| Abstract: | We developed an updated model of the secular variation of the main geomagnetic field during 1980 through 1983 based on annual mean values for that interval from 148 worldwide magnetic observatories. The model consists of a series of 80 spherical harmonics, up to and including those of degree and order 8. We used it to form a proposal for the 1985 revision of the International Geomagnetic Reference Field (IGRF). Comparison of the new model, whose mean epoch is approximately 1982.0, with the Provisional Geomagnetic Reference Field for 1975-1980 (PGRF 1975), indicates that the moment of the centered-dipole part of the geomagnetic field is now decreasing faster than it was 5 years ago. The rate (in field units) indicated by PGRF 1975 was about -25 nT a-1, while for the new model it is -28 nT a-1. ?? 1987. |
| Genre: | Article |
| ProdID: | 70014179 |
| Citation Author: | Peddie, N. W.; Zunde, A. K. |
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| Citation End Page: | 329 |
| Citation Issue: | 3-4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Physics of the Earth and Planetary Interiors |
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| Citation Number Of Pages: | 6 |
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| Citation Publisher: | Elsevier |
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| Citation Search Results Text: | A model of geomagnetic secular variation for 1980-1983; 1987; Article; Journal; Physics of the Earth and Planetary Interiors; Peddie, N. W.; Zunde, A. K. |
| Citation Start Page: | 324 |
| Citation Volume: | 48 |
| Citation Year: | 1987 |
| Type: | citation/reference |
| Text: | A model of geomagnetic secular variation for 1980-1983; 1987; Article; Journal; Physics of the Earth and Planetary Interiors; Peddie, N. W.; Zunde, A. K. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/0031-9201(87)90155-5 |
| Date Other: | Thu, 1 Jan 1987 00:00 -0600 |
| Publisher: | Elsevier |
