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Interplanetary magnetic correlation and low-frequency spectrum over many solar rotations.

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Title: Interplanetary magnetic correlation and low-frequency spectrum over many solar rotations.
Authors: Wang(王嘉明), Jiaming1, Pecora, Francesco1, Chhiber, Rohit1,2, Roy, Sohom1, Matthaeus, William H.1 whm@udel.edu
Source: Proceedings of the National Academy of Sciences of the United States of America. 1/6/2026, Vol. 123 Issue 1, p1-11. 11p.
Subjects: Interplanetary medium, Rotation of the Sun, Frequency spectra, Sun, Cosmic rays, Force & energy, Magnetic coupling, Pink noise
Abstract: Fluctuations and structure across a wide range of spatial and temporal scales are frequently studied in the solar wind. The properties of the low-frequency fluctuations are of relevance to turbulent energy injection into the plasma and the transport of highenergy cosmic rays. Correlation analysis of decade-long intervals of interplanetary data permits study of fluctuations at time scales much longer than suitably defined correlation times, and therefore at frequencies well below those associated with the Kolmogorov inertial range of in situ turbulence. At the frequencies of interest, we study the familiar occurrence of the 1/f spectral signature. We also study point spectral features due to solar rotation and their relation with the 1/f signal. We report properties at timescales ranging from minutes up to years, using data selected by wind speed, phase of solar cycle, and cartesian components of the magnetic field. A surprising finding is that the power in solar rotation harmonics is consistent with an extension of the 1/f spectrum, down to frequencies as low as around 5 × 10−7 Hz. The presence of a broadband 1/f spectrum across different wind types supports the interpretation that 1/f signals may be related to or even originate from the solar dynamo. [ABSTRACT FROM AUTHOR]
Copyright of Proceedings of the National Academy of Sciences of the United States of America is the property of National Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 190728226
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Interplanetary magnetic correlation and low-frequency spectrum over many solar rotations.
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  Data: <searchLink fieldCode="AR" term="%22Wang%28王嘉明%29%2C+Jiaming%22">Wang(王嘉明), Jiaming</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Pecora%2C+Francesco%22">Pecora, Francesco</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Chhiber%2C+Rohit%22">Chhiber, Rohit</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Roy%2C+Sohom%22">Roy, Sohom</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Matthaeus%2C+William+H%2E%22">Matthaeus, William H.</searchLink><relatesTo>1</relatesTo><i> whm@udel.edu</i>
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  Data: <searchLink fieldCode="DE" term="%22Interplanetary+medium%22">Interplanetary medium</searchLink><br /><searchLink fieldCode="DE" term="%22Rotation+of+the+Sun%22">Rotation of the Sun</searchLink><br /><searchLink fieldCode="DE" term="%22Frequency+spectra%22">Frequency spectra</searchLink><br /><searchLink fieldCode="DE" term="%22Sun%22">Sun</searchLink><br /><searchLink fieldCode="DE" term="%22Cosmic+rays%22">Cosmic rays</searchLink><br /><searchLink fieldCode="DE" term="%22Force+%26+energy%22">Force & energy</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+coupling%22">Magnetic coupling</searchLink><br /><searchLink fieldCode="DE" term="%22Pink+noise%22">Pink noise</searchLink>
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  Data: Fluctuations and structure across a wide range of spatial and temporal scales are frequently studied in the solar wind. The properties of the low-frequency fluctuations are of relevance to turbulent energy injection into the plasma and the transport of highenergy cosmic rays. Correlation analysis of decade-long intervals of interplanetary data permits study of fluctuations at time scales much longer than suitably defined correlation times, and therefore at frequencies well below those associated with the Kolmogorov inertial range of in situ turbulence. At the frequencies of interest, we study the familiar occurrence of the 1/f spectral signature. We also study point spectral features due to solar rotation and their relation with the 1/f signal. We report properties at timescales ranging from minutes up to years, using data selected by wind speed, phase of solar cycle, and cartesian components of the magnetic field. A surprising finding is that the power in solar rotation harmonics is consistent with an extension of the 1/f spectrum, down to frequencies as low as around 5 × 10−7 Hz. The presence of a broadband 1/f spectrum across different wind types supports the interpretation that 1/f signals may be related to or even originate from the solar dynamo. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Proceedings of the National Academy of Sciences of the United States of America is the property of National Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.1073/pnas.2519811122
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        Text: English
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      – SubjectFull: Interplanetary medium
        Type: general
      – SubjectFull: Rotation of the Sun
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      – SubjectFull: Frequency spectra
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      – SubjectFull: Sun
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      – SubjectFull: Cosmic rays
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      – SubjectFull: Force & energy
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      – SubjectFull: Magnetic coupling
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      – SubjectFull: Pink noise
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            NameFull: Wang(王嘉明), Jiaming
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              Text: 1/6/2026
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              Y: 2026
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