Relating Intermittency and Inverse Cascade to Stochastic Entropy in Solar Wind Turbulence
Turbulent energy transfer in nearly collisionless plasmas can be conceptualized as a scale-to-scale Langevin process. Hence, the statistics of magnetic field fluctuations can be embedded in the framework of stochastic process theory. In this work, we investigate the statistical properties of the pri...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal Letters |
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| Online Access: | https://doi.org/10.3847/2041-8213/ad1192 |
| _version_ | 1797387121560911872 |
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| author | Mirko Stumpo Simone Benella Tommaso Alberti Oreste Pezzi Emanuele Papini Giuseppe Consolini |
| author_facet | Mirko Stumpo Simone Benella Tommaso Alberti Oreste Pezzi Emanuele Papini Giuseppe Consolini |
| author_sort | Mirko Stumpo |
| collection | DOAJ |
| description | Turbulent energy transfer in nearly collisionless plasmas can be conceptualized as a scale-to-scale Langevin process. Hence, the statistics of magnetic field fluctuations can be embedded in the framework of stochastic process theory. In this work, we investigate the statistical properties of the pristine solar wind as observed by Parker Solar Probe by defining the cascade trajectories of magnetic field increments and by estimating the stochastic entropy variation along them. Through the stochastic entropy, we can identify two regimes where fluctuations exhibit contrasting statistical properties. In the inertial range, the entropy production is associated with an increase of the flatness indicating the occurrence of intermittency. Otherwise, trajectories associated with an entropy consumption exhibit global scale invariance. In the transition region toward ion scales, the phenomenology switches: entropy-consuming trajectories exhibit a sudden flatness increase, associated with the presence of small-scale intermittency, while entropy-producing trajectories display a nearly constant flatness. Results are interpreted in terms of physical processes consistent with an accumulation of energy at ion scales. |
| first_indexed | 2024-03-08T22:20:18Z |
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| id | doaj.art-6ad9fb24112c4c1fa99dab0f9cdc94e4 |
| institution | Directory Open Access Journal |
| issn | 2041-8205 |
| language | English |
| last_indexed | 2024-03-08T22:20:18Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal Letters |
| spelling | doaj.art-6ad9fb24112c4c1fa99dab0f9cdc94e42023-12-18T13:55:47ZengIOP PublishingThe Astrophysical Journal Letters2041-82052023-01-019592L2010.3847/2041-8213/ad1192Relating Intermittency and Inverse Cascade to Stochastic Entropy in Solar Wind TurbulenceMirko Stumpo0https://orcid.org/0000-0002-6303-5329Simone Benella1https://orcid.org/0000-0002-7102-5032Tommaso Alberti2https://orcid.org/0000-0001-6096-0220Oreste Pezzi3https://orcid.org/0000-0002-7638-1706Emanuele Papini4https://orcid.org/0000-0002-7969-7415Giuseppe Consolini5https://orcid.org/0000-0002-3403-647XINAF-Istituto di Astrofisica e Planetologia Spaziali , I-00133 Roma, Italy ; mirko.stumpo@inaf.itINAF-Istituto di Astrofisica e Planetologia Spaziali , I-00133 Roma, Italy ; mirko.stumpo@inaf.itIstituto Nazionale di Geofisica e Vulcanologia , Via di Vigna Murata, 605, I-00143, Rome, ItalyINAF-Istituto di Astrofisica e Planetologia Spaziali , I-00133 Roma, Italy ; mirko.stumpo@inaf.it; Istituto per la Scienza e Tecnologia dei Plasmi , Consiglio Nazionale delle Ricerche, Via Amendola 122/D, I-70126 Bari, ItalyINAF-Istituto di Astrofisica e Planetologia Spaziali , I-00133 Roma, Italy ; mirko.stumpo@inaf.itINAF-Istituto di Astrofisica e Planetologia Spaziali , I-00133 Roma, Italy ; mirko.stumpo@inaf.itTurbulent energy transfer in nearly collisionless plasmas can be conceptualized as a scale-to-scale Langevin process. Hence, the statistics of magnetic field fluctuations can be embedded in the framework of stochastic process theory. In this work, we investigate the statistical properties of the pristine solar wind as observed by Parker Solar Probe by defining the cascade trajectories of magnetic field increments and by estimating the stochastic entropy variation along them. Through the stochastic entropy, we can identify two regimes where fluctuations exhibit contrasting statistical properties. In the inertial range, the entropy production is associated with an increase of the flatness indicating the occurrence of intermittency. Otherwise, trajectories associated with an entropy consumption exhibit global scale invariance. In the transition region toward ion scales, the phenomenology switches: entropy-consuming trajectories exhibit a sudden flatness increase, associated with the presence of small-scale intermittency, while entropy-producing trajectories display a nearly constant flatness. Results are interpreted in terms of physical processes consistent with an accumulation of energy at ion scales.https://doi.org/10.3847/2041-8213/ad1192Solar windSpace plasmasInterplanetary turbulenceInterplanetary physics |
| spellingShingle | Mirko Stumpo Simone Benella Tommaso Alberti Oreste Pezzi Emanuele Papini Giuseppe Consolini Relating Intermittency and Inverse Cascade to Stochastic Entropy in Solar Wind Turbulence The Astrophysical Journal Letters Solar wind Space plasmas Interplanetary turbulence Interplanetary physics |
| title | Relating Intermittency and Inverse Cascade to Stochastic Entropy in Solar Wind Turbulence |
| title_full | Relating Intermittency and Inverse Cascade to Stochastic Entropy in Solar Wind Turbulence |
| title_fullStr | Relating Intermittency and Inverse Cascade to Stochastic Entropy in Solar Wind Turbulence |
| title_full_unstemmed | Relating Intermittency and Inverse Cascade to Stochastic Entropy in Solar Wind Turbulence |
| title_short | Relating Intermittency and Inverse Cascade to Stochastic Entropy in Solar Wind Turbulence |
| title_sort | relating intermittency and inverse cascade to stochastic entropy in solar wind turbulence |
| topic | Solar wind Space plasmas Interplanetary turbulence Interplanetary physics |
| url | https://doi.org/10.3847/2041-8213/ad1192 |
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