Physics
Scientific paper
Feb 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80..470k&link_type=abstract
Journal of Geophysical Research, vol. 80, Feb. 1, 1975, p. 470-481. Research supported by the Department of Space of India.
Physics
2
Cosmic Rays, Diurnal Variations, Frequency Distribution, Harmonic Analysis, Neutron Flux Density, Amplitudes, Convection, Interplanetary Magnetic Fields, Polar Regions, Spatial Distribution, Tropical Regions
Scientific paper
The amplitude and the hour of maximum of the second harmonic of neutron intensity are studied at Deep River and at Chacaltaya for the period 1965 to 1968. It is found that the amplitude can be significant (more than 0.23%) at each of these locations, but not necessarily at the same time. Contrary to existing models, the direction of the second harmonic is frequently neither field-aligned nor perpendicular to the interplanetary magnetic field. The possibility that the second harmonic amplitude is a parasite of the first harmonic amplitude (because of the limited sinusoidal nature of the space anisotropy) is examined; however, this assumption is found to be only partially justified. Highly diurnal patterns are at times observed both at the equator and at high latitudes, indicating that the semidiurnal component may not be regarded as a permanent feature in any region.
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