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In situ observations of large-amplitude Alfvén waves heating and accelerating the solar wind

Journal
Date Issued
2024
Author(s)
Rivera, Yeimy J.
•
Badman, Samuel T.
•
Stevens, Michael L.
•
Verniero, Jaye L.
•
Stawarz, Julia E.
•
Shi, Chen
•
Raines, Jim M.
•
Paulson, Kristoff W.
•
Owen, Christopher J.
•
Niembro, Tatiana
•
Louarn, Philippe
•
Livi, Stefano A.
•
Lepri, Susan T.
•
Kasper, Justin C.
•
Horbury, Timothy S.
•
Halekas, Jasper S.
•
Dewey, Ryan M.
•
•
Bale, Stuart D.
DOI
Abstract
After leaving the Sun's corona, the solar wind continues to accelerate and cools, but more slowly than expected for a freely expanding adiabatic gas. Alfvén waves are perturbations of the interplanetary magnetic field that transport energy. We use in situ measurements from the Parker Solar Probe and Solar Orbiter spacecraft to investigate a stream of solar wind as it traverses the inner heliosphere. The observations show heating and acceleration of the plasma between the outer edge of the corona and near the orbit of Venus, along with the presence of large-amplitude Alfvén waves. We calculate that the damping and mechanical work performed by the Alfvén waves are sufficient to power the heating and acceleration of the fast solar wind in the inner heliosphere.
Volume
385
Issue
6712
Start page
962
Uri
Url
Issn Identifier
0036-8075
Rights
open.access
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