Open Access

Application of satellite magnetic observations for estimating near-surface magnetic anomalies

  • Hyung Rae Kim14Email author,
  • Ralph R. B. von Frese24,
  • Alexander V. Golynsky34,
  • Patrick T. Taylor44 and
  • Jeong Woo Kim54
Earth, Planets and Space201456:BF03351793

https://doi.org/10.1186/BF03351793

Received: 12 January 2004

Accepted: 1 September 2004

Published: 20 June 2014

Abstract

Regional to continental scale magnetic anomaly maps are becoming increasingly available from airborne, shipborne, and terrestrial surveys. Satellite data are commonly considered to fill the coverage gaps in regional compilations of these near-surface surveys. For the near-surface Antarctic magnetic anomaly map being produced by the Antarctic Digital Magnetic Anomaly Project (ADMAP), we show that near-surface magnetic anomaly estimation is greatly enhanced by the joint inversion of the near-surface data with Ørsted satellite observations compared to Magsat data that have order-of-magnitude greater measurement errors, albeit collected at much lower orbital altitudes. The CHAMP satellite is observing the geomagnetic field with the same measurement accuracy as the Ørsted mission, but at the lower orbital altitudes covered by Magsat. Hence, additional significant improvement in predicting near-surface magnetic anomalies can result as lithospheric magnetic anomaly data from the CHAMP mission become available. Our analysis also suggests that a further order-of-magnitude improvement in the accuracy of the magnetometer measurements at minimum orbital altitude may reveal considerable new insight into the magnetic properties of the lithosphere.

Key words

Crustal magnetic anomaly satellite data ADMAP least squares inversion