Diurnal variations of cosmic ray geomagnetic cut-off threshold rigidities

Details Diurnal variations of cosmic ray geomagnetic cut-off threshold rigidities Diurnal variations of cosmic ray geomagnetic cut-off threshold rigidities

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....5..359d&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 5 p 359-362 (SEE N85-34991 23-93)

Physics

Cosmic Rays, Diurnal Variations, Flux Density, Geomagnetism, Radiance, Earth Magnetosphere, Flux (Rate), Magnetic Fields, Radiation Measuring Instruments, Spectrographs

Scientific paper

The spectrographic global survey method was used to investigate the rigidity variations Rc of geomagnetic cut-off as a function of local time and the level of geomagnetic disturbance for a number of stations of the world wide network. It is shown that geomagnetic cut-off threshold rigidities undergo diurnal variations. The diurnal wave amplitude decreases with increasing threshold rigidity Rc, and the wave maximum occurs at 2 to 4 hr LT. The amplitude of diurnal variations increases with increasing geomagnetic activity. The results agree with those from trajectory calculations made for an asymmetric model of the magnetosphere during different geomagnetic disturbance conditions.

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