Articles | Volume 6, issue 1
Geosci. Instrum. Method. Data Syst., 6, 27–37, 2017
Geosci. Instrum. Method. Data Syst., 6, 27–37, 2017

Research article 27 Jan 2017

Research article | 27 Jan 2017

Martian magnetism with orbiting sub-millimeter sensor: simulated retrieval system

Richard Larsson1, Mathias Milz2, Patrick Eriksson3, Jana Mendrok3, Yasuko Kasai1, Stefan Alexander Buehler4, Catherine Diéval5, David Brain6, and Paul Hartogh7 Richard Larsson et al.
  • 1National Institute of Information and Communications Technology, Tokyo, Japan
  • 2Luleå University of Technology, Kiruna, Sweden
  • 3Chalmers University of Technology, Gothenburg, Sweden
  • 4University of Hamburg, Hamburg, Germany
  • 5Lancaster University, Lancaster, UK
  • 6University of Colorado, Boulder, USA
  • 7Max Planck Institute for Solar System Research, Göttingen, Germany

Abstract. A Mars-orbiting sub-millimeter sensor can be used to retrieve the magnetic field at low altitudes over large areas of significant planetary crustal magnetism of the surface of Mars from measurements of circularly polarized radiation emitted by the 368 GHz ground-state molecular oxygen absorption line. We design a full retrieval system for one example orbit to show the expected accuracies on the magnetic field components that one realization of such a Mars satellite mission could achieve. For one set of measurements around a tangent profile, we find that the two horizontal components of the magnetic field can be measured at about 200 nT error with a vertical resolution of around 4 km from 6 up to 70 km in tangent altitude. The error is similar regardless of the true strength of the magnetic field, and it can be reduced by repeated measurements over the same area. The method and some of its potential pitfalls are described and discussed.

Short summary
By computer simulations, we explore and quantify how to use radiation emitted by molecular oxygen in the Martian atmosphere to measure the magnetic field from the crust of the planet. This crustal magnetic field is important to understand the past evolution of Mars. Our method can measure the magnetic field at lower altitudes than has so far been done, which could give important information on the characteristics of the crustal sources if a mission with the required instrument is launched.