Solar Ultraviolet Radiation Variation Relations at the Surface of the Earth and Solar Activity Variations During the 22nd Solar Cycle Declining Phase

Details Solar Ultraviolet Radiation Variation Relations at the Surface of the Earth and Solar Activity Variations During the 22nd Solar Cycle Declining Phase Solar Ultraviolet Radiation Variation Relations at the Surface of the Earth and Solar Activity Variations During the 22nd Solar Cycle Declining Phase

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000lapa....2q.195s&link_type=abstract

Majalah LAPAN, vol. 2, p. 195

Physics

Solar Radiation, Ultraviolet Radiation, Variations, Solar Physics, Earth Surface, Solar Flux, Solar Activity, Regression Analysis, Correlation Coefficients, Irradiance, Solar Cycles

Scientific paper

The research objective is to investigate the influences of solar activity variation to the solar ultraviolet (UV - A and UV - bA) irradiance variation on the earth surface which was observed from LAPAN - Bandung (6,9 S; 107,6 E) from May 1992 to December 1997. By taking the moving average of 12 months of monthly average solar ultraviolet irradiance , it were found that solar UV - B irradiance matched of 12 months moving average of 12 months of solar activity variation (F10,7 cm solar radio flux); the decreasing of solar activity level during the decreasing phase of 22 solar cycle at an average rate of 16,41% per year, following by decreasing amount of solar UV - B irradiance at an average rate 10,54% per year for the time period. In contrast, the decreasing of solar UV - A irradiance, following by increasing of solar UV - A irradiance at an average rate of 7,48% per year for the time period of observation. By using linear regression analysis, it was obtained a positive correlation between the solar flux UV - B irradiance and the F10,7 cm solar radio flux which is represented by: Solar flux UV - B irradiance [Watt/m2] = 0.055 F10,7 cm solar radio flux [SFU] + 0,0778, with the correlation coefficient of 0,80. In contrast, by assumption that solar activity also effects the solar UV - A irradiance, it was obtained a negative correlation between the solar UV - A irradiance and the F10,7 cm solar radio flux which is represented by: Solar flux UV - A irradiance [Watt/m2] = 0.037 F10,7 cm solar radio flux [SFU] + 15,008, with the negative correlation coefficient of -0,80.

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