Title: Interest
and design of magnetic properties measurements on planetary and
asteroidal landers
Author(s): Rochette
P, Gattacceca J, Menvielle M, Eisenlohr P, Chevrier V
Source: PLANETARY
AND SPACE SCIENCE 52 (11): 987-995 SEP 2004
Document Type: Article
Language: English
Abstract: Intrinsic
magnetic properties, like susceptibility, provide a precise
determination of the iron phases with a penetration depth not available
with other chemical and mineralogical sensing tools, thus allowing to
unravel space weathering effects. Systematic measurements of meteorites
demonstrate that susceptibility measurements on asteroid surface could
be a very efficient way to assign a meteorite class to a given
asteroid. Another application could be the characterization of the
highly magnetic Martian regolith. On the other hand, natural remanent
magnetization (NRM) measurements are crucial to interpret magnetic
field anomalies such as those found on Mars and Moon, and likely to be
found on Mercury. NRM gives also access to past magnetic fields and
extinct planetary dynamo. Rugged, light and low consumption systems
already exist for such measurements on Earth and we present a scheme to
integrate both magnetic susceptibility (using a LC oscillator) and NRM
(using a 3 axis fluxgate or a gradiometer) to offer a versatile
instrument package for any mission involving a lander. For the LC
oscillator calibration of the geometric factor is presented. The
fluxgate can be used both for making local magnetic anomaly maps, thus
investigating subsurface structures, and for evaluating NRM of
individual boulders. (C) 2004 Elsevier Ltd. All rights reserved.
Author Keywords: lander;
magnetic properties; Mars; remanence; susceptibility
KeyWords Plus: MARTIAN
SOIL; SUSCEPTIBILITY MEASUREMENTS; MARS PATHFINDER; FIELD;
MAGNETOMETER; METEORITES; ONBOARD; SURFACE; EXPLORATION; CALIBRATION
Addresses: Rochette
P (reprint author), Univ Aix Marseille 3, CNRS, UMR 6635, CEREGE, BP80
13545, Aix En Provence, F-13545 4 France
Univ Aix Marseille 3, CNRS, UMR 6635, CEREGE, Aix En Provence, F-13545
4 France
CNRS, CETP, UMR 8639, St Maur, F-94107 France
Publisher: PERGAMON-ELSEVIER
SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB,
ENGLAND
Subject Category: ASTRONOMY
& ASTROPHYSICS
IDS Number: 863BU
ISSN: 0032-0633