They are two closely connected science questions about how the solar wind is heated and how the turbulence is dissipated. The research breakthrough is blocked by the difficulty of combining the wave diagnosis and particle kinetics analysis together. We provided the simultaneous information of wave features and particle kinetics. We confirmed again the two components of waves at ion kinetic scales, quasi-parallel ion cyclotron waves and quasi-perpendicular kinetic Alfven waves. We identified the evidence of multiple resonance plateaus: left-cyclotron resonance between ion cyclotron waves and proton core components, right-cyclotron resonance and Landau resonance between kinetic Alfven waves and proton beam components. Hence, a scenario of solar wind proton joint heating perpendicularly and parallely by the two-component kinetic waves is suggested.
This work is published on Astrophys. J. Lett. (ApJL)上 (He, J.-S., et al., ApJL, 800, L31, 2015)。
Authors: Jiansen HE, Linghua WANG, Chuanyi TU, Eckart MARSCH, Qiugang ZONG
This work is supported by NSFC innovation group program, key program, excellent scholarship program, and general program.
The group of Solar and Heliospheric Physics has published a research paper on Ann. Geophys., focusing on how to identify slow magnetosonic waves in MHD turbulence. A new criteria is proposed in this paper. The advantage of this criteria lies in its insensitiveness to the propagation angle, which is not easy to estimate in the 3D simulation data. Therefore, the method of this work can be applied to the identification and statistical analysis of the compressive waves in 3D turbulence. The authors also qualitatively describe the physical feature and temporal evolution of four events of slow mode waves as identified.
Gyro-averaged equations of particle motion for resonances with oblique whistler-mode waves were previously derived by multiple authors with inconsistent formulas. This study suggests a check on self-consistency: the energy variation resulting from momentum equations should not contain any wave magnetic components. We also show that the wave centripetal force, which was neglected in previous studies, can significantly enhance electron phase trapping. This force can also bounce low pitch angle particles out of the loss cone. 