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.

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.

scholarly journals Brief communication "On the recent reaffirmation of ULF magnetic earthquakes precursors"

2011 ◽  
Vol 11 (8) ◽  
pp. 2193-2198 ◽  
Author(s):  
F. Masci
Keyword(s):  
Geomagnetic Activity ◽  
Geomagnetic Field ◽  
Earthquake Precursors

Abstract. Hayakawa et al. (2009) and Hayakawa (2011) have recently reviewed some "anomalous" ULF signatures in the geomagnetic field which previous publications have claimed to be earthquake precursors. The motivation of this review is "to offer a further support to the definite presence of those anomalies". Here, these ULF precursors are reviewed once again. This brief communication shows that the reviewed anomalies do not "increase the credibility on the presence of electromagnetic phenomena associated with an earthquake" since these anomalous signals are actually caused by normal geomagnetic activity. Furthermore, some of these ULF precursors have just been rebutted by previous publications.

scholarly journals Temperature Effects on Cosmic Ray muons Observed by Multiwire Detector at High Cutoff Rigidity Station

2019 ◽  
Author(s):  
Abdullrahman Maghrabi ◽  
Abdulah Aldosari ◽  
Mohammed Almutairi ◽  
Mohammed Altilasi ◽  
Abdulah Alshehri ◽  
...  
Keyword(s):  
Temperature Effects ◽  
Cosmic Ray ◽  
Cutoff Rigidity

Cosmic Ray Radiation Effects on Space Environment Associated to Intense Solar and Geomagnetic Activity

2007 ◽  
Vol 54 (4) ◽  
pp. 1089-1096 ◽  
Author(s):  
H. Mavromichalaki ◽  
A. Papaioannou ◽  
G. Mariatos ◽  
M. Papailiou ◽  
A. Belov ◽  
...  
Keyword(s):  
Geomagnetic Activity ◽  
Radiation Effects ◽  
Cosmic Ray ◽  
Space Environment

Dynamics of Cosmic-Ray Cutoff Rigidity and Magnetospheric Parameters during Different Phases of the Storm of November 20, 2003

2021 ◽  
Vol 61 (2) ◽  
pp. 169-179
Author(s):  
N. G. Ptitsyna ◽  
O. A. Danilova ◽  
M. I. Tyasto ◽  
V. E. Sdobnov
Keyword(s):  
Cosmic Ray ◽  
Cutoff Rigidity
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