@article{ZhuShpritsSpasojevicetal.2019,
  author    = {Zhu, Hui and Shprits, Yuri Y. and Spasojevic, M. and Drozdov, Alexander},
  title     = {New hiss and chorus waves diffusion coefficient parameterizations from the Van Allen Probes and their effect on long-term relativistic electron radiation-belt VERB simulations},
  series = {Journal of Atmospheric and Solar-Terrestrial Physics},
  volume    = {193},
  journal   = {Journal of Atmospheric and Solar-Terrestrial Physics},
  publisher = {Elsevier},
  address   = {Oxford},
  issn      = {1364-6826},
  doi       = {10.1016/j.jastp.2019.105090},
  pages     = {13},
  year      = {2019},
  abstract  = {New wave frequency and amplitude models for the nightside and dayside chorus waves are built based on measurements from the Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) instrument onboard the Van Allen Probes. The corresponding 3D diffusion coefficients are systematically obtained. Compared with previous commonly-used (typical) parameterizations, the new parameterizations result in differences in diffusion rates that depend on the energy and pitch angle. Furthermore, one-year 3D diffusive simulations are performed using the Versatile Electron Radiation Belt (VERB) code. Both typical and new wave parameterizations simulation results are in a good agreement with observations at 0.9 MeV. However, the new parameterizations for nightside chorus better reproduce the observed electron fluxes. These parameterizations will be incorporated into future modeling efforts.},
  language  = {en}
}
@article{DrozdovShpritsUsanovaetal.2017,
  author    = {Drozdov, Alexander and Shprits, Yuri Y. and Usanova, Maria E. and Aseev, Nikita and Kellerman, Adam C. and Zhu, H.},
  title     = {EMIC wave parameterization in the long-term VERB code simulation},
  series = {Journal of geophysical research : Space physics},
  volume    = {122},
  journal   = {Journal of geophysical research : Space physics},
  publisher = {American Geophysical Union},
  address   = {Washington},
  issn      = {2169-9380},
  doi       = {10.1002/2017JA024389},
  pages     = {8488 -- 8501},
  year      = {2017},
  abstract  = {Electromagnetic ion cyclotron (EMIC) waves play an important role in the dynamics of ultrarelativistic electron population in the radiation belts. However, as EMIC waves are very sporadic, developing a parameterization of such wave properties is a challenging task. Currently, there are no dynamic, activity-dependent models of EMIC waves that can be used in the long-term (several months) simulations, which makes the quantitative modeling of the radiation belt dynamics incomplete. In this study, we investigate Kp, Dst, and AE indices, solar wind speed, and dynamic pressure as possible parameters of EMIC wave presence. The EMIC waves are included in the long-term simulations (1year, including different geomagnetic activity) performed with the Versatile Electron Radiation Belt code, and we compare results of the simulation with the Van Allen Probes observations. The comparison shows that modeling with EMIC waves, parameterized by solar wind dynamic pressure, provides a better agreement with the observations among considered parameterizations. The simulation with EMIC waves improves the dynamics of ultrarelativistic fluxes and reproduces the formation of the local minimum in the phase space density profiles.},
  language  = {en}
}