Solar Influence on the Anisotropy of Primary Cosmic Radiation. I. Studies at Low Latitudes

Details Solar Influence on the Anisotropy of Primary Cosmic Radiation. I. Studies at Low Latitudes Solar Influence on the Anisotropy of Primary Cosmic Radiation. I. Studies at Low Latitudes

Sep 1955

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1955phrv...99.1490s&link_type=abstract

Physical Review, vol. 99, Issue 5, pp. 1490-1502

Physics

1

Scientific paper

A study of the daily variation of meson intensity at low latitudes has been conducted with counter telescopes of identical design at Ahmedabad and at the mountain station of Kodaikanal. The analysis of the data shows that the semidiurnal component of variation, like the diurnal component, undergoes significant long-term changes. The appropriateness of a barometric coefficient applicable to the daily variation of meson intensity is discussed. Long-term changes of the daily variation reveal that these are due to the addition or attenuation of a day and a night contribution, both of which are principally diurnal in character and at Ahmedabad have maxima at about 1300 and 0300 hours, respectively. For corroboration of these findings, data from 1937 to 1952, from the Carnegie Institution stations of Huancayo and Cheltenham have been analyzed. While at the equatorial station of Huancayo, the mechanism of change of daily variation is similar to what is observed at Ahmedabad and Kodaikanal, there are some differences in detail at Cheltenham, which lies in middle latitudes. There is evidence that some characteristics of the daily variation, notably the hour of maximum of the diurnal component and the amplitude of the semidiurnal component, follow the eleven-year solar cycle of activity. However, there is an indication that the nature of the composite daily variation, the hour of maximum of the semidiurnal component, and the pattern of addition and attenuation of the day and night contributions follow a 22-year cycle of change. The activity of the day and night contributions in relation to solar activity is discussed.

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