Measurement of high altitude vertical cosmic ray intensity, at New Delhi, India, 19° North, geomagnetic latitude

Summary

Using the radio-sonde technique, three high altitude balloon flights were made at New Delhi 19° N. (Mag.) to measure the total vertical intensity to heights upto 40,000 feet (200 mb.). It has been found that the intensityvs. pressure curve for the total intensity as reported by other workers is well represented by a third degree polynomial of the log (intensity) against log (pressure). There is good agreement between our three flights when normalised to the same reading at ground level, and our results are well represented by the same polynomial. There is a renewed indication of a hump and a depression in the regions previously reported by Bhabha and co-workers and Gill in their aeroplane ascents, and this cannot be attributed to temperature effect here since the temperature was very well controlled inside the gondola by the ‘green house’ effect.