Abstract
The phenomenon of the Gnevyshev gap was first identified in the solar-corona irradiance data (green line). Later, it was studied in the sunspot, coronal, and heliospheric data. We have investigated the Gnevyshev gap in the magnetic field data and have arrived at the conclusion that it reflects the behavior of the large-scale magnetic field. The Gnevyshev gap occurs at the polarity reversal of the solar magnetic field at the photospheric level. The presence of the Gnevyshev gap in sunspot data at the photospheric level is disguised by nonglobal structures that retain dependence on both latitude and longitude (the accepted mathematical term is tessaral; see below for more detail). However, it is clearly visible in the magnetic field data at the photospheric level and is even more pronounced at the source surface (i.e., in the corona).
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Data Availability
All data on photospheric magnetic fields are available at the http://wso.stanford.edu/synopticl.html and sunspot number data from the World Data Center SILSO, Royal Observatory of Belgium, Brussels. Version V2.
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Acknowledgments
The authors thank Todd Hoeksema for presentation of the data.
Funding
VNO and DDS acknowledge the support of the Ministry of Science and Higher Education of the Russian Federation under the grants 075-15-2020-780 (VNO) and 075-15-2022-284 (DDS). DDS thanks support by BASIS fund number 21-1-1-4-1 and the financial support of the Ministry of Education and Science of the Russian Federation as part of the program of the Moscow Center for Fundamental and Applied Mathematics under the agreement N0 075-15-2022-284.
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AS performed material preparation, data collection and analysis were performed by under the guidance of VO and DS. VO prepared the first draft of the manuscript was written by and DS, VO and AS commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Obridko, V.N., Shibalova, A.S. & Sokoloff, D.D. Gnevyshev Gap in the Large-Scale Magnetic Field. Sol Phys 299, 60 (2024). https://doi.org/10.1007/s11207-024-02292-0
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DOI: https://doi.org/10.1007/s11207-024-02292-0