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We study the possible impact of the photospheric five-minute oscillations on the ion-cyclotron waves in the solar wind. We proceed from the assumption that the ion-cyclotron waves in the solar wind experience a modulation with a characteristic period of five minutes under the influence of Alfvén waves driven by photospheric motions. The theory presented in this article predicts a deep frequency modulation...
There are a host of factors influencing the excitation of Pc1 geomagnetic pulsations, which are ULF waves in the frequency range between 0.2 and 5Hz. We have studied carefully the dependence of the pearl-type Pc1 activity at Sodankylä, Finland (L=5.1) on the plasma density N in front of the magnetosphere, the bulk velocity V of the solar wind, and the intensity B of the IMF. The result is as follows:...
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