Mathematics – Logic
Scientific paper
May 1954
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1954phrv...94.1031f&link_type=abstract
Physical Review, vol. 94, Issue 4, pp. 1031-1036
Mathematics
Logic
9
Scientific paper
Properties of the 24-hour intensity variations which were established by ion chamber and counter telescope measurements at high primary-particle energies have now been extended to the low-energy portion of the primary spectrum by measurements with high-altitude neutron piles at geomagnetic latitudes 0° and 48°. The observations demonstrate that the peak-to-peak amplitude of the 24-hour variation increases with latitude and, hence, is dependent on primary-particle rigidity. The latitude ratio for the peak-to-peak variation is ~1.4+/-0.2 and the amplitude at 48° is of the order 1 percent. These facts preclude primary neutrons or a general solar dipole field as the origin of this intensity variation. It is shown that although the amplitude of the variation changes from day to day, the amplitudes of the intensity variations of particles at low and at high energy are related. It is further shown that the amplitude on one day persists for only the next 1 or 2 days and that there is not a strong 27-day recurrence tendency. The general features of the changes in peak-to-peak amplitudes of the monthly average 24-hour variations appear in both neutron detectors and in the Freiburg ionization chamber. Arguments based on the experimental observations are presented to exclude meteorological factors, the terrestrial magnetic field variations, and simple geoelectric field accelerations as the origin of the variation. Since it is shown that the particles which produce the 24-hour variation are charged and have their highest intensity near or after noon local time, it does not appear probable that they come from the direction of the sun. Although it is doubtful that this variation is of terrestrial origin, no proof has yet been given that the variation is of extra terrestrial origin.
Firor John W.
Fonger W. H.
Simpson André J.
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