# PSP Bibliography

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Magnetic and Velocity Fluctuations in the Near-Sun Region from 0.1-0.3 au Observed by Parker Solar Probe

 Author Wu, Honghong; Tu, Chuanyi; Wang, Xin; Yang, Liping; Keywords Parker Data Used; 1873; 830 Abstract The fluctuations observed in the slow solar wind at 1 au by the WIND spacecraft are shown by recent studies to consist of mainly magnetic-field directional turning and magnetic-velocity alignment structure (MVAS). How these structures are created has been a question because the nature of the fluctuations in the near-Sun region remains unknown. Here, we present an analysis of the measurements in the slow solar wind from 0.1-0.3 au by Parker Solar Probe during its first six orbits. We present the distributions in the $C_\mathrmvb^\prime \mbox—\sigma _r$ plane of both the occurrence and average amplitudes of the fluctuations, including the magnetic field, the velocity, and the Elsässer variables, where $C_\mathrmvb^\prime$ is the correlation coefficient between the magnetic and velocity fluctuations multiplied by the opposite sign of the radial component of the mean magnetic field and \ensuremath\sigma $_ r$ is the normalized residual energy. We find that the dominant composition is the outward- propagating Alfv\ enic fluctuations. We find Alfv\ enic fluctuations with $C_\mathrmvb^\prime 0.95$ , in which the amplitudes of z $^+$ reach 60 km s$^-1$ and those of z $^-$ are close to the observational uncertainty. We also find a region with high $C_\mathrmvb^\prime$ and moderate minus \ensuremath\sigma $_ r$ in which the fluctuations are considered MVAS being magnetic dominated with the amplitude of magnetic fluctuations reaching 60 km s$^-1$. We provide empirical relations between the velocity fluctuation amplitude and $C_\mathrmvb^\prime$ . The comparison between these results and those observed at 1 au may provide some clues as to the nature and evolution of the fluctuations. Year of Publication 2021 Journal \apj Volume 922 Number of Pages 92 Section Date Published dec ISBN URL DOI 10.3847/1538-4357/ac3331