Contrasting Scaling Properties of Near-Sun Sub-Alfvénic and Super-Alfvénic Regions
Abstract
:1. Introduction
2. Data
3. Methods
4. Results
- 1.
- It provides an accurate determination of scaling exponents;
- 2.
- It holds down to the dissipative regime;
- 3.
- It holds for both high and mid-to-low Reynolds numbers.
- If , then the two intervals are characterized by the same fractal topology, i.e., they share the same geometrical structures and the same symmetries;
- If , then the two intervals are characterized by a fractal topology belonging to the same class, i.e., they share the same geometrical structures but with different symmetries;
- If , then the two intervals are characterized by a different fractal topology, i.e., they do not share neither the same geometrical structures nor the same symmetries.
5. Discussions and Conclusions
- 1.
- An extended self-similarity is observed for both the MHD/inertial and the sub-ion/kinetic regimes during both intervals;
- 2.
- A multifractal nature of field fluctuations is reported across inertial scales for both solar wind intervals;
- 3.
- A mono-fractal character is observed for field fluctuations at small scales during both solar wind intervals.
5.1. Extended Self-Similarity
5.2. Multifractality of Inertial Range
5.3. Mono-Fractality at Sub-Ion/Kinetic Scales
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
Abbreviations
AU | Astronomical Unit |
ESS | Extended Self-Similarity |
FGM | Flux-Gate Magnetometer |
MHD | Magnetohydrodynamic |
PSD | Power Spectral Density |
PSP | Parker Solar Probe |
RTN | Radial–Tangential–Normal |
SCM | Search Coil Magnetometer |
SL | She–Leveque |
UT | Universal Time |
1 | The RTN is a spacecraft-centered reference system in which the radial (R) direction is identified as the spacecraft-Sun line, the tangential (T) direction is identified as the tangent to the orbit of the spacecraft, and the N direction is obtained as the curl product of R and T, completing a right-handed triad. |
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Sub-Alfvénic | Super-Alfvénic | |||||
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Alberti, T.; Benella, S.; Carbone, V.; Consolini, G.; Quattrociocchi, V.; Stumpo, M. Contrasting Scaling Properties of Near-Sun Sub-Alfvénic and Super-Alfvénic Regions. Universe 2022, 8, 338. https://doi.org/10.3390/universe8070338
Alberti T, Benella S, Carbone V, Consolini G, Quattrociocchi V, Stumpo M. Contrasting Scaling Properties of Near-Sun Sub-Alfvénic and Super-Alfvénic Regions. Universe. 2022; 8(7):338. https://doi.org/10.3390/universe8070338
Chicago/Turabian StyleAlberti, Tommaso, Simone Benella, Vincenzo Carbone, Giuseppe Consolini, Virgilio Quattrociocchi, and Mirko Stumpo. 2022. "Contrasting Scaling Properties of Near-Sun Sub-Alfvénic and Super-Alfvénic Regions" Universe 8, no. 7: 338. https://doi.org/10.3390/universe8070338