Study of Distribution and Asymmetry of Solar Active Prominences during Solar Cycle 23

Joshi, Navin Chandra; Bankoti, Neeraj Singh; Pande, Seema; Pande, Bimal; Pandey, Kavita

doi:10.1007/s11207-009-9446-2

Cited by 23 publications

(17 citation statements)

References 21 publications

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“…The N-S asymmetries of different solar activities have been extensively studied by various authors (Maunder 1904;Newton & Milson 1955;Howard 1974;Knoska 1985;Vizoso & Ballester 1987;Oliver & Ballester 1994Atac & Ozguc 1996, 2001Verma 1987Verma , 1993Verma , 2000Joshi & Joshi 2004;Knaack et al 2004;Joshi et al 2006;Gao et al 2007Gao et al , 2009Yan et al 2008;Joshi et al 2009Joshi et al , 2010Bankoti et al 2010Bankoti et al , 2011Chang 2007, Corresponding author: bench@ynao.ac.cn 2009Cho & Chang 2011;Deng et al 2012a). Long-term observations of various solar activity phenomena indicate that their occurrence in the northern and southern hemispheres on the solar disk are not uniform, with more events occurring in one or the other hemisphere during certain periods of time.…”

Section: Introductionmentioning

confidence: 99%

The hemispheric variation of the flare index during solar cycles 20–23

Deng¹,

Qu²,

Liu³

et al. 2013

Astron Nachr

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In this paper, the monthly counts of flare index in the northern and southern hemispheres are used to investigate the hemispheric variation of the flare index in each of solar cycles 20–23. It is found that, (1) the flare index is asymmetrically distributed in each solar cycle and its asymmetry is a real phenomenon; (2) the flare index in the northern hemisphere begins earlier than that in the southern hemisphere in each of solar cycles 20–23, and the phase shifts between the two hemispheres show an odd‐even pattern; (3) although the flare index dominating in a hemisphere does not mean that it leads in phase in this hemisphere in individual solar cycle, these two features have an intrinsic relationship. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Introductionmentioning

confidence: 99%

The hemispheric variation of the flare index during solar cycles 20–23

Deng¹,

Qu²,

Liu³

et al. 2013

Astron Nachr

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“…However, in cycle 21, the southern hemisphere is dominant. Joshi et al (2009) presented the results of a study of the spatial distribution and asymmetry of solar active prominences (SAP) for the period 1996 through 2007 (solar cycle 23). During the rising phase of the cycle, the number of SAP events are roughly equal in the northern and southern hemispheres, but the activity in the southern hemisphere was dominant since 1999.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Flux rope proxies during 2013 detected by the Solar Dynamics Observatory

Zhang

Yang

2015

A&A

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Context. The relationship between flux ropes and coronal mass ejections (CMEs) is of great importance for understanding the CME initiation, but we do not know how many flux ropes in the atmosphere can be detected. Aims. We aim to determine the number of flux rope proxies and understand the distribution of the proxies over the visible solar disk. Methods. By employing the observations from the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory, we counted the number of the flux rope proxies from 2013 January to 2013 December. Results. We detected 1354 (3.7 every day) rope proxies during this period and classified them into three types according to their temperature properties and particular (sigmoid) structures. The first type is that the rope proxies are detected in both lower and higher temperature lines. The second is that the rope proxies can only be detected in higher temperature lines, and the third is that the proxies display sigmoid structures in extreme ultraviolet channels. Six hundred and fifty-eight proxies of the 1354 that belong to the first type are tracked by active or eruptive material of filaments or prominences. Four hundred and eighty-seven proxies appear to be rising from the lower atmosphere or brightening in the corona, and belong to the second type. The remaining 209 display sigmoid structures, and they are attributed to the third type. We detected 497 rope proxies, which is 37% of the total, in the northern hemisphere. Conclusions. Our findings imply a significantly asymmetric distribution of the rope proxies over the visible solar disk.

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“…Joshi, et al [34], have published the results of a study of the spatial distribution and asymmetry of solar active protuberances during the period 1996-2007. Their statistical study shows that the north-south asymmetry is more significant than the east-west asymmetry [34].…”

Section: Discussionmentioning

confidence: 99%

Statistical study of the north–south asymmetry of the solar differential rotation based on various solar structures during 1966–1985

2011

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The time variation and latitude dependence of the solar rotation are found using observational data on Hα filaments and compact magnetic features with different polarities during solar activity cycles 20 and 21 (1966-1985). Statistical analysis of the observational data shows that there is a north-south asymmetry in the rotation, both for the Hα filaments and for compact magnetic features (structures) with negative and positive polarities. The N-S asymmetry in the differential rotation of the Hα filaments and the compact magnetic features with both polarities shows up quite distinctly in solar activity cycles 20 and 21, but the asymmetry for the compact magnetic features with positive polarity is comparatively lower in cycle 21. The confidence level is lower the compact magnetic features with positive polarity than for the compact magnetic features with negative polarity.

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Study of Distribution and Asymmetry of Solar Active Prominences during Solar Cycle 23

Abstract: In this paper we present the results of a study of the spatial distribution and asymmetry of solar However, activity on the southern hemisphere has been dominant since 1999. Our statistical study shows that the N-S asymmetry is more significant then the E-W asymmetry.

Cited by 23 publications

References 21 publications

The hemispheric variation of the flare index during solar cycles 20–23

The hemispheric variation of the flare index during solar cycles 20–23

Flux rope proxies during 2013 detected by the Solar Dynamics Observatory

Statistical study of the north–south asymmetry of the solar differential rotation based on various solar structures during 1966–1985

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