Analysis of Satellite Magnetic Data

Jon Turner; Denis Winch; David Ivers; Robert Stening

doi:10.1071/EG05317

ISSN: 0812-3985
E-ISSN: 1834-7533

Analysis of Satellite Magnetic Data
Authors Jon Turner^a, Denis Winch^a, David Ivers^a and Robert Stening^b
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^a School of Mathematics and Statistics, University of Sydney F07, Sydney, , NSW, 2006, Phone (61-2) 9351-3235, Facsimile (61-2) 9351-4534, [email protected] ^b School of Physics, University of New South Wales, , Sydney, NSW, 2052
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 36, Issue 3, Sep 2005, p. 310 - 316
DOI: https://doi.org/10.1071/EG05317
- Received: 17 Aug 2004
- Accepted: 15 Mar 2005
- Published online: 01 Sep 2005

Abstract

Night-time measurements of the Earth’s undisturbed, quiet magnetic field at satellite altitudes provide models of the main field and its secular variation, and of the crustal magnetic anomaly field. Fields from the regular daily variations of solar and lunar origin are most pronounced in daytime data and can affect aeromagnetic and ground magnetic surveys. Satellite magnetic data in total intensity are now available across all local times, and for the first time it is possible to determine the regular daily variations in the ionosphere-magnetosphere region. We give the daily variation in total intensity at satellite altitudes for six equally spaced Universal Time epochs each covering daytime and night-time, showing clearly the equatorial electrojet and Sq current system above the ionosphere during daytime hours. Also given are crustal magnetic anomaly maps, based on high-degree residuals in main field data, for the world and the Australian region at satellite altitudes. The daily variations and crustal magnetic anomalies at satellite levels are both of the order of 20 nT.

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References

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Article Type: Research Article

Keyword(s): crustal magnetic anomalies; Equatorial electrojet; ionosphere; Sq

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Analysis of Satellite Magnetic Data

Abstract

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