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| Titel |
Why the 18.6 year tide cannot explain the change of sign observed in j2 |
| VerfasserIn |
F. Deleflie, P. Exertier, G. Metris, P. Berio, O. Laurain, J.-M. Lemoine, R. Biancale |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: G1. The new gravity field mission (CHAMP, GRACE, GOCE): from measurements to geophysical interpretation ; Nr. 1 (2003-06-30), S.103-108 |
| Datensatznummer |
250000042
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| Publikation (Nr.) |
 copernicus.org/adgeo-1-103-2003.pdf |
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| Zusammenfassung |
Recent studies show a change, starting in 1998, in
the behavior of the variation of the dynamical flattening of
the Earth (J2), supposed to be constant (secular), and mainly
due to the post glacial rebound effect.
In this paper, we study to what extent this behavior can
be correlated or not with the 18.6 year tide: with more than
twenty years of tracking data on LAGEOS-1, that is to say
more than a period of 18.6 years, this effect can now be separated
from the secular variation.
We use our theory of mean orbital motion, dedicated to
studies of the long period effects on the orbital motion. We
build one single arc of LAGEOS-1 from 1980 to 2002, which
provides a continuous description of the orbital parameters.
This is the great originality of our approach.
We focus our attention on the ascending node of
LAGEOS-1, and we show that the change observed in j2
cannot be attributed to a statistical error due to a correlation,
in short arcs results, between the secular variation of J2 and
the 18.6 year tide. The proof is based on the adjustment of
amplitudes and phases of the long period tides, and on the
shape of the residuals.
Key words. secular variation of J2, 18.6 year tide, mean orbital
motione |
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