Resolution No.4 (1971): Analytical centre on secular variation

The IAGA Assembly accepts with gratitude the proposal of IZMIRAN to organise and manage for IAGA an analytical centre on secular variation with the following functions:

  1. Collection of data on secular variations form magnetic observatories and from repeat stations;
  2. Publication of secular variation charts and tables of annual values of magnetic elements from magnetic observatories;
  3. Spherical harmonic analysis of secular variation.

The Statue of this centre must be drafted by IZMIRAN with the help of the chairmen of Commissions I and II.