Low-altitude magnetic field measurements by MESSENGER reveal Mercury’s ancient crustal field

Author:

Johnson Catherine L.12,Phillips Roger J.3,Purucker Michael E.4,Anderson Brian J.5,Byrne Paul K.67,Denevi Brett W.5,Feinberg Joshua M.8,Hauck Steven A.9,Head James W.10,Korth Haje5,James Peter B.11,Mazarico Erwan4,Neumann Gregory A.4,Philpott Lydia C.1,Siegler Matthew A.212,Tsyganenko Nikolai A.13,Solomon Sean C.117

Affiliation:

1. Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada.

2. Planetary Science Institute, Tucson, AZ 85719, USA.

3. Planetary Science Directorate, Southwest Research Institute, Boulder, CO 80302, USA.

4. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA.

5. The Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, USA.

6. Lunar and Planetary Institute, Houston, TX 77058, USA.

7. Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015, USA.

8. Institute for Rock Magnetism, Department of Earth Sciences, University of Minnesota, Minneapolis, MN, 55455, USA.

9. Department of Earth, Environmental, and Planetary Sciences, Case Western Reserve University, Cleveland, OH, 44106, USA.

10. Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI 02912, USA.

11. Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, USA.

12. Department of Earth Sciences, Southern Methodist University, Dallas, TX 75205, USA.

13. Institute and Faculty of Physics, Saint Petersburg State University, Saint Petersburg, Russia.

Abstract

Old minerals expose an ancient field Mercury is the only terrestrial planet other than Earth with an active, internally generated magnetic field. Results from the MESSENGER spacecraft indicate that the field is almost as old as the planet. Johnson et al. took advantage of close flybys to extract evidence of an ancient magnetic field. Certain minerals are able to “lock in” the signature of a field at the time they crystallize. This remnant magnetization was found in a region on Mercury believed to be 3.8 billion years old. Science , this issue p. 892

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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