scholarly journals Application of the verified neutron monitor yield function for an extended analysis of the ground level enhancement GLE # 71 on May 17, 2012

Space Weather ◽  
2020 ◽  
Author(s):  
A. L. Mishev ◽  
S. A. Koldobskiy ◽  
I. G. Usoskin ◽  
L. G. Kocharov ◽  
G. A. Kovaltsov
Keyword(s):  
Neutron Monitor ◽  
Ground Level ◽  
Yield Function ◽  
Ground Level Enhancement ◽  
Extended Analysis

scholarly journals GLE # 67 Event on 2 November 2003: An Analysis of the Spectral and Anisotropy Characteristics Using Verified Yield Function and Detrended Neutron Monitor Data

Solar Physics ◽  
2021 ◽  
Vol 296 (5) ◽  
Author(s):  
Alexander L. Mishev ◽  
Sergey A. Koldobskiy ◽  
Leon G. Kocharov ◽  
Ilya G. Usoskin
Keyword(s):  
Neutron Monitor ◽  
Dynamical Evolution ◽  
Ground Level ◽  
High Energy ◽  
Yield Function ◽  
Angle Distribution ◽  
Ground Level Enhancement ◽  
Solar Particles ◽  
Monitor Data

AbstractDuring Solar Cycle 23 16 ground-level enhancement events were registered by the global neutron monitor network. In this work we focus on the period with increased solar activity during late October – early November 2003 producing a sequence of three events, specifically on ground-level enhancement GLE 67 on 2 November 2003. On the basis of an analysis of neutron monitor and space-borne data we derived the spectra and pitch-angle distribution of high-energy solar particles with their dynamical evolution throughout the event. According to our analysis, the best fit of the spectral and angular properties of solar particles was obtained by a modified power-law rigidity spectrum and a double Gaussian, respectively. The derived angular distribution is consistent with the observations where an early count rate increase at Oulu neutron monitor with asymptotic viewing direction in the anti-Sun direction was registered. The quality of the fit and model constraints were assessed by a forward modeling. The event integrated particle fluence was derived using two different methods. The derived results are briefly discussed.

An extended analysis of the September 1989 cosmic ray ground level enhancement

1998 ◽  
Vol 103 (A10) ◽  
pp. 23733-23742 ◽  
Author(s):  
J. L. Lovell ◽  
M. L. Duldig ◽  
J. E. Humble
Keyword(s):  
Cosmic Ray ◽  
Ground Level ◽  
Ground Level Enhancement ◽  
Extended Analysis

Optimizing the real-time ground level enhancement alert system based on neutron monitor measurements: IntroducingGLE Alert Plus

Space Weather ◽  
2014 ◽  
Vol 12 (11) ◽  
pp. 633-649 ◽  
Author(s):  
G. Souvatzoglou ◽  
A. Papaioannou ◽  
H. Mavromichalaki ◽  
J. Dimitroulakos ◽  
C. Sarlanis
Keyword(s):  
Real Time ◽  
Neutron Monitor ◽  
Ground Level ◽  
Alert System ◽  
Ground Level Enhancement ◽  
The Real

scholarly journals Development of a ground level enhancement alarm system based upon neutron monitors

Space Weather ◽  
2006 ◽  
Vol 4 (10) ◽  
pp. n/a-n/a ◽  
Author(s):  
T. Kuwabara ◽  
J. W. Bieber ◽  
J. Clem ◽  
P. Evenson ◽  
R. Pyle
Keyword(s):  
Ground Level ◽  
Alarm System ◽  
Neutron Monitors ◽  
Ground Level Enhancement

scholarly journals Application of the verified neutron monitor yield function for GLE analysis

2021 ◽  
Author(s):  
Aleksandar Mishev ◽  
Ilya Usoskin ◽  
Sergey Koldobskiy ◽  
Gennady Kovaltsov ◽  
Leon Kocharov
Keyword(s):  
Neutron Monitor ◽  
Yield Function

scholarly journals Ionization effect of solar particle GLE events in low and middle atmosphere

2010 ◽  
Vol 10 (12) ◽  
pp. 30381-30404 ◽  
Author(s):  
I. G. Usoskin ◽  
G. A. Kovaltsov ◽  
I. A. Mironova ◽  
A. J. Tylka ◽  
W. F. Dietrich
Keyword(s):  
Middle Atmosphere ◽  
Ground Level ◽  
Solar Proton ◽  
Energy Spectra ◽  
Wide Energy Range ◽  
Ground Level Enhancement ◽  
Direct Ionization ◽  
Ionization Effect ◽  
The World ◽  
Wide Energy

Abstract. Using a new reconstruction of the solar proton energy spectra for Ground Level Enhancement (GLE) events, based on fits to measurements from ground-based and satellite-borne instruments covering a wide energy range, we quantitatively evaluate the possible ionization effects in the low and middle atmosphere for 58 out of the 66 GLE events recorded by the world-wide neutron monitor network since 1956. The ionization computations are based on the numerical 3-D CRAC:CRII model. A table of the ionization effect caused by the GLE events at different atmospheric heights is provided. It is shown that the direct ionization effect is negligible or even negative, due to the accompanying Forbush decreases, in all low- and mid-latitude regions. The ionization effect is important only in the polar atmosphere, where it can be dramatic in the middle and upper atmosphere (above 30 km) during major GLE events.

scholarly journals Neutron monitor yield function at several altitudes above sea level: new improved computation

2019 ◽  
Author(s):  
Aleksandar Mishev ◽  
Gennady Kovaltsov ◽  
Ilya Usoskin
Keyword(s):  
Sea Level ◽  
Neutron Monitor ◽  
Yield Function

scholarly journals Short- and Medium-Term Induced Ionization in the Earth Atmosphere by Galactic and Solar Cosmic Rays

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Alexander Mishev
Keyword(s):  
Cosmic Rays ◽  
Cosmic Ray ◽  
Ground Level ◽  
Galactic Cosmic Rays ◽  
Earth Atmosphere ◽  
Medium Term ◽  
Ground Level Enhancement ◽  
Solar Cosmic Rays ◽  
The Earth ◽  
Ionization Effect

The galactic cosmic rays are the main source of ionization in the troposphere of the Earth. Solar energetic particles of MeV energies cause an excess of ionization in the atmosphere, specifically over polar caps. The ionization effect during the major ground level enhancement 69 on January 20, 2005 is studied at various time scales. The estimation of ion rate is based on a recent numerical model for cosmic-ray-induced ionization. The ionization effect in the Earth atmosphere is obtained on the basis of solar proton energy spectra, reconstructed from GOES 11 measurements and subsequent full Monte Carlo simulation of cosmic-ray-induced atmospheric cascade. The evolution of atmospheric cascade is performed with CORSIKA 6.990 code using FLUKA 2011 and QGSJET II hadron interaction models. The atmospheric ion rate is explicitly obtained for various latitudes, namely, 40°N, 60°N and 80°N. The time evolution of obtained ion rates is presented. The short- and medium-term ionization effect is compared with the average effect due to galactic cosmic rays. It is demonstrated that ionization effect is significant only in subpolar and polar atmosphere during the major ground level enhancement of January 20, 2005. It is negative in troposphere at midlatitude, because of the accompanying Forbush effect.

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