion of external and internal fields. Further, temporal variabilities in the data which lead to unrealistically strong anomalies were considered as noise and handled by additionally minimizing a measure of the horizontal gradient of the vertically down internal field component at surface altitude. Here we use an iteratively reweighted least squares algorithm to approach an absolute measure (L1 norm), allowing for a better representation of strong localized magnetic anomalies as compared to the conventional least squares measure (L2 norm). The resulting model reproduces all known characteristics of the Martian lithospheric field and shows a rich level of detail. It is characterized by a low level of noise and robust when downward continued to the surface. We show how these properties can help to improve the knowledge of the Martian past and present magnetic field by investigating magnetic signatures associated with impacts and volcanoes. Additionally, we present some previously undescribed isolated anomalies, which can be used to determine paleopole positions and magnetization strengths.

Item URL in elib:https://elib.dlr.de/114234/
Document Type:Article
Title:A spherical harmonic model of the lithospheric magnetic field of Mars
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Morschhauer, A.Helmholtz Centre Potsdam GFZ German Research Centre for GeosciencesUNSPECIFIED
Lesur, VNational Magnetic Observatory GeomagnetismUNSPECIFIED
Grott, M.matthias.grott (at) dlr.deUNSPECIFIED
Date:9 June 2014
Journal or Publication Title:JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:119
DOI :10.1002/2013JE004555
Page Range:pp. 1162-1188
Editors:
EditorsEmail
Hauck, S.A.Steven A. Hauck, II, Department of Earth, Environmental, and Planetary Sciences Case Western Reserve University 10900 Euclid Avenue Cleveland, OH 44106-7216
Publisher:Wiley
ISSN:2169-9097
Status:Published
Keywords:Mars, magnetic field, magnetic anomalies, spherical harmonics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Institute of Planetary Research > Planetary Physics
Deposited By: Rückriemen, Tina
Deposited On:20 Sep 2017 10:32
Last Modified:20 Sep 2017 10:32

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