Solar Wind Thermally Induced Magnetic Fluctuations

Artículo de publicación ISIA kinetic description of Alfvén-cyclotron magnetic fluctuations for anisotropic electron-proton quasistable plasmas is studied. An analytical treatment, based on the fluctuation-dissipation theorem, consistently shows that spontaneous fluctuations in plasmas with stable distributions significantly contribute to the observed magnetic fluctuations in the solar wind, as seen, for example, in [S. D. Bale et al., Phys. Rev. Lett. 103, 211101 (2009)], even far below from the instability thresholds. Furthermore, these results, which do not require any adjustable parameters or wave excitations, are consistent with the results provided by hybrid simulations. It is expected that this analysis contributes to our understanding of the nature of magnetic fluctuations in the solar wind.This project has beenfinancially supported byFONDECyT under Contracts No. 1110135 (J. A. V.), No. 1110729 (J. A. V.), No. 1121144 (V.M.), and No. 1110880 (J. A). P. S.M. received support froma CONICYT-Becas Chile Postdoctoral Fellowship. R. N. received support from a CONICyT Fellowship No. 21100691. J. A. V. also thanks to CEDENNA and A. F. V. thanks to NASA’s Wind/SWE program for their support