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Power spectra of the Sun’s large-scale magnetic field during solar cycles 23 and 24

Published online by Cambridge University Press:  28 September 2023

Yukun Luo Open the ORCID record for Yukun Luo [Opens in a new window] ,
Jie Jiang Open the ORCID record for Jie Jiang [Opens in a new window]  and
Ruihui Wang Open the ORCID record for Ruihui Wang [Opens in a new window]
Yukun Luo
Affiliation:
School of Space and Environment, Beihang University, Beijing, China Key Laboratory of Space Environment monitoring and Information Processing of MIIT, Beijing, China
Jie Jiang
Affiliation:
School of Space and Environment, Beihang University, Beijing, China Key Laboratory of Space Environment monitoring and Information Processing of MIIT, Beijing, China
Ruihui Wang
Affiliation:
School of Space and Environment, Beihang University, Beijing, China Key Laboratory of Space Environment monitoring and Information Processing of MIIT, Beijing, China
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Abstract

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The magnetic power spectrum analysis provides an effective way to understand the observed distribution of the photospheric magnetic fields and their interaction with plasma motions. We aim to investigate the power spectra using spherical harmonic decomposition of SOHO/MDI and SDO/HMI synoptic magnetograms for cycles 23 and 24. We find that the calibration factor between MDI and HMI power spectral density is spatial scale-dependent. The magnetic power spectra show two peaks at the AR scale (l≈30) and supergranular scale (l≈120). The power law indices between these show a good anti-correlation with the amplitude of magnetic activity.

Keywords

Sun: magnetic fieldsSun: activitySun: photosphere
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S372: The Era of Multi-Messenger Solar Physics , August 2022 , pp. 81 - 83
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

References

Liu, Y., Hoeksema, J. T., Scherrer, P. H., et al. 2012, Sol. Phys., 279, 295 CrossRefGoogle Scholar
Supplementary material: PDF

Luo et al. supplementary material

Luo et al. supplementary material

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