Ansan, Veronique

Banerdt, B.

Grott, Matthias

Johnson, Catherine L.

Joy, S.P.

Krause, Christian

Langlais, B.

Lognonne, A.P.

Mittelholz, Anna

Pike, W.T.

Russel, C.T.

Smrekar, S.

Spohn, Tilman

Widmer-Schnidrig, Rudolf

Yu, Yanan

Institute of Transport Research:Publications

Geophysical Research AbstractsVol. 21, EGU2019-3422-2, 2019EGU General Assembly 2019© Author(s) 2019. CC Attribution 4.0 license.First results from the InSight FluxGate Magnetometer: Constraints onMars’ crustal magnetic field at the landing siteAnna Mittelholz (1), Catherine L. Johnson (1,2), Benoit Langlais (3), Philippe Lognonne (4), William T. Pike (5),Steven P. Joy (6), Christopher T. Russell (6), Yanan Yu (6), Veronique Ansan (3), Matthias Grott (7), ChristianKrause (8), Tilman Spohn (7), Rudolf Widmer-Schnidrig (9), Suzanne E. Smrekar (10), and William B. Banerdt(10)(1) The University of British Columbia, Earth, Ocean and Atmospheric Sciences, Vancouver, Canada (amittelh@eoas.ubc.ca),(2) Planetary Science Institute, Tucson, USA, (3) Laboratoire de Planétologie et Géodynamique, Université de Nantes, Facultédes Sciences et Techniques, Nantes, France, (4) Université Paris Diderot-Sorbonne Paris Cité, Institut de Physique du Globede Paris, Paris, France, (5) Department of Electrical and Electronic Engineering, Imperial College, London, United Kingdom,(6) Earth, Planetary and Space Sciences, University of California, Los Angeles, USA, (7) German Aerospace Center (DLR),Institute of Planetary Research, Berlin, Germany, (8) MUSC, German Aerospace Center (DLR), Cologne, Germany, (9) BlackForest Observatory (BFO), Wolfach, Germany, (10) Jet Propulsion Laboratory, 4800 Oak Dr, Pasadena, USAThe Interior Exploration using Seismic Investigations, Geodesy and Heat Transport (InSight) mission successfullylanded on Mars on 26 November, 2018 at 4.50◦N, 135.62◦E in Elysium Planitia. The Insight FluxGate magne-tometer (IFG) is part of the Auxiliary Payload Sensor Suite (APSS) of instruments that will monitor environmentalconditions at the lander, for the primary purpose of accounting for sources of wind, temperature, pressure andmagnetic field noise in the seismic data. The IFG is the first magnetometer to be deployed on the surface of Mars,and thus affords unique opportunities for magnetic field-based studies of the martian interior, the ionosphere, andthe extent to which conditions in the solar wind affect the martian surface environment. In this, and a companionpaper (Russell et et al., 2019), we report on initial results from the IFG instrument. Here, we focus on approachesfor estimating the local crustal magnetic field at the InSight lander, yielding the first surface-based estimates ofMars’ crustal magnetic field.We use two approaches to estimate the local crustal field: (1) In theory, IFG data can provide a direct estimate ofthe crustal field via the DC field. However, such estimates require accurate characterization of the DC spacecraftfield, with instruments in their deck and/or deployed configurations. Characterization of spacecraft fields prior tolanding provide estimates for the magnitude of the spacecraft field of∼700 nT. (2) Vibrations of the InSight landerin response to the daily winds have been recorded by the Short Period sensors of the seismic experiment SEIS.These high frequency tilts result in accelerations and magnetic field perturbations that may be detectable on theshort-period seismometer, SP, and the IFG respectively. Calculations based on Viking data prior to InSight groundoperations, suggested that wind speeds of at least 10 m/s expected at the InSight landing site, would produce landertilts of ∼ 10−4 degrees. These in turn could produce magnetic field perturbations on the IFG resolvable with ∼20hrs of data. Measurement of the horizontal signals on SP and the horizontal perturbations to the magnetic field inthe resonance frequency band of the lander allow a least squares solution for the vertical component, BZ , of theambient crustal magnetic field. Accordingly, over 40 hours of simultaneous IFG and SP data have been collectedwhile the SP is on deck and we will report on results from these data.

First Results from the InSight Fluxgate Magnetometer: Constraints on Mars' Crustal Magnetic Field at the InSight Landing Site

https://elib.dlr.de/127249/1/EGU2019-3422-2.pdf

First Results from the InSight Fluxgate Magnetometer: Constraints on Mars' Crustal Magnetic Field at the InSight Landing Site

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