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Possibility of Diagnostics of the Beginning of Solar Cycle 25 Based on Its Precursors at Mid-Heliolatitudes  

Alexey Golovko   Submitted: 2020-12-21 23:40

The potential to diagnose the beginning of the solar cycle based on the detection of small-scale magnetic formations, the magnetic nodes of ephemeral active regions in the zone of mid-heliolatitudes from 40 to 60, has been studied. Magnetic nodes were detected at the stage of their emergence by the multifractal segmentation method, which was previously used to fix new magnetic fluxes of active regions in the zone of low heliolatitudes. Statistical estimates of the number of magnetic nodes recorded by this method were performed based on magnetograph data from the Synoptic Optical Long-term Investigations of the Sun of the National Solar Observatory (SOLIS NSO) for the 24th solar activity cycle, as well as for the beginning of the 25th activity cycle. A precursor of solar cycle 24 has been found in the form of a burst in the number of magnetic nodes in 20072008 that significantly exceeds the background value characteristic of the period 20112015. Two years later, the first active regions began to appear at latitudes of 30 10. A similar sequence of phases in the beginning of the cycle was found for cycle 25. Unlike the situation with solar cycle 24, the mass appearance of high-latitude active regions of cycle 25 occurred about 2.5 years after the burst in the number of nodes of ephemeral active regions.

Authors: A.A.Golovko
Projects: None

Publication Status: Published in Geomagnetism and Aeronomy, 2020, Vol. 60, No. 6, pp. 684-692.
Last Modified: 2020-12-22 08:38
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Detecting the solar new magnetic flux regions on the base of vector magnetograms  

Alexey Golovko   Submitted: 2018-07-27 00:52

To understand better the origin of CME and other non-stationary processes, the detailed information about emerging flux regions must be known. The advanced method of mapping emerging magnetic flux regions through the multifractal segmentation of vector photospheric magnetograms, is created. It is free from influence of effects of projection. Maps of the vertical component of the field Hz and of the two transversal components Hx, Hy are processed separately and the computed segmented images are summarized. As a result, the detailed picture of distribution of new magnetic fluxes at the current time, is obtained. The SOT Hinode magnetograms for 2006-2015 were used. Observations of the flare-productive active regions NOAA 11158 and 11520 were processed. Hills of a new field in case of their birth have the considerable elongation which is possibly related to their rope-like geometry. In the centers of flare activity, in the vicinity of polarity inversion lines, exits of new magnetic flux alternate with processes of "magnetic cancellation".

Authors: A.A.GolovkoI, I.I.Salakhutdinova
Projects: None

Publication Status: Published in Journal of Atmospheric and Solar-Terrestrial Physics Volume 179, November 2018, Pages 120-127
Last Modified: 2018-08-17 09:44
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Possibility of Diagnostics of the Beginning of Solar Cycle 25 Based on Its Precursors at Mid-Heliolatitudes
Detecting the solar new magnetic flux regions on the base of vector magnetograms

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