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On the possible mechanism of the first ground level enhancement in cosmic ray intensity of solar cycle 24
Firoz, Kazi A.1,2; Gan, W. Q.2; Li, Y. P.2; Rodriguez-Pacheco, J.1
2014-03-01
Source PublicationASTROPHYSICS AND SPACE SCIENCE
ISSN0004-640X
Volume350Issue:1Pages:21-32
AbstractWe have carried out this work to comprehend the possible mechanisms of the first ground level enhancement (GLE71 17 May 2012 01:50 UT) in cosmic ray intensity of the solar cycle 24. For this, the cosmic ray intensities registered by neutron monitors at several sites have been analyzed and studied with concurrent solar flares of different energy channels. To assess empirically whether the GLE might have been caused by the energy released from solar flare or CME-driven shock, we identify the possible time line in terms of the lowest spectral index determined from proton fluxes. If the GLE is caused by the energy released from particle acceleration in solar flare, the intensive phase of the flare representing the extreme emission should exist within/around the possible time line. In this respect, it is observed that the possible time line lies within the prominent phase of CME-driven shock. For better understanding, we have checked the possible relativistic energy with respect to solar flare as well as CME-driven shock. As witnessed, if the extreme emission phase of the flare is considered as the reason for the causation of GLE peak, the flare components procured insufficient amount of energy (a parts per thousand currency signa1/40.085 GeV) to produce a GLE. If the extreme emission phase of the flare is also considered as the dominator along GLE onset, the possible energy procurement (a parts per thousand currency signa1/40.414 GeV) is still not adequate to produce a GLE. In contrast, the CME-driven shock is capable of procuring enough possible relativistic energy (a parts per thousand yena1/41.21 GeV) that is sufficient amount of the energy for a GLE production. Any amount of the energy (< 0.414 GeV) released from preceding flare components is supposed to have been contributed to the shock process. Thus, it is assumed that the GLE71 was possibly caused by the energy released from the shock acceleration, which might have been boosted by the energy emanated from preceding flare.
KeywordCosmic Rays Ground Level Enhancement Solar Flare Cme-driven Shock Solar Radio Burst Solar Flux Density Relativistic Energy Particle Release Time
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1007/s10509-013-1729-2
WOS KeywordCORONAL MASS EJECTIONS ; ENERGETIC PARTICLES ; PROTON ACCELERATION ; WIND SPACECRAFT ; EVENTS ; FLARES ; INTERPLANETARY ; NEUTRON ; PLASMA ; RADIO
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Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000332662800003
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10632
Collection太阳高能及相关物理过程研究团组
Affiliation1.Univ Alcala de Henares, Space Res Grp, Alcala De Henares, Spain
2.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Firoz, Kazi A.,Gan, W. Q.,Li, Y. P.,et al. On the possible mechanism of the first ground level enhancement in cosmic ray intensity of solar cycle 24[J]. ASTROPHYSICS AND SPACE SCIENCE,2014,350(1):21-32.
APA Firoz, Kazi A.,Gan, W. Q.,Li, Y. P.,&Rodriguez-Pacheco, J..(2014).On the possible mechanism of the first ground level enhancement in cosmic ray intensity of solar cycle 24.ASTROPHYSICS AND SPACE SCIENCE,350(1),21-32.
MLA Firoz, Kazi A.,et al."On the possible mechanism of the first ground level enhancement in cosmic ray intensity of solar cycle 24".ASTROPHYSICS AND SPACE SCIENCE 350.1(2014):21-32.
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