Simultaneous magnetic field variations at the earth's surface and at synchronous, equatorial distance. Part II. Magnetic storms

1. Introduction In this paper we report initial results of a study of magnetic activity at 6.6 RE (1 RE = radius of earth) during geomagnetic storms. The magnetic field measurements at 6.6 RE were obtained with a magnetometer on board the synchronous, equatorial earth satellite, ATS–1, which was launched on 6 December 1966. The spacecraft and magnetometer are described briefly in Part 1 (Cummings and Coleman, 1968).