Relationship between sunspot number and seasonal rainfall over Kerala using wavelet analysis

Thomas, Elizabeth; Abraham, Noble P.

doi:10.1016/j.jastp.2022.105943

Cited by 11 publications

(7 citation statements)

References 73 publications

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“…Thomas et al reported that the periodicity of sunspot numbers and rainfall estimated by Fourier analysis is in agreement with wavelet analysis. The cross-wavelet transform also indicates a distinct 8-12-year correlation between sunspot number and rainfall [73]. In the current study, the rainfall erosivity presents a period of approximately 11 years, indicating that the characteristics of rainfall erosion change in response to the solar magnetic cycle, and a specific relationship exists between solar activities and rainfall erosion.…”

Section: Discussionsupporting

confidence: 52%

Spatial-Temporal Evolution Pattern and Prediction Analysis of Rainfall Erosivity (1950-2020) in the Tibetan Plateau

Zhao¹,

Zhang²,

Guo³

et al. 2023

Pol. J. Environ. Stud.

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Analysing the temporal and spatial changes in regional rainfall erosivity can reveal the formation mechanism and succession process of water and soil loss. This is particularly relevant for ecologically fragile areas, such as the Tibetan Plateau. In this study, a gravity centre model, Hovmoller diagram, wavelet analysis, Mann-Kendall test, Rescale range analysis, and Daniel's trend test were used to analyse the spatial and temporal evolution pattern of rainfall erosivity on the Tibetan Plateau. The study used 0.25° spatial resolution data based on ERA5 correction from 1950-2020, which improved the spatial resolution and extended the time range of rainfall erosivity research on the Tibetan Plateau. The rainfall erosion in the southeast of the Tibetan Plateau was found to be severe and gradually decreased from the southeast to northwest. The average gravity centre of rainfall erosivity migrated from the southeast to the northwest. Regarding the time cycle, the average rainfall erosivity of the Tibetan Plateau changed rapidly each year, with an approximately 11-year cycle. Furthermore, the rainfall erosivity in the Tibetan Plateau showed a weak downward trend, which could continue to decrease in the future. Collectively, these results support regional ecological security and can help prepare prevention and control measures.

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Section: Discussionsupporting

confidence: 52%

Spatial-Temporal Evolution Pattern and Prediction Analysis of Rainfall Erosivity (1950-2020) in the Tibetan Plateau

Zhao¹,

Zhang²,

Guo³

et al. 2023

Pol. J. Environ. Stud.

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“…Wavelet transform is a powerful tool to analyze time-series data collected by a pinpoint in the domain, to study the fluctuations in the frequency domain [42][43][44]. Wavelet analysis is often combined with Fourier analysis [44][45][46][47] to verify the wavelet findings.…”

Section: Wavelet and Fourier Spectral Analysismentioning

confidence: 99%

“…Wavelet analysis is an excellent tool for examining signals with time-varying frequency characteristics. Unlike Fourier analysis [44][45][46][47], the wavelet transform gives a two-dimensional scan of the analyzed signal, while the time coordinate and frequency are independent variables. This representation allows you to explore the properties of signals simultaneously in time and frequency domains.…”

Section: Wavelet and Fourier Spectral Analysismentioning

confidence: 99%

Periodicities in Solar Activity, Solar Radiation and Their Links with Terrestrial Environment

