On the Heating of the Slow Solar-Wind by Imbalanced Alfv\'en-Wave Turbulence from 0.06 au to 1 au: Parker Solar Probe and Solar Orbiter observations

Sofiane Bourouaine; Jean C Perez; Benjamin D. G Chandran; Vamsee K Jagarlamudi; Nour E Raouafi; Jasper S Halekas

doi:10.48550/arxiv.2403.17352

$On the Heating of the Slow Solar-Wind by Imbalanced Alfv\'en-Wave Turbulence from 0.06 au to 1 au: Parker Solar Probe and Solar Orbiter observations$

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On the Heating of the Slow Solar-Wind by Imbalanced Alfv\'en-Wave Turbulence from 0.06 au to 1 au: Parker Solar Probe and Solar Orbiter observations

Sofiane Bourouaine, Jean C Perez, Benjamin D. G Chandran, Vamsee K Jagarlamudi, Nour E Raouafi and Jasper S Halekas

03/25/2024

DOI: 10.48550/arxiv.2403.17352

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Preprint (Author's original)This preprint has not been evaluated by subject experts through peer review. Preprints may undergo extensive changes and/or become peer-reviewed journal articles. Open Access

Abstract

In this work we analyze plasma and magnetic field data provided by the Parker Solar Probe (\emph{PSP}) and Solar Orbiter (\emph{SO}) missions to investigate the radial evolution of the heating of Alfv\'enic slow wind (ASW) by imbalanced Alfv\'en-Wave (AW) turbulent fluctuations from 0.06 au to 1 au. in our analysis we focus on slow solar-wind intervals with highly imbalanced and incompressible turbulence (i.e., magnetic compressibility $C_B=\delta B/B\leq 0.25$, plasma compressibility $C_n=\delta n/n\leq 0.25$ and normalized cross-helicity $\sigma_c\geq 0.65$). First, we estimate the AW turbulent dissipation rate from the wave energy equation and find that the radial profile trend is similar to the proton heating rate. Second, we find that the scaling of the empirical AW turbulent dissipation rate $Q_W$ obtained from the wave energy equation matches the scaling from the phenomenological AW turbulent dissipation rate $Q_{\rm CH09}$ (with $Q_{\rm CH09}\simeq 1.55 Q_W$) derived by~\cite{chandran09} based on the model of reflection-driven turbulence. Our results suggest that, as in the fast solar wind, AW turbulence plays a major role in the ion heating that occurs in incompressible slow-wind streams.

Physics - Plasma Physics

Physics - Solar and Stellar Astrophysics

Physics - Space Physics

Details

Title: Subtitle: On the Heating of the Slow Solar-Wind by Imbalanced Alfv\'en-Wave Turbulence from 0.06 au to 1 au: Parker Solar Probe and Solar Orbiter observations
Creators: Sofiane Bourouaine
Jean C Perez
Benjamin D. G Chandran
Vamsee K Jagarlamudi
Nour E Raouafi
Jasper S Halekas
Resource Type: Preprint
DOI: 10.48550/arxiv.2403.17352
Language: English
Date posted: 03/25/2024
Academic Unit: Physics and Astronomy
Record Identifier: 9984577113002771

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