Role of coronal index of solar activity in long-term cosmic ray modulation

87-90The relationship between cosmic rays and coronal index of solar activity (CI) for the periods of negative (A 0) polarities of the general magnetic field of sun has been analysed. In cosmic ray modulation, sunspot numbers are being generally used as a reliable solar parameter. In this analysis, coronal index has been used as a new solar parameter for long-term cosmic ray modulation. Negative and high correlations are found between CI and cosmic rays for the A > 0 epochs and A 0 and A < 0 epochs of solar magnetic field. Correlations are found to be poor during the mixed polarity years