Metis Observation of the Onset of Fully Developed Turbulence in the Solar Corona

Abstract This Letter reports the first observation of the onset of fully developed turbulence in the solar corona. Long time series of white-light coronal images, acquired by Metis aboard Solar Orbiter at 2 minutes cadence and spanning about 10 hr, were studied to gain insight into the statistical properties of fluctuations in the density of the coronal plasma in the time domain. From pixel-by-pixel spectral frequency analysis in the whole Metis field of view, the scaling exponents of plasma fluctuations were derived. The results show that, over timescales ranging from 1 to 10 hr and corresponding to the photospheric mesogranulation-driven dynamics, the density spectra become shallower moving away from the Sun, resembling a Kolmogorov-like spectrum at 3 R ⊙ . According to the latest observation and interpretive work, the observed 5/3 scaling law for density fluctuations is indicative of the onset of fully developed turbulence in the corona. Metis observation-based evidence for a Kolmogorov turbulent form of the fluctuating density spectrum casts light on the evolution of 2D turbulence in the early stages of its upward transport from the low corona.

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Publication Details

Journal
The Astrophysical Journal Letters
Published
2024-09-26
DOI
https://doi.org/10.3847/2041-8213/ad5a8c
Citations
10
Primary Topic
Solar and Space Plasma Dynamics
Type
article
Field-Weighted Citation Impact
3.32

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Metis Observation of the Onset of Fully Developed Turbulence in the Solar Corona

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Metis Observation of the Onset of Fully Developed Turbulence in the Solar Corona

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article en
10 citations

Abstract

Abstract This Letter reports the first observation of the onset of fully developed turbulence in the solar corona. Long time series of white-light coronal images, acquired by Metis aboard Solar Orbiter at 2 minutes cadence and spanning about 10 hr, were studied to gain insight into the statistical properties of fluctuations in the density of the coronal plasma in the time domain. From pixel-by-pixel spectral frequency analysis in the whole Metis field of view, the scaling exponents of plasma fluctuations were derived. The results show that, over timescales ranging from 1 to 10 hr and corresponding to the photospheric mesogranulation-driven dynamics, the density spectra become shallower moving away from the Sun, resembling a Kolmogorov-like spectrum at 3 R ⊙ . According to the latest observation and interpretive work, the observed 5/3 scaling law for density fluctuations is indicative of the onset of fully developed turbulence in the corona. Metis observation-based evidence for a Kolmogorov turbulent form of the fluctuating density spectrum casts light on the evolution of 2D turbulence in the early stages of its upward transport from the low corona.

The Astrophysical Journal LettersVol. 973(2)
Laboratoire de Mécanique des Fluides et d'Acoustique (FR)
National Science Foundation, National Aeronautics and Space Administration, Grantová Agentura České Republiky, Agenzia Spaziale Italiana, Vetenskapsrådet, Istituto Nazionale di Astrofisica, Bundesministerium für Wirtschaft und Energie, Uniwersytet Wrocławski, Goddard Space Flight Center, Office of Naval Research, Heliophysics Division, Office of Experimental Program to Stimulate Competitive Research
Openalex Percentile: Top 8%
Solar and Space Plasma Dynamics
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