The Canadian Geomagnetic Reference Field (CGRF) is a mathematical model of the geomagnetic field over Canada. It is produced by carrying out a spherical cap harmonic analysis on numerous observations of the magnetic field made on the ground, at sea, in the air, and at satellite altitudes between 1960 and 1999. The latest CGRF is for 2000, but contains time terms that enable it to be used over the time interval 1960 to 2005.

The Magnetic Information Retrieval Program (MIRP) uses the CGRF to calculate values of magnetic declination , or any other component of the magnetic field, over Canada and adjacent areas. Outside the region of Canada, MIRP automatically uses the International Geomagnetic Reference Field (IGRF) to calculate magnetic field values, with somewhat less accuracy.

You can use the following form to calculate declination using MIRP. This service is intended for the occassional user. If you require a large number of values, please contact Larry Newitt to become a registered user. We will also be able to advise you about more efficient methods of obtaining declination information.

For further information about the CGRF, IGRF and MIRP contact: Larry Newitt

Comments: webmaster
2000-03-27 jap