MEASUREMENT OF DIURNAL COSMIC-RAY INTENSITY VARIATION AT CALCUTTA WITH A MESON TELESCOPE.
Sonja Alexander, Saibal Chatterjee · IACS Institutional Repository (Indian Association for the Cultivation of Science) · 1970
The djurnal and soim-diurnal variations o f meson intonsity have beon measured at Calcutta (Geographical latitude 22"32'N and longitude 88°20'E at soa-lovel) with a m('8on leloscope.The diurnal variation has an amplitude of 0.13% with the time-maximum at 10.52 hrs I.S T which corresponds to 11 hrs.13 min.local time.Similarly, tho aomidiurnal variation has been found to have an amplitude of 0.06% oorresponding to a time