Izvorni znanstveni članak
Cosmic ray penumbral characteristics at Cairo's latitude
S. A. Wahab
; Physics Department, Faculty of Science, Ain Shams University, Cairo, Egypt
A. M. Salem
; Physics Department, Faculty of Science, Ain Shams University, Cairo, Egypt
Sažetak
The cosmic ray penumbral characteristics at Cairo's latitude (29.6°N, 31.3°E) have been investigated. The computations have been done for vertical and 8-different directions namely 16N, S, E, W and 32N, S, E, W using the trajectory-tracing technique of McCraken et al. The results shows the penumbra width for the directions 16E, 32E, and 32S is equal to zero, while for the others the width varies between 1.32 GV for the direction 16W and 4 GV for the direction 32N. Also, as a result of the penumbra computations, the cutoff rigidities, main cone, stormer, and effective, have been determined. The obtained values indicates that the difference in the effective vertical cutoffs calculated by the 8th degree International Geomagnetic Reference Field (IGRF) model and Finch and Leaton model is approximately equal to zero, over a 20-year interval. The possibility of applying Stormer theory to estimate the non-vertical cutoffs is also investigated.
Ključne riječi
Hrčak ID:
328257
URI
Datum izdavanja:
6.4.1982.
Posjeta: 194 *