 |
| Titel |
Complexity signatures in the geomagnetic H component recorded by the Tromsø magnetometer (70° N, 19° E) over the last quarter of a century |
| VerfasserIn |
C. M. Hall |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1023-5809
|
| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 21, no. 5 ; Nr. 21, no. 5 (2014-10-22), S.1051-1058 |
| Datensatznummer |
250120947
|
| Publikation (Nr.) |
 copernicus.org/npg-21-1051-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| Solar disturbances, depending on the orientation of the interplanetary
magnetic field, typically result in perturbations of the geomagnetic field as
observed by magnetometers on the ground. Here, the geomagnetic field's
horizontal component, as measured by the ground-based observatory-standard
magnetometer at Tromsø (70° N, 19° E), is examined for
signatures of complexity. Twenty-five year-long 10 s resolution data sets
are analysed for fluctuations with timescales of less than 1 day.
Quantile–quantile plots are employed first, revealing that the fluctuations
are better represented by Cauchy rather than Gaussian distributions.
Thereafter, both spectral density and detrended fluctuation analysis methods
are used to estimate values of the generalized Hurst exponent, α. The
results are then compared with independent findings. Inspection and
comparison of the spectral and detrended fluctuation analyses reveal that
timescales between 1 h and 1 day are characterized by
fractional Brownian motion with a generalized Hurst exponent of ~1.4,
whereas including timescales as short as 1 min suggests fractional
Brownian motion with a generalized Hurst exponent of ~1.6. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|