 |
| Titel |
Variability of magnetic field spectra in the Earth's magnetotail |
| VerfasserIn |
A. A. Petrukovich, D. V. Malakhov |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1023-5809
|
| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 16, no. 6 ; Nr. 16, no. 6 (2009-12-15), S.691-698 |
| Datensatznummer |
250013311
|
| Publikation (Nr.) |
 copernicus.org/npg-16-691-2009.pdf |
|
|
|
|
|
| Zusammenfassung |
| We investigate the variability of magnetic fluctuation spectra below 1 Hz in
the Earth's plasma sheet using specially selected long observation intervals
by Geotail spacecraft. The spectra can be generally described by a negative
power law with two kinks. The range between kinks ~0.02–0.2 Hz has the
most stable power law index ~2.4–2.6. Indices at the lower and the
higher frequencies are more variable and generally increase with power of
fluctuations. In the sub-second range fluctuations are strongly localized and
indices are closer to 3. At the lower-frequency end indices are about 1.5.
The lower kink is usually well defined on average spectra and its frequency
tends to increase with activity. Combination of spectrum index α and
fractal dimension δ is expected to follow the Berry relation
α+2δ=5, but actually is ~5.5. |
| |
|
| Teil von |
|
|
|
|
|
|
|