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Terrestrial volcanic eruptions and their possible links with solar activity View all abstracts by submitter

Valentina Zharkova   Submitted: 2022-07-14 07:22

We compare frequencies of volcanic eruptions in the past 270 years with the variations of solar activity and summary curve of eigen vectors (EVs) of the solar background magnetic field (SBMF) derived from the WSO synoptic magnetic maps. Quartile distributions of volcanic eruption (VE) frequencies over the four phases of a 11 year cycle (growth, maximum, descent and minimum) reveal higher numbers of eruptions occurring at the maxima of SBMF with southern polarity with some higher levels of eruptions at the minima of sunspot numbers. The frequency analysis of VEs with Morlet wavelet reveals that the period of 22 years to be much stronger pronounced than of 11 years. Comparison of VE frequencies with the summary curve of EVs of SBMF for 11 cycles after 1868 reveals a strong positive correlation (coefficient of 0.84) with the southern polarity magnetic field, while for 8 cycles before 1868 the correlation becomes much lower (coefficient -0.33) and negative. This change of correlation} from 1868 can reflect real changes in VE frequencies caused by migration of the Earth's magnetic pole to lower latitudes, or some differences in proxies of solar cycles. The maxima of VEs are shown to occur during maxima of solar activity cycles with southern magnetic polarity that can be associated with increased disturbances in the geomagnetic field. The next anticipated maximum of VEs is expected during cycle 26 (2031-2042), when SBMF will have a southern magnetic polarity that can affect solar radiation input to Earth in the current Grand Solar Minimum.

Authors: Vasilieva I. and Zharkova V.
Projects: None

Publication Status: Astrophysical journal, in press
Last Modified: 2022-07-15 09:52
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