Periodic variations of the cosmic radiation-III. The 27-day variation

Details Periodic variations of the cosmic radiation-III. The 27-day variation Periodic variations of the cosmic radiation-III. The 27-day variation

Jul 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973p%26ss...21.1141m&link_type=abstract

Planetary and Space Science, Volume 21, Issue 7, p. 1141-1150.

Physics

Scientific paper

The relation between the 27-day variation of the cosmic radiation and of the terrestrial horizontal magnetic intensity has been investigated by means of the data recorded from 1957 to 1968. The periods have a correlation of about +0.5. The cosmic radiation is undoubtedly modulated by the Sun. A persistent wave with a periodicity of approximately 27.2 days could be proved from the data of several ion chamber and neutron monitor stations, but not underground (14m w.e.). The frequency of the daily period of the cosmic radiation shows a 27.3 day variation, too. The sum total of the relative sunspot numbers has a period length of 27.4 days. Their connection with the cosmic radiation is discussed.

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