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Spectral Properties of the Magnetic Field During the Matuyama-Brunhes Inversion
- Authors: Reshetnyak M.Y.1
-
Affiliations:
- Schmidt Institute of Physics of the Earth, Russian Academy of Sciences
- Issue: No 6 (2025)
- Pages: 113-119
- Section: Articles
- URL: https://journals.rcsi.science/0002-3337/article/view/365753
- DOI: https://doi.org/10.7868/S3034645225060091
- ID: 365753
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Abstract
It is shown that, according to observations, during the last geomagnetic field inversion, there was a decrease in the amplitude of four axisymmetric harmonics in the expansion of the magnetic field in spherical functions. Only the dipole component changed sign at the moment of reversal. For all four modes, quasi-variations with characteristic times of 10–50 thousand years were observed over an interval of 200 thousand years. During the reversal, there was an increase in magnetic field variations with characteristic times of 100–1000 years, caused by the destabilization of hydrodynamic flows in the core.
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About the authors
M. Yu. Reshetnyak
Schmidt Institute of Physics of the Earth, Russian Academy of Sciences
Email: m.reshetnyak@gmail.com
Moscow
References
- Гурарий Г.З., Багин В.И., Гарбузенко А.В., Решетняк М.Ю., Трубихин В.М., Назаров Х. Вариации геомагнитного поля до и после инверсии Матуяма–Харамильо (Западная Туркмения) // Физика Земли. 2000. № 7. C.31–42.
- Паркинсон У. Введение в геомагнетизм. М.: Мир. 1986.
- Решетняк М.Ю. Подавление турбулентности магнитным полем во время инверсий // Вестник Московского Университета. Серия 3. Физика. Астрономия. 2022. № 3. C. 44–50.
- Решетняк М.Ю. Поведение геомагнитного поля во время инверсий и экскурсов // Вестник Московского Университета. Серия 3. Физика. Астрономия. 2024. Т. 79. № 1. C. 2410901.
- Фрик П.Г. Турбулентность: модели и подходы. курс лекций. Пермь: Пермский государственный университет. Т. 2. 1999. 136с.
- Chandrasekhar S. Hydrodynamics and hydromagnetic stability. NY: Dover Publications, Inc. 1981. 654 p.
- Christensen U.R., Tilgner A. Power requirement of the geodynamo from ohmic losses in numerical and laboratory dynamos // Nature. 2004. V.429. № 6988. P.169–171.
- Christensen U.R., Aubert J. Scaling properties of convection-driven dynamos in rotating spherical shells and application to planetary magnetic fields // Geophys. J. Int. 2006. V. 166. № 1. P. 97–114.
- Hulot G., Mouël J. Le. A statistical approach to the earth’s main magnetic field // Phys. Earth Planet. Int. 1994. V. 82. № 3–4. P. 167–183.
- Mahgoub A.N., Korte M., Panovska S. Characteristics of the matuyama-brunhes magnetic field reversal based on a global data compilation // J. Geophys. Res.: Solid Earth. 2023. V. 128. № 2. P. 1–34.
- Reshetnyak M.Yu., Hejda P. Heat flux modulation in domino dynamo model // Open Journal of Geology. 2013. V. 3. № 2B. P. 55–59.
- Reshetnyak M.Yu. Reversals and large-scale variations of the geomagnetic field: similarities and differences // Russ. J. Earth Sci. 2024. V.22. P.ES2006–1–8.
- Valet J.-P., Meynadier L., Guyodo Y. Geomagnetic dipole strength and reversal rate over the past two million years // Nature. 2005. V. 435. № 7043. P.802–805.
- Wicht J., Olson P. A detailed study of the polarity reversal mechanism in a numerical dynamo model // Geochem., Geophys., Geosyst. 2004. V.5. № 3. P.1–23.
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