North-South asymmetry of some solar parameters: A study based on the dominance of hemispheric sunspot activity during the solar cycles 18–24

El‐Borie, M. A.; El-Taher, A. M.; Thabet, A. A.; Ibrahim, Shakir; Bishara, A. A.

doi:10.1016/j.cjph.2021.02.007

Cited by 5 publications

(3 citation statements)

References 72 publications

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“…This finding may support the known northern/ southern asymmetry in solar activity. El-Borie et al (2021) found that in Solar Cycle 24, (i) sunspot numbers and daily hemispheric sunspot areas have the same level of hemispheric sunspot activity (northern dominance is preferred during the ascending phase of the solar cycle while southern hemispheric dominance has the priority during the descending phase of the solar cycle); (ii) solar radio flux F10.7 has a southern preference by the dominance of 7%; (iii) total solar irradiance has a symmetrical distribution; (iv) plage area has a southern preference by the dominance of 12%; (v) solar flare index has a southern preference by the dominance of 34%; and (vi) solar mean magnetic field (|B|) has a southern preference for the Solar Cycles 21-24. It turns out that what we have found with the coronal jets is consistent with these findings and confirms the north/south asymmetry.…”

Section: Oscillatory Pattern In the Loci Of Coronal Jetsmentioning

confidence: 99%

“…Janardhan et al (2018) argued that the southern solar hemisphere unambiguously reversed polarity before the maximum of Solar Cycle 24. El-Borie et al (2021) summarized in detail which hemisphere was dominated by, e.g., sunspot number, solar radio flux, and solar mean magnetic field in Solar Cycle 24. All these studies (and others not mentioned here) inspire us to raise the question: do the physical parameters and properties of the localized jets also follow solar cyclic variations?…”

Section: Introductionmentioning

confidence: 99%

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Evolution of Coronal Jets during Solar Cycle 24

Soós,

Liu 刘,

Korsós

et al. 2024

ApJ

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The focus of this study is on the spatial and temporal distributions of 2704 solar jets throughout Solar Cycle 24, from beginning to end. This work is a follow-up paper by Liu et al. With this extended data set, we have further confirmed the two distinct distributions of coronal jets: one located in polar regions and another at lower latitudes. Further analysis of the series of coronal jets revealed kink oscillations of the global solar magnetic field. Additionally, studying the northern and southern hemispheres separately showed an antiphase correlation that can be interpreted as a global sausage oscillatory pattern of the loci of the coronal jets. We also investigated how the variability of the solar cycle may impact the power law index of coronal jets by dividing the data set into the rising and declining phases of Solar Cycle 24. However, there is no compelling evidence to suggest that the power law index changes after the maximum. It is worth noting that based on this vast database of solar jets, the degradation of the 304 Å channel of the Atmospheric Imaging Assembly instrument on board the Solar Dynamics Observatory can also be identified and confirmed. Finally, we searched for compelling signatures of the presence of active longitude in the coronal jet database. There was no obvious evidence with a high probability of an active longitude; therefore, this question remains yet to be addressed further.

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Section: Oscillatory Pattern In the Loci Of Coronal Jetsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evolution of Coronal Jets during Solar Cycle 24

Soós,

Liu 刘,

Korsós

et al. 2024

ApJ

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“…Later, Schwabe (1844) deduced the spottedness of the Sun waxed and waned over an 11-year cyclic period. More recently, several studies (e.g., Norton, Charbonneau, and Passos, 2014;Deng et al, 2016;El-Borie, Abdel-halim, and El-Monier, 2016;Badalyan and Obridko, 2017;El-Borie et al, 2021) showed that various solar magnetic activity indicators, such as sunspots, faculae, and flares, typically are distributed unevenly between the northern and southern hemisphere of the Sun a.k.a solar hemispheric asymmetry.…”

Section: Introductionmentioning

confidence: 99%

Hemispheric asymmetry in the sunspot cycle as a nonextensive phenomenon

Batista

Santiago

Silva

et al. 2022

Preprint

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The appearance of dark sunspots over the solar photosphere is not considered to be symmetric between the northern and southern hemispheres. Among the different conclusions obtained by several authors, we can point out that the North-South asymmetry is a real and systematic phenomenon and is not due to random variability. In the present work, we selected the sunspot area data of a sample of 13 solar cycles divided by hemisphere extracted from the Marshall Space Flight Centre (MSFC) database to investigate the behavior of probability distributions using an out-of-equilibrium statistical model a.k.a non-extensive statistical mechanics. Based on this statistical framework, we obtained that the non-extensive entropic parameter q has a semi-sinusoidal variation with a period of ∼22 year (Hale cycle). Among the most important results, we can highlight that the asymmetry index q(A) revealed the dominance of the northern hemisphere against the southern one. Thus, we concluded that the parameter q(A) can be considered an effective measure for diagnosing long-term variations of the solar dynamo. Finally, our study opens a new approach to investigating solar variability from the nonextensive perspective.

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Hemispheric Asymmetry in the Sunspot Cycle as a Nonextensive Phenomenon

et al. 2023

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The appearance of dark sunspots over the solar photosphere is not considered to be symmetric between the northern and southern hemispheres. Among the different conclusions obtained by several authors, we can point out that the North-South asymmetry is a real and systematic phenomenon and is not due to random variability. In the present work, we selected the sunspot area data of a sample of 13 solar cycles divided by hemisphere extracted from the Marshall Space Flight Centre (MSFC) database to investigate the behavior of probability distributions using an out-of-equilibrium statistical model a.k.a nonextensive statistical mechanics. Based on this statistical framework, we obtained that the non-extensive entropic parameter q has a semi-sinusoidal variation with a period of ∼22 year (Hale cycle). Among the most important results, we can highlight that the asymmetry index q(A) revealed the dominance of the northern hemisphere against the southern one. Thus, we concluded that the parameter q(A) can be considered an effective measure for diagnosing long-term variations

show abstract

North-South asymmetry of some solar parameters: A study based on the dominance of hemispheric sunspot activity during the solar cycles 18–24

Cited by 5 publications

References 72 publications

Evolution of Coronal Jets during Solar Cycle 24

Evolution of Coronal Jets during Solar Cycle 24

Hemispheric asymmetry in the sunspot cycle as a nonextensive phenomenon

Hemispheric Asymmetry in the Sunspot Cycle as a Nonextensive Phenomenon

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