First results from the Parker Solar Probe (PSP) mission have revealed ubiquitous coherent ion-scale waves in the inner heliosphere, which are signatures of kinetic wave-particle interactions and fluid-scale instabilities. However, initial studies of the circularly polarized ion-scale waves observed by PSP have only thoroughly analyzed magnetic field signatures, precluding a determination of solar-wind frame propagation direction and intrinsic wave-polarization. A comprehensive determination of wave-properties requires measurements of both electric and magnetic fields. Here, we use full capabilities of the PSP/FIELDS instrument suite to measure both the electric and magnetic components of circularly polarized waves. Comparing spacecraft frame magnetic field measurements with the Doppler-shifted cold-plasma dispersion relation for parallel transverse waves constrains allowable plasma frame polarizations and wave-vectors. We demonstrate that the Doppler-shifted cold-plasma dispersion has a maximum spacecraft frequency $f_{sc}^{*}$ for which intrinsically right-handed fast-magnetosonic waves (FMWs) propagating sunwards can appear left-handed in the spacecraft frame. Observations of left-handed waves with $|f|>f_{sc}^{*}$ are uniquely explained by intrinsically left-handed, ion-cyclotron, waves (ICWs). We demonstrate that electric field measurements for waves with $|f|>f_{sc}^{*}$ are consistent with ICWs propagating away from the sun, verifying the measured electric field. Applying the verified electric field measurements to the full distribution of waves suggests that, in the solar wind frame, the vast majority of waves propagate away from the sun, indicating that the observed population of coherent ion-scale waves contains both intrinsically left and right hand polarized modes.

中文翻译：

---

向外传播的离子尺度波的电磁特征

帕克太阳探测器 (PSP) 任务的第一个结果揭示了内部日光层中无处不在的相干离子尺度波，这是动态波粒相互作用和流体尺度不稳定性的特征。然而，对 PSP 观测到的圆极化离子尺度波的初步研究仅彻底分析了磁场特征，无法确定太阳风坐标系传播方向和固有波极化。全面确定波特性需要测量电场和磁场。在这里，我们使用 PSP/FIELDS 仪器套件的全部功能来测量圆极化波的电磁分量。将航天器框架磁场测量与平行横波的多普勒频移冷等离子体色散关系进行比较，可以限制允许的等离子体框架极化和波矢量。我们证明了多普勒频移冷等离子体色散具有最大航天器频率 $f_{sc}^{*}$，为此，向日传播的固有右手快磁声波 (FMW) 可以在航天器框架中出现左旋. 用 $|f|>f_{sc}^{*}$ 观察到的左手波是由固有的左手离子回旋波 (ICW) 唯一解释的。我们证明了 $|f|>f_{sc}^{*}$ 波的电场测量与远离太阳传播的 ICW 一致，验证了测量的电场。