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The paper presents the effect of solar flare index on Antarctic O3depletion. Solar flare index is the actual representative of energy output of any flare event. A calibration curve between solar flare index and relative sunspot number is drawn. (A straight line is obtained and correlation coefficient between two variables is 0.95, n = 27, P < 0.01)). The equation of straight line from least square principle becomes,Solar Flare Index (If)) = 1.0932 * Relative Sunspot Number – 9.4391.From this equation solar flare index for long period is calculated from known values of relative sunspot numbers. O3 concentration of two antarctic Survey Stations, Halley Bay (76°S, 27°W)) and McMurdo (78 °S, 166°E)) are considered for analysis and following results are obtained:(i)) Correlation coefficient between O3 concentration and solar flare index during Antarctic Spring is not so significant.(ii)) It is concluded that dramatic decrease of O3concentration during Antarctic Spring is independent of solar parameters.