Asymmetry of solar activity in cycle 23

Li, K. J.; Chen, H. D.; Zhan, L. S.; Li, Q. X.; Gao, P. X.; Mu, J.; Shi, X. J.; Zhu, W. W.

doi:10.1029/2009ja014061

Cited by 35 publications

(33 citation statements)

References 38 publications

(63 reference statements)

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“…The comparison of Figs 1(a) and (b) with the fig. 2 of Li et al (2009) clearly indicates that the slopes of straight lines at all and low latitudes have the same sign as those of regression straight lines to the monthly values of the N–S asymmetry of sunspot group numbers and sunspot areas for cycle 23. It means that, at all and low latitudes, the Southern hemispheric CME activity becomes more and more strong, related to the Northern hemispheric CME activity, when CME activity is progressing into cycle 23.…”

Section: Asymmetry Of the Activity Of Cme In Cycle 23mentioning

confidence: 72%

Hemispheric variation of coronal mass ejections in cycle 23

Gao

Shi

2009

Monthly Notices of the Royal Astronomical Society

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In this paper, we analyse the behaviour of the activity of coronal mass ejection (CME) observed by the Large Angle and Spectrometric Coronagraph Experiment on board the Solar and Heliospheric Observatory (SOHO/LASCO) in cycle 23 from 1997 to 2007 separately for the Northern and Southern hemispheres. The results show the following. (1) At all and low latitudes, the dominant hemisphere of the activity of CME changes from the Northern hemisphere before cycle maxima to the Southern hemisphere after cycle maxima; a southern dominance of the activity of CME is shown to occur in cycle 23. This is consistent with sunspot studies. The relationship between the two lines of the cumulative counts of monthly CME numbers for the Northern and Southern hemispheres is similar to those of monthly sunspot group numbers and sunspot areas. (2) At high latitudes, prior to 2002, the trend of the monthly values of the north–south asymmetry of numbers of CMEs is similar to those of sunspot group numbers and sunspot areas; the relationship between the two lines of the cumulative counts of monthly CME numbers for the Northern and Southern hemispheres is similar to those of sunspot group numbers and sunspot areas. However, after 2001, the trend of dominant hemisphere of the activity of CME at high latitudes is different from those of sunspot group numbers and sunspot areas; the relationship between the two lines of the cumulative counts of monthly CME numbers for the Northern and Southern hemispheres at high latitudes is different from those sunspot group numbers and sunspot areas. Our results seem to suggest that the activity of CME at high latitudes should have close connection with ‘rush to the poles’.

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Section: Asymmetry Of the Activity Of Cme In Cycle 23mentioning

confidence: 72%

Hemispheric variation of coronal mass ejections in cycle 23

Gao

Shi

2009

Monthly Notices of the Royal Astronomical Society

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“…The dominance then moved to the southern hemisphere after the solar maximum in 2000. Li et al (2009) predicted that for the forthcoming cycle 24, an asymmetry of solar activity will occur with solar activity remaining dominant in the southern hemisphere. For SC23, we did not detect any preference of solar flares to generate sunquakes in one hemisphere or another.…”

Section: Sunquakes From X-class Solar Flaresmentioning

confidence: 99%

Seismic Transients from Flares in Solar Cycle 23

Donea

2011

Space Sci Rev

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Some solar flares are known to drive seismic waves into the sub-photospheres of the magnetic regions that host them. Sunquakes, which are identified as a wave-packet of ripples are observed on the solar surface emanating from a focal region, known as seismic source or sometimes as a transient. Not all seismic transients from flares generate sunquakes. How these are produced is still a puzzle. In this paper, I will give an overview of the observed properties of sunquakes and efforts to understanding physics underlying them, including numerical modelling of flare-driven oscillations.

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“…The north-south asymmetry in the activity in the solar cycle 23 has been reported (Joshi and Joshi 2004, Li et al 2009, Bankoti et al 2010). An overall dominant southern hemisphere is observed.…”

Section: Resultsmentioning

confidence: 99%

Network and plage indices from Kodaikanal Ca-K data

Raju¹,

Singh²

2014

Res. Astron. Astrophys.

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The Ca II K filtergrams from Kodaikanal Solar Observatory have been used to study the solar activity. The images are dominated by the chromospheric network and plages. Programs have been developed to obtain the network and plage indices from the daily images as functions of solar latitude and time. Preliminary results from the analysis are reported here. The network and plage indices were found to follow the sunspot cycle. A secondary peak is found during the declining activity period in both the indices. A comparison of network indices from the northern and the southern hemispheres shows that the former is more active than latter. However such an asymmetry is not clearly seen in the case of plage index.

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Asymmetry of solar activity in cycle 23

Cited by 35 publications

References 38 publications

Hemispheric variation of coronal mass ejections in cycle 23

Hemispheric variation of coronal mass ejections in cycle 23

Seismic Transients from Flares in Solar Cycle 23

Network and plage indices from Kodaikanal Ca-K data

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