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| Titel |
Multifractal analysis of low-latitude geomagnetic fluctuations |
| VerfasserIn |
M. J. A. Bolzan, R. R. Rosa, Y. Sahai |
| 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 ; 27, no. 2 ; Nr. 27, no. 2 (2009-02-05), S.569-576 |
| Datensatznummer |
250016396
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| Publikation (Nr.) |
 copernicus.org/angeo-27-569-2009.pdf |
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| Zusammenfassung |
| The technique of large deviation multifractal spectrum has shown that the
high-latitude (77.5° N, 69.2° W) geomagnetic fluctuations can be
described from direct dissipation process or loading-unloading regimes of
the solar wind-magnetosphere coupling. In this paper, we analyze the
H-component of low-latitude (22.4° S, 43.6° W) geomagnetic field
variability observed during the month of July 2000 at the Geomagnetic
Observatory, Vassouras, RJ, Brazil. The variability pattern during this
period is a mixture of quiet and disturbed days including the Bastille Day
intense geomagnetic storm on 15 July. Due to the complexity of this data, we
pursue a detailed analysis of the geomagnetic fluctuations in different time
scales including a multifractal approach using the singular power spectrum
deviations obtained from the wavelet transform modulus maxima (WTMM). The
results suggest, as observed from high-latitude data, the occurrence of
low-latitude multifractal processes driving the intermittent coupling
between the solar wind-magnetosphere and geomagnetic field variations. On
finer scales possible physical mechanisms in the context of nonlinear
magnetosphere response are discussed. |
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