Time Variations of Directional Cosmic Ray Intensity at Low Latitudes. II. Time Variations of East-West Asymmetry

Journal Article · Tue Aug 22 04:00:00 EDT 1961 · Proceedings of the Royal Society. A. Mathematical, Physical and Engineering Sciences

DOI:https://doi.org/10.1098/rspa.1961.0150· OSTI ID:4842146

Rao, U. R.; Sarabhai, V.

Changes of the energy spectrum of primary cosmic radiation are followed through the time variations of east-west asymmetry of the mu meson component at low latitudes. Such a study was conducted for the first time at Ahmedabad during 1957--8. The changes of east-west asymmetry are associated with changes of the daily variation of cosmic ray intensity, of the daily mean neutron intensity measured at equatorial and middle latitude stations, of the index of geomagnetic disturbance and of the horizontal component of the earth's magnetic field. The study indicates that days with high east-west asymmetry are associated with geomagnetically quiet days and a cosmic ray daily variation consistent with its being produced by an anisotropy of primary radiation outside the influence of the geomagnetic field. On such days, the daily variation produced by the anisotropy, as observed at an equatorial station, has a significant diurnal as well as a semi- diurnal component. High east-west asymmetry and associated anisotropy occur 3 to 5 days before the arrival of solar corpuscular beams which envelop the earth. Days with low east-west asymmetry occur about 3 to 4 days after the onset of cosmic ray storms associated with geomagnetic storms, usually of the SC type.

• Research Organization: Physical Research Lab., Ahmedabad, India
• Sponsoring Organization: USDOE
• NSA Number: NSA-15-029875
• OSTI ID: 4842146
• Journal Information: Proceedings of the Royal Society. A. Mathematical, Physical and Engineering Sciences, Journal Name: Proceedings of the Royal Society. A. Mathematical, Physical and Engineering Sciences Journal Issue: 1312 Vol. 263; ISSN 1364-5021
• Publisher: The Royal Society Publishing
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
ANISOTROPY
COSMIC RADIATION
DISTRIBUTION
DIURNAL VARIATION
EARTH
EAST-WEST ASYMMETRY
ENERGY
GEOMAGNETIC COORDINATES
MAGNETIC FIELDS
MAGNETIC STORMS
MEASURED VALUES
MUONS
NEUTRONS
PHYSICS
PRIMARY COSMIC RADIATION
PRODUCTION
SUN
TURBULENCE
VARIATIONS