scholarly journals A STUDY OF VERTICALLY INCIDENT COSMIC-RAY TRAJECTORIES USING SIXTH- DEGREE SIMULATIONS OF THE GEOMAGNETIC FIELD

1965 ◽  
Author(s):  
M. A. Shea ◽  
D. F. Smart ◽  
K. G. McCracken
Keyword(s):  
Geomagnetic Field ◽  
Cosmic Ray ◽  
Ray Trajectories

Students' Calculation of Cosmic Ray Trajectories

1971 ◽  
Vol 39 (1) ◽  
pp. 103-107
Author(s):  
John D. French ◽  
William H. Lamb ◽  
Philip J. Young
Keyword(s):  
Cosmic Ray ◽  
Ray Trajectories

Pulsations of the geomagnetic field associated with variations in cosmic ray intensity during thunderstorms

2011 ◽  
Vol 75 (6) ◽  
pp. 833-836
Author(s):  
K. Kh. Kanonidi ◽  
A. S. Lidvansky ◽  
L. E. Sobisevich ◽  
N. S. Khaerdinov
Keyword(s):  
Geomagnetic Field ◽  
Cosmic Ray ◽  
Cosmic Ray Intensity

A five degree by fifteen degree world grid of trajectory-determined vertical cutoff rigidities

1968 ◽  
Vol 46 (10) ◽  
pp. S1098-S1101 ◽  
Author(s):  
M. A. Shea ◽  
D. F. Smart ◽  
John R. McCall
Keyword(s):  
Geomagnetic Field ◽  
Cosmic Ray ◽  
Smooth Curve ◽  
Order Effects ◽  
Intensity Data ◽  
Cutoff Rigidity ◽  
Threshold Values ◽  
Small Deviations ◽  
Cosmic Ray Intensity ◽  
Penumbral Region

Vertical cutoff rigidities have been calculated for a world grid 5 degrees in latitude and 15 degrees in longitude using the Finch and Leaton sixth-degree simulation of the quiescent geomagnetic field. These calculations utilized the trajectory-tracing procedure at intervals of 0.01 BV throughout the penumbral region to determine an "effective" vertical cutoff rigidity defined by Shea et al. (1965). When experimental cosmic-ray intensity data are plotted using threshold rigidities derived from this grid, greater coherence of these data is found than is obtained using previously published threshold values. However, small deviations from an intuitively pleasing smooth curve indicate we may have reached a limitation in the usefulness of vertical cutoff rigidities, and perhaps second-order effects should be included when using cutoff rigidity as a parameter in the analysis of very precise cosmic-radiation intensity data.

Time variations of directional cosmic ray intensity at low latitudes: I. Comparison of daily variation of the intensity of cosmic rays incident from east and west

1961 ◽  
Vol 263 (1312) ◽  
pp. 101-117 ◽  
Keyword(s):  
Geomagnetic Field ◽  
Daily Variation ◽  
Cosmic Ray ◽  
Local Source ◽  
Cosmic Ray Intensity ◽  
Low Latitudes ◽  
Long Term Changes ◽  
Time Variations ◽  
East And West

A study has been, conducted at Ahmedabad during 1957 and 1958 of the time variations of meson intensity incident from east and west at 45° to the vertical. A characteristic differ­ence of about 6 h in the diurnal time of maximum for the east and west directions is observed to occur on many days and this has been interpreted as signifying an anisotropy of primary radiation caused by a source outside the influence of the geomagnetic field. However, there are many days on which the daily variation has a maximum near noon for both directions. On such days the predominant influence is that of a local source situated within the influence of the geomagnetic field. The local source is associated with geomagnetically disturbed days. Long-term changes in the daily variation are found to be similar for the east, vertical and west directions.

scholarly journals Geomagnetic effects on cosmic ray propagation for different conditions

2011 ◽  
Vol 7 (S286) ◽  
pp. 234-237
Author(s):  
Jimmy J. Masías-Meza ◽  
Xavier Bertou ◽  
Sergio Dasso
Keyword(s):  
Numerical Simulations ◽  
Geomagnetic Activity ◽  
Geomagnetic Field ◽  
Cosmic Ray ◽  
Cutoff Rigidity ◽  
Lower Cutoff

AbstractThe geomagnetic field (Bgeo) sets a lower cutoff rigidity (Rc) to the entry of cosmic particles to Earth which depends on the geomagnetic activity. From numerical simulations of the trajectory of a proton (performed with the MAGCOS code) in the Bgeo, we use backtracking to analyze particles arriving at the Auger Observatory location. We determine the asymptotic trajectories and the values of Rc in different incidence directions. Simulations were done using several models of Bgeo that emulate different geomagnetic conditions.

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