Evolution of Solar Wind Turbulence from 0.1 to 1 au during the First Parker Solar Probe–Solar Orbiter Radial Alignment
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Award ID(s):
Publication Date:
NSF-PAR ID:
10300892
Journal Name:
The Astrophysical Journal Letters
Volume:
912
Issue:
2
Page Range or eLocation-ID:
L21
ISSN:
2041-8205
2. This Letter capitalizes on a unique set of total solar eclipse observations, acquired between 2006 and 2020, in white light, \ion[Fe xi] 789.2 nm (\Tfexi\ = $1.2 \pm 0.1$ MK) and \ion[Fe xiv] 530.3 nm (\Tfexiv\ = $1.8 \pm 0.1$ MK) emission. They are complemented by \insitu\ Fe charge state and proton speed measurements from ACE/SWEPAM-SWICS, to identify the source regions of different solar wind streams. The eclipse observations reveal the ubiquitous presence of open structures throughout the corona, invariably associated with \ion[Fe xi] emission from $\rm Fe^{10+}$, thus revealing a constant electron temperature, \Tc\ = \Tfexi\, in themore »