Phase asynchrony of the north-south sunspot activity

Zolotova, N. V.; Ponyavin, D. I.

doi:10.1051/0004-6361:200600013

Cited by 102 publications

(74 citation statements)

References 12 publications

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“…In contrast to our previous analysis (Zolotova & Ponyavin 2006 in which raw (unsmoothed) data were analysed, we used filtered (smoothed) data. Smoothing of the data allows an accurate detection of the LOS in the CRP.…”

Section: Data and Resultsmentioning

confidence: 99%

“…It is also important to point out that CRPs require time series of the same observable and similar amplitude variations in both x and y. However, a CRP can be useful for detecting differences in timescales between two different data series or dynamical systems, as shown for geophysical measurements of lake sediments (Marwan et al 2002;Marwan & Kurths 2005) or phase differences in the occurence of sunspots (Zolotova & Ponyavin 2006). CRPs were initially introduced to study dynamical systems of higher dimensions, i.e., by considering phase space vectors x ∈ R m , but can be analogously applied to the analysis of spatio-temporal data (Vasconcelos et al 2006;Marwan et al 2007a,b), as in the case of sunspot activity data.…”

Section: Methodsmentioning

confidence: 99%

“…Applying CRPs to the raw monthly sunspot area time series, we have shown that run-time differences between northern and southern sunspot appearances exhibit non-random quasi-regular behaviour (Zolotova & Ponyavin 2006). This approach allows us to determine the asymmetry in the northern and southern sunspot activities as an effect of a synchronisation between hemispheres.…”

Section: Introductionmentioning

confidence: 99%

“…The NA measure "loses all information about the latitude variations of sunspots" (Pulkkinen et al 1999) and hides phase hemispheric relationships (Zolotova & Ponyavin 2006), because of the definition of NA as instantaneous amplitude dominance of the northern over southern hemisphere and vice versa. Waldmeier (1957) suggested a 80-year period for the hemispheric asymmetry of sunspot activity, phase shift, and height variations at solar maxima.…”

Section: Introductionmentioning

confidence: 99%

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Long-term asymmetry in the wings of the butterfly diagram

Zolotova

Ponyavin

Marwan

et al. 2009

A&A

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Aims. Sunspot distribution in the northern and southern solar hemispheres exibit striking synchronous behaviour on the scale of a Schwabe cycle. However, sometimes the bilateral symmetry of the Butterfly diagram relative to the solar equatorial plane breaks down. The investigation of this phenomenon is important to explaining the almost-periodic behaviour of solar cycles. Methods. We use cross-recurrence plots for the study of the time-varying phase asymmetry of the northern and southern hemisphere and compare our results with the latitudinal distribution of the sunspots. Results. We observe a long-term persistence of phase leading in one of the hemispheres, which lasts almost 4 solar cycles and probably corresponds to the Gleissberg cycle. Long-term variations in the hemispheric-leading do not demonstrate clear periodicity but are strongly anti-correlated with the long-term variations in the magnetic equator.

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Section: Data and Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Long-term asymmetry in the wings of the butterfly diagram

Zolotova

Ponyavin

Marwan

et al. 2009

A&A

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“…One may also wish to check its validity of some research on the latitudinal migration of solar activity. For example, some researchers have reported that latitudinal migration of sunspots asynchronously occur in the northern and southern hemispheres (Waldmeier 1971, Swinson et al 1986, Zolotova & Ponyavin 2006, Donner & Thiel 2007, Zolotova et al 2009, Li et al 2009a, b, 2010. They have attempted to explain the solar North-South asymmetry with such a phase difference between paired wings of the butterfly diagram instead of appreciating the real asymmetry in two hemispheres.…”

Section: Center-of-latitude Of Sunspotmentioning

confidence: 99%

Latitudinal Distribution of Sunspots Revisited

Cho¹,

Chang²

2011

Journal of Astronomy and Space Sciences

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Characteristics of latitude variations of sunspots in the northern and southern hemispheres are investigated using the daily sunspot area and its latitude during the period from 1874 to 2009. Solar magnetic activity is portrayed in the form of sunspot, regions of concentrated fresh magnetic fields observed on the surface of the Sun. By defining center-oflatitude (COL) as an area-weighted latitude, we find that COL is not monotonically decreasing as commonly assumed. In fact, small humps (or short plateaus) between solar minima can be seen around every solar maxima. We also find that when the northern (southern) hemisphere is magnetically dominant, COL is positive (negative), except the solar cycle 23, which may give a hint that these two phenomena are consistently regulated by one single mechanism. As a result of periodicity analysis, we find that several significant periodicities, such as, of ~5.5, ~11, ~49, and ~167 years.

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Coronal and heliospheric magnetic flux circulation and its relation to open solar flux evolution

et al. 2017

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Solar cycle 24 is notable for three features that can be found in previous cycles but which have been unusually prominent: (1) sunspot activity was considerably greater in the northern/southern hemisphere during the rising/declining phase; (2) accumulation of open solar flux (OSF) during the rising phase was modest, but rapid in the early declining phase; (3) the heliospheric current sheet (HCS) tilt showed large fluctuations. We show that these features had a major influence on the progression of the cycle. All flux emergence causes a rise then a fall in OSF, but only OSF with foot points in opposing hemispheres progresses the solar cycle via the evolution of the polar fields. Emergence in one hemisphere, or symmetric emergence without some form of foot point exchange across the heliographic equator, causes poleward migrating fields of both polarities in one or both (respectively) hemispheres which temporarily enhance OSF but do not advance the polar field cycle. The heliospheric field observed near Mercury and Earth reflects the asymmetries in emergence. Using magnetograms, we find evidence that the poleward magnetic flux transport (of both polarities) is modulated by the HCS tilt, revealing an effect on OSF loss rate. The declining phase rise in OSF was caused by strong emergence in the southern hemisphere with an anomalously low HCS tilt. This implies the recent fall in the southern polar field will be sustained and that the peak OSF has limited implications for the polar field at the next sunspot minimum and hence for the amplitude of cycle 25.

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Phase asynchrony of the north-south sunspot activity

Cited by 102 publications

References 12 publications

Long-term asymmetry in the wings of the butterfly diagram

Long-term asymmetry in the wings of the butterfly diagram

Latitudinal Distribution of Sunspots Revisited

Coronal and heliospheric magnetic flux circulation and its relation to open solar flux evolution

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