Spectral Analysis of Solar Variability and their Possible Role on the Global Warming

El‐Borie, M. A.; Shafik, E.; Abdel-Halim, A. A.; El-Monier, Shady Youssri

doi:10.4236/jep.2010.12014

Cited by 11 publications

(6 citation statements)

References 11 publications

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“…But the results were quite contradictory, even when highly statistically significant; both positive and negative correlations have been found between solar activity and climatic parameters [17]. Over a solar cycle, Sun's activity has a dramatic effect on Earth's surface and atmosphere such as the variation in Earth's climate, wh ich may be caused by varying UV and total radiation fro m the Sun [18][19][20] .…”

Section: Introductionmentioning

confidence: 91%

“…On the other hand, there are many other parameters that effect on the global surface temperature upon global temperature changes have also been the concern of researchers [16,17] presented a correlative study of the possible contributions for the two solar and geomagnetic activities components (aa and Kp) , and the sunspot numbers Rz that may be closely associated with the climate, throughout the last 128 years .…”

Section: Introductionmentioning

confidence: 99%

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Solar and Geomagnetic Activity Effects on Global Surface Temperatures

El‐Borie¹,

Abd-Elzaher²,

Shenawy³

2012

AJEE

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It is a clear fact that the Earth's climate has been changing since the pre-industrial era, especially during the last three decades. This change is generally attributed to two main factors: greenhouse gases (GHGs) and solar activ ity changes. However, these factors are not all-independent. Furthermore, contributions of the above-mentioned factors are still d isputed. The aim of th is paper is relation in the longer t ime , between changer of g lobal surface temperature (GST), and solar geomagnetic activ ist represented by sunspot number (Rz) and geomagnetic indices (aa , Kp ), and to what degree they are connected. The geomagnetics aa are more effect ive on global surface temperature than solar activity. Furthermore, the global surface temperature are strongly sensitive to the 21.3-yr, 10.6-yr, and 5.3-yr variations that observed in the considered geomagnetic and sunspot spectra. The present changes in aa geo magnetics may reflect part ially some future changes in the global surface temperatures.

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Solar and Geomagnetic Activity Effects on Global Surface Temperatures

El‐Borie¹,

Abd-Elzaher²,

Shenawy³

2012

AJEE

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“…The ENSO phenomena have shown a huge impact on the Asian monsoon (Cole et al, 1993), Indian monsoon (Chowdary et al, 2006(Chowdary et al, , 2014, as well as globally (Horel and Wallance, 1981;Barnett, 1989;Yasunari, 1985;Nicolson, 1997). In particular, the El Niño, solar, geomagnetic activities are the major affecting forces on the decadal and interdecadal temperature variability on global and regional scales in a direct/indirect way (El-Borie et al, 2010;Gray et al, 2010). Recent studies (Frohlich and Lean, 2004;Steinhilber et al, 2009) indicate the possible influence of solar activity on Earth's temperature/climate on multi-decadal timescales.…”

Section: Introductionmentioning

confidence: 99%

Wavelet analysis of the singular spectral reconstructed time series to study the imprints of solar–ENSO–geomagnetic activity on Indian climate

Sunkara

Tiwari

2016

Nonlin. Processes Geophys.

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Abstract. To study the imprints of the solar-ENSOgeomagnetic activity on the Indian subcontinent, we have applied singular spectral analysis (SSA) and wavelet analysis to the tree-ring temperature variability record from the Western Himalayas. Other data used in the present study are the solar sunspot number (SSN), geomagnetic indices (aa index), and the Southern Oscillation Index (SOI) for the common time period of 1876-2000. Both SSA and wavelet spectral analyses reveal the presence of 5-7-year short-term ENSO variations and the 11-year solar cycle, indicating the possible combined influences of solar-geomagnetic activities and ENSO on the Indian temperature. Another prominent signal corresponding to 33-year periodicity in the tree-ring record suggests the Sun-temperature variability link probably induced by changes in the basic state of the Earth's atmosphere. In order to complement the above findings, we performed a wavelet analysis of SSA reconstructed time series, which agrees well with our earlier results and increases the signalto-noise ratio, thereby showing the strong influence of solargeomagnetic activity and ENSO throughout the entire period. The solar flares are considered responsible for causing the atmospheric circulation patterns. The net effect of solargeomagnetic processes on the temperature record might suggest counteracting influences on shorter (about 5-6-year) and longer (about 11-12-year) timescales. The present analyses suggest that the influence of solar activities on the Indian temperature variability operates in part indirectly through coupling of ENSO on multilateral timescales. The analyses, hence, provide credible evidence of teleconnections of tropical Pacific climatic variability and Indian climate ranging from inter-annual to decadal timescales and also suggest the possible role of exogenic triggering in reorganizing the global Earth-ocean-atmospheric systems.

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“…SST anomalies in the Arabian sea can influence south west monsoon rain fall pattern over Indian subcontinent 7 . Spectral analysis of sea surface temperature (1880-2008) shows a periodicity of 21.3 years 8 and this correlates well with the reversal of solar magnetic field in every 22 years.…”

Section: Introductionmentioning

confidence: 90%

Solar activity related periodicities in sea surface temperature

Jayalekshmi¹,

Prince²

2016

jusps-B

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Sun is a variable star showing a great variety of non-stationary active processes. Such non-stationary and nonequilibrium processes (solar activity) can lead to sporadic acceleration of energetic particles with greatly enhanced flux (solar wind). These processes modify the radiation environment of Earth and cause strong geomagnetic storms through coupling of solar wind and Earth's magnetosphere. This may lead to aurorae and large electric currents that can disrupt communication, power grids and satellite navigation. During active times, Sun's energy output is irregular and highly explosive. Earth's climate is also influenced by solar activity variations. Sea surface temperature is a well known parameter relating to climate change. It can influence air on the near shore atmosphere and its variations can modify Earth's climate in a highly complex way. Present study analyzes sea surface temperature and solar activity variations, in order to find out the presence of solar activity related periodicities in sea surface temperature.Wavelet analysis of global, northern and southern sea surface temperature time series and various solar activity indices were carried out. Major long-term periodicity found common in global, northern and southern sea surface temperature is 17.9 years. Southern hemisphere sea surface temperature variation is shown mainly to follow variations in sunspot activity. However, global sea surface temperature and northern hemisphere sea surface temperature variations are more influenced by asymmetry in the polar magnetic field of the Sun.

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Spectral Analysis of Solar Variability and their Possible Role on the Global Warming

Cited by 11 publications

References 11 publications

Solar and Geomagnetic Activity Effects on Global Surface Temperatures

Solar and Geomagnetic Activity Effects on Global Surface Temperatures

Wavelet analysis of the singular spectral reconstructed time series to study the imprints of solar–ENSO–geomagnetic activity on Indian climate

Solar activity related periodicities in sea surface temperature

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