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AGU: Geophysical Research Letters

 

Keywords

  • magnetic
  • gradiometry
  • lithosphere

Index Terms

  • Geomagnetism and Paleomagnetism: Instruments and techniques
  • Geomagnetism and Paleomagnetism: Magnetic anomalies: modeling and interpretation
  • Geomagnetism and Paleomagnetism: Spatial variations: all harmonics and anomalies
  • Geomagnetism and Paleomagnetism: Satellite magnetics: main field, crustal field, external field
  • Geomagnetism and Paleomagnetism: Planetary magnetism: all frequencies and wavelengths

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 34, L24306, 6 PP., 2007
doi:10.1029/2007GL031739

Magnetic field gradients from the ST-5 constellation: Improving magnetic and thermal models of the lithosphere

M. Purucker

Raytheon at Planetary Geodynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA

T. Sabaka

Raytheon at Planetary Geodynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA

G. Le

Heliophysics Sciences Division, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA

J. A. Slavin

Heliophysics Sciences Division, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA

R. J. Strangeway

Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California, USA

C. Busby

Department of Earth Sciences, University of California, Santa Barbara, California, USA

We report the development of a new technique (magnetic gradiometry) for satellite-based remote sensing of the lithosphere. The measurements reported here represent the first systematic measurements of lithospheric magnetic field gradients, and were collected from a spinning spacecraft. The three-satellite ST-5 mission collected vector magnetic field observations at 300–800+ km altitudes over mid and high-northern latitudes in 2006. Away from the auroral oval, and over the continents, the gradients of the low altitude (<400 km) total anomaly field are dominated by lithospheric magnetic fields. Using a seismic starting model, and magnetic field observations from ST-5 and other recent satellite missions, we demonstrate how these techniques can be used to improve our knowledge of the processes involved in the thickened crust of the Colorado Plateau and the Sierra Madre Occidental.

Received 20 August 2007; accepted 6 November 2007; published 25 December 2007.

Citation: Purucker, M., T. Sabaka, G. Le, J. A. Slavin, R. J. Strangeway, and C. Busby (2007), Magnetic field gradients from the ST-5 constellation: Improving magnetic and thermal models of the lithosphere, Geophys. Res. Lett., 34, L24306, doi:10.1029/2007GL031739.

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