The hemispheric asynchrony of polar faculae during solar cycles 19–22

Deng, Linhua; Qu, Zhiguo; Liu, T.; Huang, Wenlang

doi:10.1016/j.asr.2012.08.013

Cited by 17 publications

(7 citation statements)

References 57 publications

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“…The XWT and WTC are widely used to analyze the nonlinear behavior and expose common power and relative phase in time-frequency space between the two time series (Grinsted et al 2004;Li 2008;Li et al 2009;Deng et al 2012;Kong et al 2014 (Grinsted et al 2004;Li et al 2009;Deng et al 2013). Cross wavelet power reveals areas with high common power.…”

Section: The Cross Wavelet Transform (Xwt) and Wavelet Coherence (Wtcmentioning

confidence: 99%

What Causes the Inter-Solar-Cycle Variation of Total Solar Irradiance?

Xiang

Kong

2015

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The Physikalisch Meteorologisches Observatorium Davos total solar irradiance (TSI), Active Cavity Radiometer Irradiance Monitoring TSI, and Royal Meteorological Institute of Belgium TSI are three typical TSI composites. Magnetic Plage Strength Index (MPSI) and Mount Wilson Sunspot Index (MWSI) should indicate the weak and strong magnetic field activity on the solar full disk, respectively. Cross-correlation (CC) analysis of MWSI with three TSI composites shows that TSI should be weakly correlated with MWSI, and not be in phase with MWSI at timescales of solar cycles. The wavelet coherence (WTC) and partial wavelet coherence (PWC) of TSI with MWSI indicate that the inter-solar-cycle variation of TSI is also not related to solar strong magnetic field activity, which is represented by MWSI. However, CC analysis of MPSI with three TSI composites indicates that TSI should be moderately correlated and accurately in phase with MPSI at timescales of solar cycles, and that the statisticalsignificancetest indicates that the correlation coefficient of three TSI composites with MPSI is statistically significantly higher than that of three TSI composites with MWSI. Furthermore, the cross wavelet transform (XWT) and WTC of TSI with MPSI show that the TSI is highly related and actually in phase with MPSI at a timescale of a solar cycle as well. Consequently, the CC analysis, XWT, and WTC indicate that the solar weak magnetic activity on the full disk, which is represented by MPSI, dominates the inter-solar-cycle variation of TSI.

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Section: The Cross Wavelet Transform (Xwt) and Wavelet Coherence (Wtcmentioning

confidence: 99%

What Causes the Inter-Solar-Cycle Variation of Total Solar Irradiance?

Xiang

Kong

2015

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“…Moreover, it brings about hemispheric asymmetry of solar activities from recent studies. Therefore, interest in N-S asynchrony of solar activity in the two hemispheres has grown considerably [5]- [6].…”

Section: Introductionmentioning

confidence: 99%

An investigation of north-south asynchrony of solar filament activity: Wavelet transform analyses

Yu¹,

Deng

Feng

2013

2013 IEEE Third International Conference on Information Science and Technology (ICIST)

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Monthly counts of filament numbers in the time interval of 1954 April to 2010 June are proposed to determine their phase asynchrony between the solar northern and southern hemispheres by using advanced wavelet transforms. Both the cross-wavelet transform and wavelet coherence analyses show asynchronous behaviour with strong phase mixing in the highfrequency components of hemispheric flare activity, and strong synchronous behaviour with coherent phase angles in the lowfrequency components, corresponding to the period-scales around the 11-year Schwabe cycle. This study shows that the wavelet transforms techniques for the hemispheric phase analysis of solar time series is fairly useful.

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“…Polar faculae, considered as the main index of solar activity at high latitudes, are anti-correlated with low-latitude solar activity (Deng et al, 2013a). They vary with the period about 11-year Schwabe cycle, which is well known from solar activity at low latitudes, and they take part in the magnetic activity cycle, with a shift by 5-6 years with respect to the sunspot activity (Deng et al, 2013b).…”

Section: Introductionmentioning

confidence: 99%