PSP Bibliography


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Tracking solar wind flows from rapidly varying viewpoints by the Wide-field Imager for Parker Solar Probe

AuthorNindos, A.; Patsourakos, S.; Vourlidas, A.; Liewer, P.C.; Penteado, P.; Hall, J.R.;
KeywordsParker Data Used; parker solar probe; Solar Probe Plus
Abstract\ Aims: Our goal is to develop methodologies to seamlessly track transient solar wind flows viewed by coronagraphs or heliospheric imagers from rapidly varying viewpoints. \ Methods: We constructed maps of intensity versus time and elongation (J-maps) from Parker Solar Probe (PSP) Wide- field Imager (WISPR) observations during the fourth encounter of PSP. From the J-map, we built an intensity on impact-radius-on- Thomson-surface map (R-map). Finally, we constructed a latitudinal intensity versus time map (Lat-map). Our methodology satisfactorily addresses the challenges associated with the construction of such maps from data taken from rapidly varying viewpoint observations. \ Results: Our WISPR J-map exhibits several tracks, corresponding to transient solar wind flows ranging from a coronal mass ejection down to streamer blobs. The latter occurrence rate is about 4-5 per day, which is similar to the occurrence rate in a J-map made from \raisebox-0.5ex\textasciitilde1 AU data obtained with the Heliospheric Imager-1 (HI-1) on board the Solar Terrestrial Relations Observatory Ahead spacecraft (STEREO-A). STEREO-A was radially aligned with PSP during the study period. The WISPR J-map tracks correspond to angular speeds of 2.28 \ensuremath\pm 0.7\textdegree/h (2.49 \ensuremath\pm 0.95\textdegree/h), for linear (quadratic) time-elongation fittings, and radial speeds of about 150-300 km s$^\ensuremath-1$. The analysis of the Lat-map reveals a bifurcating streamer, which implies that PSP was flying through a slightly folded streamer during perihelion. \ Conclusions: We developed a framework to systematically capture and characterize transient solar wind flows from space platforms with rapidly varying vantage points. The methodology can be applied to PSP WISPR observations as well as to upcoming observations from instruments on board the Solar Orbiter mission. \\Movie associated to Fig. 8 is available at
Year of Publication2020
JournalAstronomy and Astrophysics
Number of PagesA30
Date Publishedjun