Open Access

The irregular variations of the external geomagnetic field from Intermagnet data

  • Eric Bellanger1Email author,
  • Fatma Anad1,
  • Jean-Louis Le Mouël1 and
  • Mioara Mandea1
Earth, Planets and Space201455:BF03351746

Received: 15 April 2002

Accepted: 31 March 2003

Published: 20 June 2014


The Intermagnet program publishes each year a cd-rom containing homogeneous series from a number of magnetic observatories (76 in 1999). These series are definitive one-minute values of the three components of the geomagnetic field. We transform these series using a simple nonlinear analysis tool able to characterize the activity of a signal, and we obtain a remarkably simple activity field, whose space and time variables separate over a large part of the Earth. The time function is almost identical for all observatories, and might be interpreted as an activity index. The—almost stationary—field geometry exhibits a dipole-like structure everywhere except in high latitudes.

Key words

Geomagnetic fieldirregular variationsINTERMAGNETabsolute derivative