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Venkatesan, D. (2011)
Publisher: Co-Action Publishing
Journal: Tellus A
Languages: English
Types: Article
The 27-day recurrence tendency in the cosmic ray intensity has been studied by the Chree method of analysis for the period 1937-55, using the ionisation chamber records at Huancayo. The amplitude of the 27-day variation changes from year to year. The variation in the amplitude is in general agreement with the changes in solar activity as revealed by the sun-spot number only for the years 1937-46 and 1952-55. This is in agreement with the results of Meyer and Simpson for the same periods, obtained from a slightly different method of analysis. The correlation breaks down for the period 1946-52 and this is discussed in terms of possible changes in the electromagnetic conditions in the interplanetary space during the solar cycle.DOI: 10.1111/j.2153-3490.1958.tb01992.x
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    • 5. GALLI, M., and GALLI, A. M., 1956: On the 27-day Recurrence trains of Forbush type minima in the Cosmic Ray Intensity. Private Communication.
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    • 8. MEYER, P., and SIMPSON, J. A., 1954: Changes in Amplitude of the Cosmic Ray 27-day Intensity Variation with solar activity. Phys. Reu., 96, p. 1085ยท
    • 9. MONK, A. T., and COMPTON, A. H., 1939: Rev. of Mod. Phys., II, p. 175.
    • 10. SIMPSON, J. A., 1954: Cosmic Radiation Intensity Time Variations and their origin III. Phys. Rev., 9., p. 426.
    • II. SIMPSON, J. A., FONGER, W., and WILCOX, 1., 1952: A Solar component of the Primary Cosmic Radiation. Phys. Rev., 85, p. 366.
    • 12. SINGER, S. F., 1956: The Primary Cosmic Radiation and its Time Variations. Maryland University Physics Department Technical Report 40.
    • 13. VENKATESAN, D., 1957: Magnetic Storm Effects and the Interplanetary Electromagnetic State. Tel/us,
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