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| Titel |
GALS – Gradient Analysis by Least Squares |
| VerfasserIn |
M. Hamrin, K. Rönnmark, N. Börlin, J. Vedin, A. Vaivads |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 26, no. 11 ; Nr. 26, no. 11 (2008-11-10), S.3491-3499 |
| Datensatznummer |
250016288
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| Publikation (Nr.) |
 copernicus.org/angeo-26-3491-2008.pdf |
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| Zusammenfassung |
We present a method, GALS (Gradient Analysis by Least Squares) for
estimating the gradient of a physical field from multi-spacecraft
observations. To obtain the best possible spatial resolution, the
gradient is estimated in the frame of reference where structures in
the field are essentially locally stationary. The
estimates are refined iteratively by a least squares method.
We show that GALS is not very sensitive to the spacecraft
configuration and resolves structures much smaller than the
characteristic size of the spacecraft distribution. Furthermore,
GALS requires little user input.
GALS has been tested on synthetic magnetic field data and data from
the Cluster FGM instrument. GALS will also be useful for other types
of data. The results indicate that GALS is robust and superior to
the curlometer method for estimating the current from magnetic field
measurements. |
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