@article{VafinRiazantsevaYoon2017,
  author    = {Vafin, Sergei and Riazantseva, M. and Yoon, P. H.},
  title     = {Kinetic Features in the Ion Flux Spectrum},
  series = {The astrophysical journal : an international review of spectroscopy and astronomical physics},
  volume    = {850},
  journal   = {The astrophysical journal : an international review of spectroscopy and astronomical physics},
  publisher = {IOP Publ. Ltd.},
  address   = {Bristol},
  issn      = {0004-637X},
  doi       = {10.3847/1538-4357/aa9519},
  pages     = {7},
  year      = {2017},
  abstract  = {An interesting feature of solar wind fluctuations is the occasional presence of a well-pronounced peak near the spectral knee. These peaks are well investigated in the context of magnetic field fluctuations in the magnetosheath and they are typically related to kinetic plasma instabilities. Recently, similar peaks were observed in the spectrum of ion flux fluctuations of the solar wind and magnetosheath. In this paper, we propose a simple analytical model to describe such peaks in the ion flux spectrum based on the linear theory of plasma fluctuations. We compare our predictions with a sample observation in the solar wind. For the given observation, the peak requires similar to 10 minutes to grow up to the observed level that agrees with the quasi-linear relaxation time. Moreover, our model well reproduces the form of the measured peak in the ion flux spectrum. The observed lifetime of the peak is about 50 minutes, which is relatively close to the nonlinear Landau damping time of 30-40 minutes. Overall, our model proposes a plausible scenario explaining the observation.},
  language  = {en}
}
@article{YoonLopezVafinetal.2017,
  author    = {Yoon, P. H. and Lopez, R. A. and Vafin, Sergei and Kim, S. and Schlickeiser, R.},
  title     = {Spontaneous emission of Alfvenic fluctuations},
  series = {Plasma physics and controlled fusion},
  volume    = {59},
  journal   = {Plasma physics and controlled fusion},
  publisher = {IOP Publ. Ltd.},
  address   = {Bristol},
  issn      = {0741-3335},
  doi       = {10.1088/1361-6587/aa77c3},
  pages     = {8},
  year      = {2017},
  abstract  = {Low-frequency fluctuations are pervasively observed in the solar wind. The present paper theoretically calculates the steady state spectra of low-frequency electromagnetic (EM) fluctuations of the Alfvenic type for thermal equilibrium plasma. The analysis is based upon a recently formulated theory of spontaneously emitted EM fluctuations in magnetized thermal plasmas. It is found that the fluctuations in the magnetosonic mode branch is constant, while the kinetic Alfvenic mode spectrum is dependent on a form factor that is a function of perpendicular wave number. Potential applicability of the present work in the wider context of heliospheric research is also discussed.},
  language  = {en}
}