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In this paper we investigate the impact of permanent oscillations Pc3 on theexcitation of sporadic oscillations Pi2 ( their periods are 10-45 and 40-150 s,respectively ). The hypothesis is formulated that Pc3 oscillations originatingin front of the magnetosphere penetrate into the geomagnetic tail, cause alocal depression in the current in the neutral sheet, and under favorableconditions stimulate a tearing instability. This leads to reconnection ofmagnetic field lines and an explosive release of magnetic energy stored in thetail. As a result, a substorm breaks up, with sporadic pulsations Pi2 as animportant element of this process. It is expected from theoretical estimatesand kinematic considerations that the higher the Pc3 frequency, the earlier thePi2 trains start. We test this prediction using observational data fromsatellite measurements of the interplanetary magnetic field and on-groundmagnetic measurements. The results confirm the theoretical expectation.Additional routes are proposed to theoretically and experimentally test thehypothesis.

On Permanent and Sporadic Oscillations of the Magnetosphere