Hemispheric Asymmetry in the Sunspot Cycle as a Nonextensive Phenomenon

Batista, Leonardo F. G.; Santiago, Thiago M.; Silva, Filho, Paulo C. F. da; Silva, Cleo V.; Freitas, D. B. de

doi:10.1007/s11207-023-02179-6

Cited by 2 publications

(1 citation statement)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The noticeable hemispheric imbalance is confirmed by numerous observations (see, e.g., reviews by Hathaway 2015;Usoskin 2017). This phenomenon is constantly in the focus of modern research on sunspot number, areas (Badalyan & Obridko 2017;Chowdhury et al 2019;Veronig et al 2021;Javaraiah 2022;Batista et al 2023;Carrasco et al 2023), and other indicies of the global activity (Xie et al 2018;Vokhmyanin & Zolotova 2022;Taran et al 2022;Zhang et al 2023Zhang et al , 2024Mursula 2023). The understanding of the N-S asymmetry mechanisms is essential for the prediction models (Hathaway & Upton 2016;Lekshmi et al 2019;Labonville et al 2019;Javaraiah 2021;Nandy 2021;Bhowmik et al 2023).…”

Section: Introductionmentioning

confidence: 99%

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

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

Hemispheric analysis of the magnetic flux in regular and irregular solar active regions

Zhukova

2024

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

Studying the hemispheric distribution of active regions (ARs) with different magnetic morphology may clarify the features of the dynamo process that is hidden under the photospheric level. The magnetic flux data for 3047 ARs from the CrAO catalog between May 1996 and December 2021 (cycles 23 and 24) were used to study ARs cyclic variations and perform correlation analysis. According to the magneto-morphological classification (MMC) of ARs proposed earlier, subsets of the regular (obeying empirical rules for sunspots) and irregular (violating these rules) ARs were considered separately. Our analysis shows the following. For ARs of each MMC type, in each of the hemispheres, time profiles demonstrate a multi-peak structure. The double-peak structure of a cycle is formed by ARs of both MMC types in both hemispheres. For the irregular ARs, the pronounced peaks occur in the second maxima (close to the polar field reversal). Their significant hemispheric imbalance might be caused by a weakening of the toroidal field in one of the hemispheres due to the interaction between the dipolar and quadrupolar components of the global field, which facilitates the manifestation of the turbulent component of the dynamo. The similarity of the irregular ARs activity that was found in adjacent cycles in different hemispheres also hints at realization of the mix-parity dynamo solution. For the quadrupolar-like component of the flux (compiled in the simple axisymmetric approximation), signs of oscillations with a period of about 15 years are found, and they are pronounced specifically for the irregular groups. This MMC type ARs might also contribute in α-quenching.

show abstract

Hemispheric Asymmetry in the Sunspot Cycle as a Nonextensive Phenomenon

Cited by 2 publications

References 69 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

Hemispheric analysis of the magnetic flux in regular and irregular solar active regions

Contact Info

Product

Resources

About