Abstract
We have bounded the upper cut-off rigidity (Rc) of the cosmic-ray diurnal anisotropy during the period 1968–1995. This period covers almost three solar cycles and includes three epochs of the solar polar field reversals. The diurnal variation observed by two detectors characterized by linearly independent kernels has been inverted in order to estimate the greatest lower bound (GLB) of Rc. We obtain a step function solution for the cosmic-ray anisotropy in free space which vanishes at the GLB of Rc. The greatest lower bound shows a magnetic cycle variation. The highest value of the amplitude of the anisotropy in free space at the GLB have been estimated as well.
Similar content being viewed by others
References
Ahluwalia, H. S. and Dorman, L. I.: 1997, J. Geophys. Res. 102, 17.
Ahluwalia, H. S. and Riker, J. F.: 1987a, Planetary Space Sci. 35, 39.
Ahluwalia, H. S. and Riker, J. F.: 1987b, Planetary Space Sci. 35, 45.
Ahluwalia, H. S. and Sabbah, I.: 1993a, Cosmic-ray diurnal anisotropy for a solar magnetic cycle, Planet Space Sci. 41, 113.
Ahluwalia, H. S. and Sabbah, I.: 1993b, Planetary Space Sci. 41, 105.
Bieber, J. W. and Chen, J.: Astrophys. J. 372, 301.
Dorman, L. I.: 1974, North-Holland, Amsterdam, p. 252.
Fujii, Z. and Ueno, H.: 1990, 21th Int. Cosmic-Ray Conf. 6, 314.
Inoue, A. and Wada, M.: 1983, Asymptotic Directions in 1975, Cosmic-Ray Tables, World Data Center for Cosmic Rays.
Kota, J. and Jokipii, J. R.: 1983, Astrophys. J. 265, 573.
Kudo, S., Mori, S., Swinson, D. B., Yasue, S., and Ryu, J. Y.: 1987, 20th Int. Cosmic-Ray Conf. 4, 140.
Lockwood, J. A. and Webber, W. R.: 1967, J. Geophys. Res. 72, 3395.
Munakata, K., Miyasaka, H., Hall, D. L., Yasue, S., Kato, C., Fujii, Z., Fujimoto, K., and Sakakibara, S.: 1997, 25th Int. Cosmic-Ray Conf. 2, 77.
Murakami, K., Sagisaka, S., Mishima, K. Y., Inoue, A., and Nagashima, K.: 1981, Response Functions for Cosmic-Ray Muon Observed at Various Locations, Rep. 6, Cosmic-Ray Research Laboratory, Nagoya University, Nagoya, Japan.
Potgieter, M. S., Le Roux, J. A., and Burger, R. A.: 1989, J. Geophys. Res. 94, 2323.
Sabbah, I.: 1994, Egyp. J. Phys. 25, 123.
Sabbah, I.: 1998, Solar Phys., submitted.
Sabbah, I. and Potgieter, M. S.: 1995, 24th Int. Cosmic-Ray Conf. 4, 584.
Stephens, G.: 1994, Remote Sensing of the Lower Atmosphere, Oxford Press, New York.
Ueno, H., Fujii, Z., Mori, S., Morishita, I., and Nagashima, K.: 1985, Int. Cosmic-Ray Conf. 5, 147.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Sabbah, I. Inversion of the Cosmic-Ray Solar Diurnal Variations. Solar Physics 186, 413–419 (1999). https://doi.org/10.1023/A:1005185031762
Issue Date:
DOI: https://doi.org/10.1023/A:1005185031762