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Study of anisotropic variation of cosmic rays intensity with solar activity

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DOI: 10.4236/ns.2011.32014    4,809 Downloads   9,322 Views   Citations


The annual average values of amplitudes and phases of first two harmonics of cosmic ray anisotropy have been derived by using the harmonic analysis technique for the period 1989 to 2004, which covers mostly the major period of solar cycles 22 and 23. In this paper we have taken the pressure corrected hourly data for Kiel neutron monitor station (cut off rigidity ≈ 2.29 GV) to derive the harmonic component of cosmic ray daily variation and compared with the data of Halekala neutron monitor (cut off rigidity ≈ 13.2 GV) for the period 1991 to 2004. From the analysis it has been concluded that the diurnal amplitude and phase of daily variation of cosmic rays have been found to be correlated with solar activity. However, the semi-diurnal amplitude and phase are inversely correlated with solar activity for both the stations.

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The authors declare no conflicts of interest.

Cite this paper

Tiwari, C. , Sharma, D. , Tiwari, L. , Saxena, A. and Tiwari, D. (2011) Study of anisotropic variation of cosmic rays intensity with solar activity. Natural Science, 3, 101-103. doi: 10.4236/ns.2011.32014.


[1] Forbush, S.E., (1953) Cosmic ray diurnal anisotropy 1937-1972. Journal of Geophysical Research, 78, 7933- 7941. doi:10.1029/JA078i034p07933
[2] Rao, U.R. (1972) Solar modulation of galactic cosmic radiation. Space Science Reviews, 12, 719-809. doi:10.1007/BF00173071
[3] Agrawal, S.P. and Bercovitch, M. (1983) Long term changes in the cosmic ray diurnal anisotropy. Proceedings of 18th ICRC, Bangalore, 3, 316.
[4] Shrivastavs, P.K. (1990) Study of tri-diurnal anisotropy of cosmic radiation during 1976-1982. Proceedings of 21st International Cosmic Ray Conference, 353-356.
[5] Ahluwalia, H.S. and Wilson, M.D. (1996) Present status of the recovery phase of cosmic ray 11-year modulation. Journal of Geophysical Research (USA), 101, 4879. doi:10.1029/95JA03636
[6] Tiwari, C.M., Tiwari, D.P., Ajay, K.P. and Shriva-Stava, P.K. (2005) Average anisotropy characteristics of high- energy cosmic ray particles and geomagnetic disturbance index Ap. Journal of Astrophysics and Astronomy, 26, 1-6. doi:10.1007/BF02702448
[7] Tiwari, C.M., Tiwari, D.P. and Shrivastava, P.K. (2005) Anomalous behavior of cosmic ray diurnal anisotropy during decending phase of the solar cycle 22. Current Science, 88, 8.
[8] Tiwari, C.M., Tiwari, D.P., Agrawal, S.P. and Shriva- stava, P.K. (2003) Correlative study of various harmonics of the daily variation of Cosmic rays. Ultra Science, 15, 433.
[9] Tiwari, C.M., Tiwari, D.P., Agrawal, S.P. and Shriva- stava, P.K. (2004) Relationship of first two harmonic of cosmic ray daily variation with solar activity. Indian Journal of Radio and Space Physcis, 33, 95.
[10] Ananth, A.G., Agrawal, S.P. and Rao, U.R. (1974) Study of cosmic ray diurnal variation on a day to day basis. Pramana, 3, 74. doi:10.1007/BF02847116
[11] Venkatesan, D and Badruddin, R.S. (1990) Cosmic ray modulation. Space Science Reviews, 52, 121. doi:10.1007/BF00704241
[12] Krimsky, G.F. (1965) Diffusion mechanism of cosmic ray daily variation. Proceedings of 9th International Cosmic Ray Conference, 197-200.
[13] Krimsky, G.F., Krivoshapkis, P.A., Gerasimova, S.K., Grigoryev, V.G., Mamrukova, V.P. and Skripin, G.V. (2003) Variation of high energy cosmic ray anisotropy with a solar activity cycle. 28th International Cosmic Ray Conference, 3985-3988.
[14] Krymsky, G.F., Krivoshapkin, P.A., Gerasimova, S.K. Grisoryev, V.A., Mamrukova, G.P. and Skripin, G.V. (2003) Semi-diurnal variation of galactic cosmic rays. 28th International Cosmic Ray Conference, pp. 3989- 3992.
[15] Belov, A.V., Eroshenko, E.A., Oleneva, V.A., Yanke, V.G. and Mavromichalki, H. (2006) Long-term behaviour of the cosmic ray anisotropy derived from the worldwide Neutron Monitor Network Data. Proceedings of 20th ECRS.

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