DIURNAL VARIATION OF COSMIC RAY ELECTRONS

The cosmic ray electron intensity between 30 MeV and 1500 MeV has been measured with a system composed of a Cerenkov telescope and a lead-scintillator sandwich detector. Results are presented from a balloon flight made at Kiruna, Northern Sweden, in 1967. The electron measurements were made between 3.7 and 4.5g cm-2 residual atmosphere from local midnight until after local noon. The results show that at energies between 30 MeV and 900 MeV the durnal variation is 0 ± 25 per cent. This is compared with other results from Fort Churchill, Canada and with satellite observations. © 1969.