Solar and Geomagnetic Activity Effects on Global Surface Temperatures

El‐Borie, M. A.; Abd-Elzaher, Mohamed; Shenawy, A. Al

doi:10.5923/j.ajee.20120204.02

Cited by 8 publications

(4 citation statements)

References 26 publications

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“…Similar periodicities were observed in the spectral of solar indices and rainfall. Other authors such as [16], [17], [18] have obtained similar periodicities between solar indices and climatic parameters. It has been reported that solar activity varies between active and quiet phases with 11 year solar cycle known as Schwabe cycle, 22 year polarity reversals called Hale cycle and 80 year cycle known as Gleissberg cycle [19], [20].…”

Section: Resultssupporting

confidence: 55%

Seasonal Variability of Rainfall and its Decadal Anomaly over Nigeria: Possible Role of Solar and Geomagnetic Activities

Owoicho¹,

Nneka²

2018

IJAERS

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This study investigates seasonal variations of rainfall and its decadal anomaly over Nigeria and the possible role of solar and geomagnetic activities. Sunspot number and geomagnetic aa index were used as solar indices. Monthly mean rainfall data from Nigeria Meteorological Agency was used in this study. Bivariate and power spectral density analyses were employed in analyzing the data. Rainfall anomaly was calculated using the mean of the base period, 1981 -2010. Seasonally, rainfall varies from the coastal areas to the hinterland from January to December during rainy and dry seasons. On the decadal rainfall anomaly, positive anomalies increases steadily towards the coastal regions; indicating an increase in rainfall characteristic, whereas negative anomalies increases towards the northern regions; depicting decrease in rainfall characteristic. This was confirmed from the Mann-Kendall trend test. These variations are evidence of climate change. Correlation analysis revealed that the correlation of rainfall with sunspot and aa index were statistically insignificant. The spectral analysis revealed signatures of solar and geomagnetic activities on the rainfall spectrum. We therefore infer that, in addition to anthropogenic activities, solar and geomagnetic activities might play important role in the observed climate change in Nigeria; since rainfall is used as climate change indicator.

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Section: Resultssupporting

confidence: 55%

Seasonal Variability of Rainfall and its Decadal Anomaly over Nigeria: Possible Role of Solar and Geomagnetic Activities

Owoicho¹,

Nneka²

2018

IJAERS

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“…Also, signatures of solar activity effects were reported on variations of climatic parameters (e.g. [9][10][11][12][13][14][15]). However, the physical mechanism for these relationships has been the major challenge [16].…”

Section: Introductionmentioning

confidence: 99%

Investigation of possible connections between solar activity and climate change in Nigeria

Audu

Okeke

2019

SN Appl. Sci.

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Over the years, several attempts were made to establish the possible link by which solar activity influenced climate change. However, the physical mechanism for these relationships has been the major challenge. In this research, we investigate the relationship between solar/geomagnetic activity and cosmic rays, the connection between cosmic rays and cloud covers and finally, cloud covers and climatic parameters. This is the proposed physical mechanism used in this study to investigate how solar activity influenced climate change in Nigeria. Sunspot number, aa index, galactic cosmic rays (GCRs), rainfall and maximum temperature data were used in this study. The time period under investigation in this study spanned for 63 years (1950-2012). Spearman's rank correlation technique was employed in analyzing the data. Results reveal that sunspot number and aa index varied in the opposite direction with GCRs based on the 11-year solar cycle. This inverse relationship was confirmed from the correlation analysis. This depicts that solar and geomagnetic activities modulate cosmic rays penetrating into the Earth's atmosphere. Furthermore, the relationship between cosmic rays and cloud covers is yet to be fully ascertained in this study. This has limited the proposed physical mechanism that this study hoped to establish. However, the variations of cloud covers with rainfall and temperature show that changes in cloud covers are associated with changes in rainfall and temperature. This study has given useful information on the possible links by which solar activity could influence climate change.

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“…The results of El-Borie et al (2012b) show that 40 -50% of the increase in global solar temperature was due to solar forcing. Also, El-Borie et al (2012a) revealed that solar variability parameters play an important role in climate change and cannot be excluded from the responsibility of continuous global warming.…”

Section: Introductionmentioning

confidence: 93%

Influence of solar and geomagnetic activity on climate change in Nigeria

Okeke¹,

Audu²

2017

Int. J. Phys. Sci.

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This study investigates the possible effects of solar and geomagnetic activity on climatic parameters in Nigeria. Data of sunspot number and geomagnetic aa index from 1950 -2012 and 1950 -2010 were used as solar indices respectively. Monthly mean daily rainfall, minimum and maximum temperature data from 1950 -2012 for 15 stations were used as climatic parameters. Descriptive and bivariate analyses as well as Mann-Kendall trend test were employed in analyzing the data, while power spectral density (PSD) analysis was performed using XLSTAT. The results reveal significant upward trends in the variability of minimum and maximum temperature, whereas no significant trends were observed in the variation trend of rainfall for the period under study. This was ascertained from the Mann-Kendall trend test. The variability in rainfall and temperature could be evidence of climate change. The correlation between solar indices and climatic parameters were statistically insignificant at 0.05 level of significant. Similar periodicities were observed in the spectrum of solar and geomagnetic activity indices, as well as the climatic parameters. There were indications of Schwabe, Hale and Gleissberg cycles on rainfall and temperature spectral. These depict signatures of solar and geomagnetic activities. Hence, we infer that, apart from human activities, solar and geomagnetic activities could play important roles in climate change observed in Nigeria.

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Solar and Geomagnetic Activity Effects on Global Surface Temperatures

Cited by 8 publications

References 26 publications

Seasonal Variability of Rainfall and its Decadal Anomaly over Nigeria: Possible Role of Solar and Geomagnetic Activities

Seasonal Variability of Rainfall and its Decadal Anomaly over Nigeria: Possible Role of Solar and Geomagnetic Activities

Investigation of possible connections between solar activity and climate change in Nigeria

Influence of solar and geomagnetic activity on climate change in Nigeria

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