Abstract
A correlative analysis has been made between cosmic ray intensity and solar activity (sunspot numbers) during high amplitude days for the period 1991–1995. The high amplitude days with the time of maximum in the corotational/azimuthal direction do not indicate any significant correlation with solar activity. The diurnal amplitude significantly remains constant and high (0.5%) during the entire period. Our observations suggest that the direction of the anisotropy of high amplitude anisotropic wave train events contribute significantly to the short-term behavior of the cosmic ray diurnal anisotropy. The correlation coefficient is found to remain positive during solar activity maximum for all the high amplitude anisotropic wave train events.
References
Legrand, J.P. and Simon, P.A., Some Solar Cycle Phenomena Related to the Geomagnetic Activity from 1868 to 1980: I. The Shock Events, or the Interplanetary Expansion of the Toroidal Field, Astron. Astrophys., 1985, vol. 152, p. 199.
Xanthakis, J., Mavromichalaki, H., and Petropoulos, B., Cosmic-Ray Intensity Related to Solar and Terrestrial Activity Indices in Solar Cycle no. 20, Astrophys. Space Sci., 1981, vol. 74, p. 303.
Agrawal, S.P. and Bercovitch, M., Study of 11 and 22 Year Periodic Variation of Cosmic Ray Diurnal Anisotropy, Proc. 18th Intern. Cosmic Ray Conf., 1983, vol. 3, p. 316.
Swinson, D.B., Shea, M.A., and Humble, J.E., Cosmic Ray Density Gradients Related to North-South Asymmetry in Activity on the Sun, J. Geophys. Res., 1986, vol. 91, p. 2943.
Riker, J.F. and Ahluwalia, H.S., A Survey of the Cosmic Ray Diurnal Variation during 1973–1979. II. Application of Diffusion-Convection Model to Diurnal Anisotropy Data, Planet. Space Sci., 1987, vol. 35, p. 1117.
Krivsky, L., Solar Proton Flares and Their Prediction, Proc. 15th Intern. Cosmic Ray Conf., Plovdiv, 1977, vol. 4, p. 15.
Hatton, C.J., Solar Flares and the Cosmic Ray Intensity, Solar Phys., 1980, vol. 66, p. 159.
Nagashima, K. and Morishita, I., Long Term Modulation of Cosmic Rays and Inferable Electromagnetic State in Solar Modulating Region, Planet. Space Sci., 1980, vol. 28, p. 177.
Mavromichalaki, H. and Petropoulos, B., Time-Lag of Cosmic-Ray Intensity, Astrophys. Space Sci., 1984, vol. 106, p. 61.
Kumar, Santosh Gulati, U., and Kbare, D., Diurnal Variation of Galactic Cosmic Ray Intensity on Quiet Days Till Recent Period, Proc. 21st Intern. Cosmic Ray Conf., Adelaide, 1990, vol. 6, p. 330.
Ananth, A.G., Venkatesan, D., and Pillai, Suresh,, Long-Term Changes in the Cosmic-Ray Diurnal Anisotropy, Solar Phys., 1993, vol. 143, p. 187.
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © R.K. Mishra, R.A. Mishra, 2008, published in Kosmicheskie Issledovaniya, 2008, Vol. 46, No. 1, pp. 94–96.
This article was sumitted by the author in English.
Rights and permissions
About this article
Cite this article
Mishra, R.K., Mishra, R.A. Short-term variation of cosmic ray diurnal anisotropy and solar activity. Cosmic Res 46, 94–96 (2008). https://doi.org/10.1134/S0010952508010115
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0010952508010115