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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
Abstract
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.
- 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
- Copyright
- © The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union