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| Titel |
Latitudinal variation of stochastic properties of the geomagnetic field |
| VerfasserIn |
J. A. Wanliss, K. Shiokawa, K. Yumoto |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 21, no. 2 ; Nr. 21, no. 2 (2014-03-03), S.347-356 |
| Datensatznummer |
250120896
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| Publikation (Nr.) |
 copernicus.org/npg-21-347-2014.pdf |
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| Zusammenfassung |
| We explore the stochastic fractal qualities of the geomagnetic field from
210 mm ground-based magnetometers during quiet and active magnetospheric
conditions. We search through 10 yr of these data to find events that
qualify as quiet intervals, defined by Kp ≤ 1 for 1440 consecutive
minutes. Similarly, active intervals require Kp ≥ 4 for 1440 consecutive
minutes. The total for quiet intervals is ~ 4.3 x 106 and 2 x 108 min for active data points. With this large number of data we
characterize changes in the nonlinear statistics of the geomagnetic field via
measurements of a fractal scaling. A clear difference in statistical behavior
during quiet and active intervals is implied through analysis of the scaling
exponents; active intervals generally have larger values of scaling
exponents. This suggests that although 210 mm data appear
monofractal on shorter timescales, the scaling changes, with overall
variability are more likely described as a multifractional Brownian motion. We
also find that low latitudes have scaling exponents that are consistently
larger than for high latitudes. |
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