A Predictive Geomagnetic Field Model for Epoch 1990.5
Abstract
A predictive model of the geomagnetic field for epoch 1990.5 has been developed. The model is based on the DGRF model for 1980.5 updated to 1990.5 by use of a secular variation model for 1980.0 developed at (NOARL). The NOARL secular variation model is based upon annual means of vector geomagnetic field components from 73 magnetic observatories for years 1976.5 through 1983.5. The predictive model is of degree and order 10. The rms error of the predictive models is estimated to be 200 nT relative to an accurate degree 10 field for epoch 1990.5. Peak errors relative to an accurate model are estimated to be 500 nT for vector field error magnitude and + or - 350, + or - 250, and + or - 500 nT for north, east, and vertical field components errors, respectively. If the DGRF model for 1980.5 were used without updating representing the degree 10 field for 1990.5, estimated errors would be about four times as large. Keywords: Geomagnetism; Test methods; Mathematical prediction/models.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1990
- Accession Number
- ADA226491
Entities
People
- M. G. Mcleod
Organizations
- United States Naval Research Laboratory