Analysis of the Properties of SEP Events and Their Solar Sources Taking Into Account of the Magneto-Morphological Classification of Active Regions

Kashapova, L. K.; Zhukova, A. V.; Miteva, Rositsa; Zhdanov, Dmitriy; Myagkova, I. N.; Meshalkina, N. S.

doi:10.1134/s0016793221070082

Cited by 6 publications

(4 citation statements)

References 25 publications

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“…The irregular groups profiles demonstrate more peculiarities in the second maxima. Although the number of the irregular ARs is half the number of regular groups (Abramenko et al 2018;Kashapova et al 2021), their fluxes exceed the regular ARs fluxes in this temporal interval (Abramenko et al 2023). As it follows from Fig.…”

Section: Temporal Variations Of the Regular And Irregular Ars In Diff...mentioning

confidence: 60%

“…(ii) For both studied cycles, although the number of the irregular ARs is half less than the number of the regular groups (Abramenko et al 2018;Kashapova et al 2021), the irregular AR fluxes are comparable with ones of the regular groups (Nhemisphere) or exceed them (S-hemisphere, second main maximum). As it was mentioned in the Introduction, the increase in the total irregular ARs fluxes in the second maximum is supposed to be due to the turbulent component of the dynamo (Abramenko et al 2023).…”

Section: Discussionmentioning

confidence: 87%

“…), ARs-'violators' are the integral part of the mechanism of solar activity and have special functionality in closing the dynamo loop. Apart of that, the irregular ARs are the source of strong flares and geoeffective events (Abramenko 2021;Kashapova et al 2021), which immensely impact the solar-terrestrial system (see, e.g., the recent review by Nandy et al 2023, and references therein). Please note that, on the one hand, the irregular ARs show significant fluxes comparable to those of the regular groups.…”

Section: Discussionmentioning

confidence: 99%

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The Effect of the Method of Processing Long Series of Observations on the Display of Cyclic Variations of Regular and Irregular Active Regions

Zhukova¹

2022

Proceedings of the 26th All-Russia Conference on Solar and Solar-Terrestrial Physics

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The catalog of magneto-morphological classes of active regions (ARs) CrAO (https://sun.crao.ru/databases/catalog-mmc-ars) was used to study 2046 ARs of the solar cycle 23 and 1507 ARs of the solar cycle 24. All ARs, except for unipolar spots, were divided into regular (obeying the Hale's polarity law, the Joy's law and the rule of the leading sunspot dominance) and irregular ARs (all others). The results of using different processing methods for cyclic variations of ARs of both types are compared. We used the following methods: a 13-rotation moving average, a cubic spline-approximation for noisy data using crossvalidation statistical technique to estimate the smoothing parameter, smoothing by the Gaussian function kernel, and the minimizing-variance method. All smoothing results are close to the results obtained using the traditional moving-average method. At the same time, the use of cubic spline-approximation makes it possible to achieve a smoother shape of the curves, smoothing by the Gaussian kernel makes the multi-peak structure of the cycle more pronounced, especially for irregular ARs.

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Section: Temporal Variations Of the Regular And Irregular Ars In Diff...mentioning

confidence: 60%

Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

The Effect of the Method of Processing Long Series of Observations on the Display of Cyclic Variations of Regular and Irregular Active Regions

Zhukova¹

2022

Proceedings of the 26th All-Russia Conference on Solar and Solar-Terrestrial Physics

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“…A reverse-polarity orientation is often found in ARs with dominating -configuration of the magnetic field. Such ARs are known for their high flaring productivity and initiation of strong geomagnetic events and therefore emphasize their importance in the influence of space weather (Smith & Howard 1968;Knizhnik et al 2018;Abramenko 2021;Kashapova et al 2021).…”

Section: Studies Of Ars Violating the Hale Polarity Law (Anti-halementioning

confidence: 99%

Synthetic solar cycle for active regions violating the Hale's polarity law

Zhukova,

Khlystova,

Abramenko

et al. 2022

Preprint

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Long observational series for bipolar active regions (ARs) provide significant information about the mutual transformation of the poloidal and toroidal components of the global solar magnetic field. The direction of the toroidal field determines the polarity of leading sunspots in ARs in accordance with the Hale's polarity law. The vast majority of bipolar ARs obey this regularity, whereas a few percent of ARs have the opposite sense of polarity (anti-Hale ARs). However, the study of these ARs is hampered by their poor statistics. The data for five 11-year cycles (16-18 and 23,24) were combined here to compile a synthetic cycle of unique time length and latitudinal width. The synthetic cycle comprises data for 14838 ARs and 367 of them are the anti-Hale ARs. A specific routine to compile the synthetic cycle was demonstrated. We found that, in general, anti-Hale ARs follow the solar cycle and are spread throughout the time-latitude diagram evenly, which implies their fundamental connection with the global dynamo mechanism and the toroidal flux system. The increase in their number and percentage occurs in the second part of the cycle, which is in favour of their contribution to the polar field reversal. The excess in the anti-Hale ARs percentage at the edges of the butterfly diagram and near an oncoming solar minimum (where the toroidal field weakens) might be associated with strengthening of the influence of turbulent convection and magnetic field fluctuations on the arising flux tubes. The evidence of the misalignment between the magnetic and heliographic equators is also found.

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The north-south asymmetry of active regions of different magneto-morphological types in solar cycles 23 and 24

Zhukova

Sokoloff²,

Abramenko³

et al. 2023

Advances in Space Research

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Analysis of the Properties of SEP Events and Their Solar Sources Taking Into Account of the Magneto-Morphological Classification of Active Regions

Cited by 6 publications

References 25 publications

The Effect of the Method of Processing Long Series of Observations on the Display of Cyclic Variations of Regular and Irregular Active Regions

The Effect of the Method of Processing Long Series of Observations on the Display of Cyclic Variations of Regular and Irregular Active Regions

Synthetic solar cycle for active regions violating the Hale's polarity law

The north-south asymmetry of active regions of different magneto-morphological types in solar cycles 23 and 24

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