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| Titel |
Accuracy of multi-point boundary crossing time analysis |
| VerfasserIn |
J. Vogt, S. Haaland, G. Paschmann |
| 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 ; 29, no. 12 ; Nr. 29, no. 12 (2011-12-10), S.2239-2252 |
| Datensatznummer |
250017142
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| Publikation (Nr.) |
 copernicus.org/angeo-29-2239-2011.pdf |
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| Zusammenfassung |
| Recent multi-spacecraft studies of solar wind discontinuity crossings
using the timing (boundary plane triangulation) method gave boundary
parameter estimates that are significantly different from those of the
well-established single-spacecraft minimum variance analysis (MVA) technique.
A large survey of directional discontinuities in Cluster data turned out
to be particularly inconsistent in the sense that multi-point timing
analyses did not identify any rotational discontinuities (RDs) whereas the
MVA results of the individual spacecraft suggested that RDs form the majority
of events. To make multi-spacecraft studies of discontinuity crossings more
conclusive, the present report addresses the accuracy of the timing approach
to boundary parameter estimation. Our error analysis is based on the reciprocal
vector formalism and takes into account uncertainties both in crossing times
and in the spacecraft positions. A rigorous error estimation scheme is
presented for the general case of correlated crossing time errors
and arbitrary spacecraft configurations. Crossing time error covariances
are determined through cross correlation analyses of the residuals.
The principal influence of the spacecraft array geometry on the accuracy of
the timing method is illustrated using error formulas for the simplified
case of mutually uncorrelated and identical errors at different spacecraft.
The full error analysis procedure is demonstrated for a solar wind
discontinuity as observed by the Cluster FGM instrument. |
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