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Paleopole Investigation of Martian Magnetic Field Anomalies

Thomas, Paul (2019) Paleopole Investigation of Martian Magnetic Field Anomalies. Dissertation, Technische Universität Berlin.

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Official URL: http://dx.doi.org/10.14279/depositonce-8724

Abstract

Ever since the start of the space era, magnetometer carrying spacecrafts were sent to measure the magnetic fields of the Earth and other terrestrial planets in the solar system. The first attempt to measure the magnetic field of Mars was during the flyby of the Mariner 4 spacecraft and it was concluded that unlike Earth a current core dynamo is absent. Even though magnetometer carrying spacecrafts approached Mars in the following decades, it was not until 1997 that the Mars Global Surveyor (MGS) mission discovered a strong remanent magnetic field originating from the Martian crust. Ever since, the results of MGS were integrated in local and global magnetic field models, which were eventually used for paleopole reconstruction. By comparing all paleopole investigations since the year 2001 it was revealed that determined paleopole locations are widely spread all over the Martian surface and it was therefore an objective of this study to find the reason for the spread and give an estimate of uncertainty for paleopole locations on Mars. From synthetic tests, as well as tests on real data, it can be concluded that perturbation in the measured magnetic signal causes residuals in the determined paleopole location, which explains the spread found in earlier studies. Eight Martian magnetic field anomalies were investigated in detail and the determined areas of admissible paleopole locations show a mean surface coverage of 35.5%. These areas constrain paleopole locations to either the northern or southern hemisphere as well as an area in the mid-latitudes. It could therefore be concluded that Mars underwent at least one polar reversal and an event of true polar wander in its past.

Item URL in elib:https://elib.dlr.de/132204/
Document Type:Thesis (Dissertation)
Title:Paleopole Investigation of Martian Magnetic Field Anomalies
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Thomas, PaulPaul.Thomas (at) dlr.dehttps://orcid.org/0000-0001-6884-6422
Date:9 September 2019
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:115
Status:Published
Keywords:Polar Reversal, True Polar Wander, Paleopole Reconstruction, Equivalence Source Dipole Method, Martian Magnetic Field
Institution:Technische Universität Berlin
Department:Fakultät II - Mathematik und Naturwissenschaften
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 Planetary Evolution and Life
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Thomas, Paul
Deposited On:05 Dec 2019 15:13
Last Modified:05 Dec 2019 15:13

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