Abstract
DURING February–April 1947, which was a period of pronounced solar activity, we kept, at Lahore, hourly observations of the cosmic-ray intensity during the day-time with the view of studying its possible correlation with changes of magnetic intensity. Cosmic-ray intensity was measured with a triple counting vertical telescope1, the counts per minute being corrected for the pressure and temperature variations obtained from meteorological data. Hourly values of H were obtained from the nearest magnetic observatory at Alibag (Bombay) and are given in terms of gamma (1 Î3 = 10â3 gauss). A plot of the mean day-time values determined for the same hours for cosmic-ray and magnetic intensity showed a marked variation of each, during magnetic storms ; but in general over the period of almost two months the correlation coefficient between I and H shows a slight positive tendency, though we find it to be below the statistically significant level. This might possibly be due to the fact that the magnetic changes and cosmic-ray intensity changes at two widely different stations during magnetically quiet or slightly disturbed days may not be correlated, while the changes during strong storms might be observed simultaneously even at different stations, sometimes all over the world2,3.
This is a preview of subscription content, access via your institution
Access options
Similar content being viewed by others
References
Parkash, Om, and Sarna, H. R., Ind. J. Phys., 22, 19 (1948).
Johnson, T. H., Rev. Mod. Phys., 10, 229 (1938).
Hess, Victor F., Rev. Mod. Phys., 11, 153 (1939).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
SARNA, H., PARKASH, O. Magnetic Storms and Cosmic-Ray Intensity. Nature 164, 588–589 (1949). https://doi.org/10.1038/164588a0
Issue Date:
DOI: https://doi.org/10.1038/164588a0
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.