Kinetic electrostatic waves and their association with current structures in the solar wind

A variety of kinetic waves develop in the solar wind. The relationship between these and larger-scale structures, such as current sheets ongoing turbulence remain a topic investigation. Similarly, instabilities producing ion-acoustic wind remains an open question. goals this paper are to investigate electrostatic Langmuir at 0.5 AU determine whether associated streaming can produce observed waves. currents is investigated statistically. Solar Orbiter's Radio Plasma Waves instrument suite provides high-resolution snapshots fluctuating electric field. Low Frequency Receiver resolves waveforms Time Domain Sampler both Using waveform data we when relation structures wind, estimated from background magnetic frequently Ion-acoustic about 1% time AU. more likely be regions enhanced currents. However, typically do not occur themselves. too small drive instability by relative drift single ion electron populations. When multi-component and/or distributions present may sufficient for instability. Ion beams most plausible source spacecraft potential confirmed reliable probe density comparing peak frequencies with plasma frequency calculated potential.