Accession Number : AD0415385

Title :   EXPERIMENTAL EVIDENCE OF A DIRECTIONAL EVENT DURING THE COSMIC RAY STORIN DECEMBER 1957,

Corporate Author : UPPSALA UNIV (SWEDEN)

Personal Author(s) : Troncoso,Oscar L.

Report Date : MAY 1963

Pagination or Media Count : 1

Abstract : On December 22-24, 1957, a significant cosmic ray increase of short duration took place in the interval between two moderate magnetic storms and during the recovery of a cosmic ray storm. Data were used from 24 cosmic ray stations dis tributed all over the world. The increase was observed only by stations contained within a lim ited region of the earth's surface. The increase, which lasted for about 14 hours, took place at about the same local time for all stations which detected it. The average direction of the arriv ing particles corresponded to 10 hours LT. A second peak, occurring at all stations at about 03 LT, is interpreted as a continuation of the effect generating the first increase. Charac teristic features of both increases are presented together with data of solar and terrestrial ac tivity. There is no clear correlation between the occurrence of these peaks and such activ ities. The modulation mechanism producing the increase, is discussed. (Author)

Descriptors :   (*COSMIC RAYS, MAGNETIC STORMS), MAGNETIC STORMS, GEOMAGNETISM, SUN, SOLAR FLARES, NUCLEONS, MESONS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE