A WORLD-WIDE STUDY OF THE DAILY VARIATION OF THE NUCLEONIC COMPONENT OF COSMIC RAYS
The semidiurnal component of the nucleonic intensity at Otthwa, Canada, is essentially a pressure effect for the 5year period, 1955 to 1959. The diurnal variation is composed of the component due to pressure, and a component that may be attributed to an anisotropy of the primary cosmic-ray particles. The results are confirmed by a comparative study of the data from 15 stations between the geomagnetic latitudes 83 deg N and 73 deg S. A world-wide barometric coefficient of -0.72% per mb was obtained from the semidiurnal component and this coefficient was used to correct the diurual component at all the stations. The average corrected diurnal variation during the period of study common to all stations, August 1957 to October 1958, is 0.27% and occurs at 14 hr 16 ruin solar time. There is considerable spread in both amplitude and phase angle among the various sthtions. The root mean square differences from the mean amplitude is plus or minus 0.05% and from the mean phase angle is plus or minus 10 deg (40 minutes in time). The difficulty of drawing definite conclusions about the anisotropy from short-term studies of individual stations is pointed out. (auth)
- Research Organization:
- National Research Council, Ottawa
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-14-023460
- OSTI ID:
- 4148366
- Journal Information:
- Canadian Journal of Physics (Canada), Vol. Vol: 38; Other Information: Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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