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Authors: Zhu Xingyu, He Jiansen, Verscharen Daniel, Duan Die, and Bale Stuart D.
Title: Wave Composition, Propagation, and Polarization of Magnetohydrodynamic Turbulence within 0.3 au as Observed by Parker Solar Probe

Turbulence, a ubiquitous phenomenon in interplanetary space, is crucial for the energy conversion of space plasma at multiple scales. This work focuses on the propagation, polarization, and wave composition properties of the solar wind turbulence within 0.3 au, and its variation with heliocentric distance at magnetohydrodynamic scales (from 10 s to 1000 s in the spacecraft frame). We present the probability density function of propagation wavevectors (PDF (k(parallel to),k)) for solar wind turbulence within 0.3 au for the first time: (1) wavevectors cluster quasi-(anti-)parallel to the local background magnetic field forkd(i) < 0.02, whered(i)is the ion inertial length; (2) wavevectors shift to quasi-perpendicular directions forkd(i) > 0.02. Based on our wave c. . .
Date: 09/2020 Publisher: The Astrophysical Journal Pages: L3 DOI: 10.3847/2041-8213/abb23e Available at:
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Authors: Morgan Huw, and Cook Anthony C.
Title: The Width, Density, and Outflow of Solar Coronal Streamers

Characterizing the large-scale structure and plasma properties of the inner corona is crucial to understanding the source and subsequent expansion of the solar wind and related space weather effects. Here, we apply a new coronal rotational tomography method, along with a method to narrow streamers and refine the density estimate, to COR2A/Solar Terrestrial Relations Observatory observations from a period near solar minimum and maximum, gaining density maps for heights between 4 and 8R. The coronal structure is highly radial at these heights, and the streamers are very narrow: in some regions, only a few degrees in width. The mean densities of streamers is almost identical between solar minimum and maximum. However, streamers at solar maximum contain around 50% more total m. . .
Date: 04/2020 Publisher: The Astrophysical Journal Pages: 57 DOI: 10.3847/1538-4357/ab7e32 Available at:
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Authors: Hess Phillip, Rouillard Alexis P., Kouloumvakos Athanasios, Liewer Paulett C., Zhang Jie, et al.
Title: WISPR Imaging of a Pristine CME

The Wide-field Imager for Solar Probe (WISPR) on board the Parker Solar Probe (PSP) observed a coronal mass ejection (CME) on 2018 November 1, the first day of the initial PSP encounter. The speed of the CME, approximately 200-300 km s-1 in the WISPR field of view, is typical of slow, streamer blowout CMEs. This event was also observed by the Large Angle and Spectrometric Coronagraph Experiment (LASCO) coronagraphs. WISPR and LASCO view remarkably similar structures that enable useful cross-comparison between the two data sets as well as stereoscopic imaging of the CME. An analysis is extended to lower heights by linking the white-light observations to extreme ultraviolet (EUV) data from the Atmospheric Imaging Assembly, which reveal a structure that erupts more than a full d. . .
Date: 02/2020 Publisher: The Astrophysical Journal Supplement Series Pages: 25 DOI: 10.3847/1538-4365/ab4ff0 Available at:
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Authors: Vourlidas Angelos, Howard Russell A., Plunkett Simon P., Korendyke Clarence M., Thernisien Arnaud F. R., et al.
Title: The Wide-Field Imager for Solar Probe Plus (WISPR)
Abstract: N/A
Date: 02/2015 Publisher: Space Science Reviews Pages: 83 - 130 DOI: 10.1007/s11214-014-0114-y Available at:
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