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The Radial Distribution of Ion-scale Waves in the Inner Heliosphere


AuthorLiu, Wen; Zhao, Jinsong; Wang, Tieyan; Dong, Xiangcheng; Kasper, Justin; Bale, Stuart; Shi, Chen; Wu, Dejin;
KeywordsParker Data Used; Plasma physics; Space plasmas; Solar wind; 2089; 1544; 1534; Astrophysics - Solar and Stellar Astrophysics; Physics - Plasma Physics; Physics - Space Physics
AbstractDetermining the mechanism responsible for plasma heating and particle acceleration is a fundamental problem in the study of the heliosphere. Due to efficient wave-particle interactions of ion- scale waves with charged particles, these waves are widely believed to be a major contributor to ion energization, and their contribution considerably depends on the wave occurrence rate. By analyzing the radial distribution of quasi- monochromatic ion-scale waves observed by the Parker Solar Probe, this work shows that the wave occurrence rate is significantly enhanced in the near-Sun solar wind, specifically 21\%-29\% below 0.3 au, in comparison to 6\%-14\% beyond 0.3 au. The radial decrease of the wave occurrence rate is not only induced by the sampling effect of a single spacecraft detection, but also by the physics relating to the wave excitation, such as the enhanced ion beam instability in the near-Sun solar wind. This work also shows that the wave normal angle \ensuremath\theta, the absolute value of ellipticity ϵ, the wave frequency f normalized by the proton cyclotron frequency f $_cp$, and the wave amplitude \ensuremath\delta B normalized by the local background magnetic field B $_0$ slightly vary with the radial distance. The median values of \ensuremath\theta, \ensuremath\midϵ\ensuremath\mid, f, and \ensuremath\delta B are about 9\textdegree, 0.73, 3f $_cp$, and 0.01B $_0$, respectively. Furthermore, this study proposes that the wave mode natures of the observed left- handed and right-handed polarized waves correspond to the Alfv\ en ion cyclotron mode wave and the fast magnetosonic whistler mode wave, respectively.
Year of Publication2023
Journal\apj
Volume951
Number of Pages69
Section
Date Publishedjul
ISBN
URL
DOI10.3847/1538-4357/acd53b