Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/3976
Authors: | De Santis, A. | Title: | Translated origin spherical cap harmonic analysis | Journal: | Geophysical Journal International | Series/Report no.: | / 106 (1991) | Publisher: | Blackwell Science Ltd | Issue Date: | 1991 | Keywords: | ground and satellite data analysis regional field modelling spherical cap harmonic analysis |
Subject Classification: | 04. Solid Earth::04.05. Geomagnetism::04.05.03. Global and regional models 05. General::05.05. Mathematical geophysics::05.05.99. General or miscellaneous |
Abstract: | The method of spherical cap harmonic analysis (SCHA), due to Haines (1985) is appropriate for regional geomagnetic field modelling as it includes the required potential field constraints and, for a given number of model parameters, describes shorter wavelength features than a global spherical harmonic model. If the origin of the coordinate system is moved from the centre of the Earth towards the surface then the Earth's surface is no longer equidistant from the origin. At the Earth's surface the minimum wavelength described by a SCH model in the new coordinate system is smaller at the centre of the region than at the edge. This method of translated origin spherical cap harmonic analysis (TOSCA) has been applied to regional field modelling for Italy. The method is able to take advantage of the dense distribution of data at the centre of region and the model effectively smooths towards the periphery. The performance of the TOSCA model is discussed in relation to a model derived using conventional SCHA. |
Appears in Collections: | Article published / in press |
Files in This Item:
File | Description | Size | Format | Existing users please Login |
---|---|---|---|---|
tosca_1991.pdf | 298.97 kB | Adobe PDF |
Page view(s) 50
168
checked on Apr 17, 2024
Download(s)
51
checked on Apr 17, 2024