The Ørsted Satellite Project

A Danish Microsatellite With a High Scientific Profile

Papers and reports


DETERMINATION OF THE IGRF 2000

 

Olsen, N. (1), T.J. Sabaka (2), and L. Tøffner-Clausen (3)

  1. Danish Space Research Institute, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark. Fax.: +45 35 36 24 75. E-mail: nio@dsri.dk.

  2. Raytheon ITSS, Lanham, MD 20706, USA.

  3. Ørsted Science Data Center, DMI, Lyngbyvej 100, DK-2100 Copenhagen, Denmark.

Abstract. The IGRF 2000 has been estimated from magnetic measurements taken by the Ørsted sattelite in summer 1999. For this purpose, three models have been derived: The first two models were estimated using a few geomagnetic quiet days in May and September 1999, respectively. The third model, called Ørsted(10c/99), was derived from scalar data spanning six months and vector data spanning four months. In order to get a model for epoch 2000.0, the IGRF 95 secular variaion model has been applied to the data. The IGRF 2000 model was taken to be the internal degree/order 10 portion of Ørsted(10c/99). We describe the data selection, model parameterization, parameter estimation and an evaluation of the three models.