Inner-Heliosphere Signatures of Ion-Scale Dissipation and Nonlinear Interaction
Solar and Stellar Astrophysics
2020-07-15 v1 Plasma Physics
Space Physics
Abstract
We perform a statistical study of the turbulent power spectrum at inertial and kinetic scales observed during the first perihelion encounter of Parker Solar Probe. We find that often there is an extremely steep scaling range of the power spectrum just above the ion-kinetic scales, similar to prior observations at 1 AU, with a power-law index of around . Based on our measurements, we demonstrate that either a significant () fraction of the total turbulent energy flux is dissipated in this range of scales, or the characteristic nonlinear interaction time of the turbulence decreases dramatically from the expectation based solely on the dispersive nature of nonlinearly interacting kinetic Alfv\'en waves.
Keywords
Cite
@article{arxiv.2001.05081,
title = {Inner-Heliosphere Signatures of Ion-Scale Dissipation and Nonlinear Interaction},
author = {Trevor A. Bowen and Alfred Mallet and Stuart D. Bale and J. W. Bonnell and Anthony W. Case and Benjamin D. G. Chandran and Alexandros Chasapis and Christopher H. K. Chen and Die Duan and Thierry Dudok de Wit and Keith Goetz and Jasper Halekas and Peter R. Harvey and J. C. Kasper and Kelly E. Korreck and Davin Larson and Roberto Livi and Robert J. MacDowall and David M. Malaspina and Marc Pulupa and Michael Stevens and Phyllis Whittlesey},
journal= {arXiv preprint arXiv:2001.05081},
year = {2020}
}