scholarly journals Vertical Geomagnetic Cutoff Rigidities for Epoch 2015

2020 ◽  
Author(s):  
Don Smart ◽  
Margaret A. Shea
Keyword(s):  
Geomagnetic Cutoff

Trajectory reconstruction in the Earth Magnetosphere using TS05 model and evaluation of geomagnetic cutoff in AMS-02 data

2016 ◽  
Author(s):  
Davide Grandi ◽  
Bruna Bertucci ◽  
Matteo Boschini ◽  
Stefano Della torre ◽  
Matteo Duranti ◽  
...  
Keyword(s):  
Trajectory Reconstruction ◽  
The Earth ◽  
Geomagnetic Cutoff

scholarly journals Calculating the ionization rate induced by GCR and SCR protons in Earth’s atmosphere

2019 ◽  
Vol 5 (3) ◽  
pp. 68-74
Author(s):  
Евгений Маурчев ◽  
Evgeniy Maurchev ◽  
Юрий Балабин ◽  
Yuriy Balabin ◽  
Алексей Германенко ◽  
...  
Keyword(s):  
Primary Particle ◽  
Cosmic Ray ◽  
Ground Level ◽  
Ionization Rate ◽  
Future Research ◽  
Energy Distributions ◽  
Earth’S Atmosphere ◽  
Geomagnetic Cutoff Rigidity ◽  
Geomagnetic Cutoff ◽  
Earth's Atmosphere

This paper explores the applied use of the RUSCOSMICS software package [http://ruscosmics.ru] designed to simulate propagation of primary cosmic ray (CR) particles through Earth’s atmosphere and collect information about characteristics of their secondary component. We report the results obtained for proton fluxes with energy distributions corresponding to the differential spectra of galactic CR (GCR) and solar CR (SCR) during ground level enhancement (GLE) events GLE65 and GLE67. We examine features of the geometry of Earth’s atmosphere, parametrization methods, and describe a primary particle generator. The typical energy spectra of electrons obtained both for GCR and for GLE65 provide information that allows us to quantitatively estimate the SCR contribution to the enhancement of secondary CR fluxes. We also present altitude dependences of ionization rate for GCR and both the GLE events for several geomagnetic cutoff rigidity values. The conclusion summarizes and discusses the prospects for future research.

scholarly journals The geomagnetic cutoff rigidities at high latitudes for different solar wind and geomagnetic conditions

2016 ◽  
Vol 34 (1) ◽  
pp. 45-53 ◽  
Author(s):  
W. Chu ◽  
G. Qin
Keyword(s):  
Solar Wind ◽  
Cosmic Rays ◽  
Strong Correlation ◽  
Geomagnetic Storms ◽  
Dynamic Pressure ◽  
Threshold Value ◽  
High Latitudes ◽  
Dst Index ◽  
Ae Index ◽  
Geomagnetic Cutoff

Abstract. Studying the access of the cosmic rays (CRs) into the magnetosphere is important to understand the coupling between the magnetosphere and the solar wind. In this paper we numerically studied CRs' magnetospheric access with vertical geomagnetic cutoff rigidities using the method proposed by Smart and Shea (1999). By the study of CRs' vertical geomagnetic cutoff rigidities at high latitudes we obtain the CRs' window (CRW) whose boundary is determined when the vertical geomagnetic cutoff rigidities drop to a value lower than a threshold value. Furthermore, we studied the area of CRWs and found out they are sensitive to different parameters, such as the z component of interplanetary magnetic field (IMF), the solar wind dynamic pressure, AE index, and Dst index. It was found that both the AE index and Dst index have a strong correlation with the area of CRWs during strong geomagnetic storms. However, during the medium storms, only AE index has a strong correlation with the area of CRWs, while Dst index has a much weaker correlation with the area of CRWs. This result on the CRW can be used for forecasting the variation of the cosmic rays during the geomagnetic storms.

SOME FEATURES OF THE RESPONSE OF NEUTRON MONITORS TO LOW-ENERGY PARTICLES INCIDENT ON THE TOP OF THE ATMOSPHERE

1962 ◽  
Vol 40 (7) ◽  
pp. 906-923 ◽  
Author(s):  
William Webber
Keyword(s):  
Solar Flare ◽  
Sea Level ◽  
Ring Current ◽  
Internal Field ◽  
Low Energy ◽  
Intensity Increase ◽  
Neutron Monitors ◽  
Solar Particle Events ◽  
Yield Functions ◽  
Geomagnetic Cutoff

By comparing the measured intensities and spectra of solar particles at the top of the atmosphere with measured neutron monitor intensity increases at sea level for several solar particle events, a set of yield functions has been derived for these neutron monitors in terms of low-rigidity (0.5–2 BV) particles incident on the top of the atmosphere. The monitors are found to be significantly more sensitive to these low-rigidity particles than has recently been believed. Various characteristics of the response of neutron monitors to solar flare particles are discussed. In particular a method is described by which the intensity increase vs. latitude curve for the neutron monitors during these events can be utilized to derive a measurement of the deviations in geomagnetic cutoff from those expected from the earth's internal field only. Applying this to the November 15, 1960, event suggests that a ring current of moment M = 0.6 ME and radius R = 7.7 RE was flowing at 1130 U.T. on this day.

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