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The source of the intermediate wavelength component of the earth's magnetic field
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Harrison, C. G. A. |
| Copyright Year | 1985 |
| Description | The intermediate wavelength component of the Earth's magnetic field has been well documented by observations made by MAGSAT. It has been shown that some significant fraction of this component is likely to be caused within the core of the Earth. Evidence for this comes from analysis of the intermediate wavelength component revealed by spherical harmonics between degrees 14 and 23, in which it is shown that it is unlikely that all of this signal is crustal. Firstly, there is no difference between average continental source strength and average oceanic source strength, which is unlikely to be the case if the anomalies reside within the crust, taking into account the very different nature and thickness of continental and oceanic crust. Secondly, there is almost no latitudinal variation in the source strength, which is puzzling if the sources are within the crust and have been formed by present or past magnetic fields with a factor of two difference in intensity between the equator and the poles. If however most of the sources for this field reside within the core, then these observations are not very surprising. |
| File Size | 98924 |
| Page Count | 2 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19860003423 |
| Archival Resource Key | ark:/13960/t9r25tm0p |
| Language | English |
| Publisher Date | 1985-10-01 |
| Access Restriction | Open |
| Subject Keyword | Geophysics Field Strength Geomagnetism Correlation Spherical Harmonics Earth Core Satellite Observation Models Magsat Satellites Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
