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Emergence of Two Inertial Subranges in Solar Wind Turbulence: Dependence on Heliospheric Distance and Solar Activity
Department of Physics and Astronomy, Queen Mary University of London, London E1 4NS, UK; Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India.
Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India.
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Space and Plasma Physics. Institute for Plasma Science and Technology (ISTP), CNR, 70126 Bari, Italy.ORCID iD: 0000-0002-5981-7758
2025 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 982, no 2, article id 199Article in journal (Refereed) Published
Abstract [en]

The solar wind is highly turbulent, and intermittency effects are observed for fluctuations within the inertial range. By analyzing magnetic field spectra and fourth-order moments, we perform a comparative study of turbulence and intermittency in different types of solar wind, measured during periods of solar minima and a maximum. Using eight fast-solar-wind intervals measured during solar minima between 0.3 and 3.16 au, we find a clear signature of two inertial subranges with f−3/2 and f−5/3 power laws in the magnetic power spectra. The intermittency, measured through the scaling law of the kurtosis of the magnetic field fluctuations, further confirms the existence of two different power laws separated by a clear break. A systematic study of the evolution of the said subranges as a function of heliospheric distance shows the correlation of the break scale with both the turbulence outer scale and the typical ion scales. During solar maximum, on the contrary, the two subranges are not omnipresent, thus showing more variability in the power spectra and intermittency scaling properties.

Place, publisher, year, edition, pages
American Astronomical Society , 2025. Vol. 982, no 2, article id 199
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-362514DOI: 10.3847/1538-4357/adba54ISI: 001456035600001Scopus ID: 2-s2.0-105001954389OAI: oai:DiVA.org:kth-362514DiVA, id: diva2:1952962
Note

QC 20250428

Available from: 2025-04-16 Created: 2025-04-16 Last updated: 2025-05-06Bibliographically approved

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