Correlation of Solar Ultraviolet Radiation on the Earth's Surface and Solar Activity Variation During Solar Cycle 22 Decreasing Phase

Details Correlation of Solar Ultraviolet Radiation on the Earth's Surface and Solar Activity Variation During Solar Cycle 22 Decreasing Phase Correlation of Solar Ultraviolet Radiation on the Earth's Surface and Solar Activity Variation During Solar Cycle 22 Decreasing Phase

Oct 2000

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

Majalah LAPAN, vol. 2, p. 195

Physics

Solar Radiation, Solar Activity, Correlation Coefficients, Regression Analysis, Solar Flux, Solar Cycles, Earth Surface, Light (Visible Radiation)

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 deg S; 107,6 deg E) from Mei 1992 and 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 22th 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 irradiation, 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/sq m) = 0.055 Fl0,7 cm solar radio flux [SFU]+ 0,0778, with the correlation coefficient of 0,80. In contrast, by assurance 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/sq m2) = 0.037 F10,7 cm solar radio flux (SFU) + 15,008, with the negative correlation coefficient of - 0,80.

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