Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/3944
Authors: | De Santis, A.* Barraclough, D. R.* Tozzi, R.* |
Title: | Spatial and temporal spectra of the geomagnetic field and their scaling properties | Journal: | Physics of the Earth and Planetary Interiors | Series/Report no.: | 2-3 / 135 (2003) | Publisher: | Elsevier | Issue Date: | 25-Feb-2003 | DOI: | 10.1016/S0031-9201(02)00211-X | Keywords: | Geomagnetic field spectra Secular variation Persistence times |
Subject Classification: | 04. Solid Earth::04.05. Geomagnetism::04.05.05. Main geomagnetic field | Abstract: | Many natural phenomena show a relationship between their spatial and temporal Fourier spectra. This paper discusses such a connection for the geomagnetic field, when some assumptions are made about the (exponential or power-law) behaviour of the spatial power spectrum of the field itself and that of its time derivative (the spatial spectrum of the secular variation) as estimated from global geomagnetic field models. It is shown that, under either assumption, the temporal spectrum of the geomagnetic field computed at the core–mantle boundary (CMB) would have a power-law behaviour with a negative spectral exponent of about 0.5. At the Earth’s surface, although the temporal spectrum obtained from the power-law spatial model assumes a slightly more complicated form, it can be practically approximated with a power law with a negative exponent of about 3.6. Analysis of magnetic observatory data confirms these results and that the starting hypotheses are reasonable, especially in view of the possibly chaotic state of the dynamical processes underlying the generation and maintenance of the geomagnetic field. |
Appears in Collections: | Article published / in press |
Files in This Item:
File | Description | Size | Format | Existing users please Login |
---|---|---|---|---|
08060814533509924.pdf | 240.44 kB | Adobe PDF |
WEB OF SCIENCETM
Citations
24
checked on Feb 7, 2021
Page view(s) 50
162
checked on Apr 20, 2024
Download(s)
27
checked on Apr 20, 2024