Abstract
We carried out exploratory statistical and probabilistic analyzes of power P = dE/dt of the observable potential geomagnetic field, where E is the total energy of the field. The field are taken from the geomagnetic model COV-OBS. ×1 1840–2020. The power is predominantly negative and takes values from −507 to +117 MW. Despite the extreme variability of the power P, its absolute value is three to four orders of magnitude smaller than the power required to maintain the geodynamo. The distribution function or, in other words, power spectrum is multimodal and its most significant almost flat part is in the range from −200 to −50 MW corresponding to the almost discrete spectrum of the energy. These main features and other statistical-probabilistic results are consistent with geomagnetic and geodynamo models, both in terms of the variability of the dipole field and of corresponding characteristic time scales, which are mostly of the order of a thousand years. We highlight a significant separate probabilistic mode with a power of about 500 MW, which may be associated with field variations with the duration of ~500 years.
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The authors are grateful to IZMIRAN for financial assistance in the preparation of the article, and to three anonymous referees who helped us to improve this work significantly.
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Starchenko, S.V., Yakovleva, S.V. (2023). Visual Statistics of the Total Geomagnetic Field Power. In: Kosterov, A., Lyskova, E., Mironova, I., Apatenkov, S., Baranov, S. (eds) Problems of Geocosmos—2022. ICS 2022. Springer Proceedings in Earth and Environmental Sciences. Springer, Cham. https://doi.org/10.1007/978-3-031-40728-4_9
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