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Five-Minute Solar Oscillations and Ion-Cyclotron Waves in the Solar Wind

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Abstract

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. This modulation is expected mainly from variations in the orientation of the interplanetary magnetic field lines, which, in turn, are caused by the Alfvén waves propagating from the Sun. To test the theoretical predictions, we analyzed records of the ultra-low-frequency (ULF) geoelectromagnetic waves to find the permanent quasi-monochromatic oscillations of natural origin in the Pc1 – 2 frequency band (0.1 – 5 Hz), the carrier frequency of which varies with time in a wide range. As a result, we found the so-called serpentine emission (SE), which was observed in Antarctica at the Vostok station near the South Geomagnetic Pole. The permanency, range of frequencies, and the deep frequency modulation of the SE correspond to the qualitative properties of ion-cyclotron waves in the solar wind. In the context of this work, one of the most important features of the SE is a clearly expressed five-minute modulation of the carrier frequency. We assume that we have found non-trivial manifestations of the solar five-minute oscillations on the Earth.

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Acknowledgements

We thank the referee for their helpful comments and suggestions. The work was supported by the Russian Foundation for Basic Research (projects 13-05-00066 and 13-05-00529).

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Correspondence to A. Potapov.

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Guglielmi, A., Potapov, A. & Dovbnya, B. Five-Minute Solar Oscillations and Ion-Cyclotron Waves in the Solar Wind. Sol Phys 290, 3023–3032 (2015). https://doi.org/10.1007/s11207-015-0772-2

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  • DOI: https://doi.org/10.1007/s11207-015-0772-2

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