Zharkova¹,

Васильєва²,

Shepherd³

et al. 2023

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Solar magnetic activity is expressed via variations of sunspots and active regions varying on different timescales. The most accepted is an 11-year period supposedly induced by the electromagnetic solar dynamo mechanism. There are also some shorter or longer timescales detected: the biennial cycle (2 -2.7 years), Gleisberg cycle (80 -100 years), and Hallstatt's cycle (2100 -2300 years). Recently, using Principal Component Analysis (PCA) of the observed solar background magnetic field (SBMF), another period of 330 -380 years, or Grand Solar Cycle (GSC), was derived from the summary curve of two eigenvectors of SBMF. In this paper, a spectral analysis of the averaged sunspot numbers, solar irradiance, and the summary curve of eigenvectors of SBMF was carried out using Morlet wavelet and Fourier transforms. We detect a 10.7-year cycle from the sunspots and modulus summary curve of eigenvectors as well a 22-year-cycle and the grand solar cycle of 342 -350-years from the summary curve of eigenvectors. The Gleissberg centennial cycle is only detected on the full set of averaged sunspot numbers for 400 years or by adding a quadruple component to the summary curve of eigenvectors. Another period of 2200 -2300 years is detected in the Holocene data of solar irradiance measured from the abundance of 14 C isotope. This period was also confirmed with the period of about 2000 -2100 years derived from a baseline of the solar background magnetic field, supposedly, caused by the solar inertial motion (SIM) induced by the gravitation of large planets. The implication of these findings for different deposition of solar radiation into the northern and southern hemispheres of the Earth caused by the combined effects of the solar activity and solar inertial motion on the terrestrial atmosphere is also discussed.

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“…The studies by Vinay Kumar et al [16] as well as by Maxim Ogurtsov et al [17] and Potrzeba-Macrina and Zurbenko [18] highlight the future challenges and research directions, emphasizing how regional-scale atmospheric circulation can aid in understanding solarinduced climate variability. Furthermore, Wei Lu et al [19] conducted a study to explore the potential connection between the summer temperature distribution over Eurasian land and solar activity, while Thomas and Abraham [20] focused on investigating the periodicities of rainfall over Kerala, India, and sunspot numbers, and explored the possible associations between these factors.…”

Section: Introductionmentioning

confidence: 99%

Revealing Coupled Periodicities in Sunspot Time Series Using Bispectrum—An Inverse Problem

Tassiopoulou,

Koukiou,

Anastassopoulos

2024

Applied Sciences

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Sunspot daily time series have been available for almost two centuries providing vast and complicated information about the behavior of our star and especially the interaction of the motion of the planets and other possible interstellar phenomena and their effects on the surface of the Sun. The main result obtained from the sunspot time series analysis is the imprint of various periodicities, such as the planets’ orbital periods and the planetary synodic periods on the sunspots signature. A detailed spectrum representation is achieved by means of a periodogram and a virtual extension of the time length segments with zeroed samples for longer representations. Furthermore, the dependence or coupling of these periodicities is explored by means of a bispectrum. We establish the exact interdependencies of the periodic phenomena on the sunspot time series. Specific couplings are explored that are proved to be the key issues for the coupled periodicities on the sunspot time series. In this work, contrary to what has been presented in the literature, all periodic phenomena are limited within the time period of an 11-year cycle as well as the periodicities of the orbits of the planets. The main findings are the observed strong coupling of the Mercury, Venus, and Mars periodicities, as well as synodic periodicities with all other periodicities that appear on the sunspot series. Simultaneously, the rotation of the Sun around itself (25.6 to 33.5 days) provides an extensive coupling of all recorded periodicities. Finally, there is strong evidence of the existence of a quadratic mechanism, which couples all the recorded periodicities, but in such a way that only frequency pairs that sum up to specific periods are coupled. The justification for this kind of coupling is left open to the scientific community.

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Relationship between sunspot number and seasonal rainfall over Kerala using wavelet analysis

Cited by 11 publications

References 73 publications

Spatial-Temporal Evolution Pattern and Prediction Analysis of Rainfall Erosivity (1950-2020) in the Tibetan Plateau

Spatial-Temporal Evolution Pattern and Prediction Analysis of Rainfall Erosivity (1950-2020) in the Tibetan Plateau

Periodicities in Solar Activity, Solar Radiation and Their Links with Terrestrial Environment

Revealing Coupled Periodicities in Sunspot Time Series Using Bispectrum—An Inverse Problem

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