Prospective White-light Imaging and In Situ Measurements of Quiescent Large-scale Solar-wind Streams from the <i>Parker Solar Probe</i> and <i>Solar Orbiter</i>

Author
Keywords
Abstract
<p>Deep-space exploration of the inner heliosphere is in an unprecedented golden age, with the recent and forthcoming launches of the Parker Solar Probe (PSP) and Solar Orbiter (SolO) missions, respectively. In order to both predict and understand the prospective observations by PSP and SolO, we perform forward MHD modeling of the 3D inner heliosphere at solar minimum, and synthesize the white-light (WL) emission that would result from Thomson scattering of sunlight from the coronal and heliospheric plasmas. Both solar rotation and spacecraft trajectory should be considered when reconstructing quiescent large-scale solar-wind streams from PSP and SolO WL observations. When transformed from a static coordinate system into a corotating one, the elliptical orbit of PSP becomes a multiwinding spiral. The innermost spiral winding of this corotating PSP orbit takes the form of a closed \textquotedblleftheart shape\textquotedblright within around 80 R <sub>☉</sub> of the Sun. PSP, when traveling along this \textquotedblleftheart-shaped\textquotedblright trajectory, can cross a single corotating interaction region (CIR) twice. This enables in situ measurements of the same CIR to be made in both the corona and heliosphere. As PSP approaches perihelion, the WL radiance from the corona increases. Polarization can be used to localize the main WL scattering region in the corona. Large-scale structures around PSP can be further resolved in the longitudinal dimension, using additional WL imagery from the out-of-ecliptic perspective of SolO. Coordinated observations between PSP and SolO are very promising in the quest to differentiate background CIRs from transient ejecta.</p>
Year of Publication
2018
Journal
The Astrophysical Journal
Volume
868
Number
Number of Pages
137
Date Published
12/2018
URL
http://stacks.iop.org/0004-637X/868/i=2/a=137?key=crossref.fe473eb9a278d1ea105f9203808e2eab
DOI
10.3847/1538-4357/aae978