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AN INTERPRETATION OF THE POSSIBLE MECHANISMS OF TWO GROUND-LEVEL ENHANCEMENT EVENTS
Firoz, Kazi A.1; Gan, W. Q.1; Moon, Y. -J.2; Li, C.3
2012-10-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-6256
Volume758Issue:2Pages:119(13pp)
AbstractWe have carried out this work to clarify the possible mechanisms of two important high-energy particle events (GLE69 2005 January 20, 06: 46 UT and GLE70 2006 December 13, 02: 45 UT). For this purpose, the cosmic-ray intensities registered by neutron monitors at several sites have been analyzed and studied with concurrent solar flares of different energy bands. To determine whether the ground-level enhancement (GLE) might be caused by the energy released from a solar flare or a CME-driven shock, we identify the particle injection time in terms of the lowest value of the spectral indices deduced from proton fluxes. If the GLE is caused by the energy released from particle acceleration in a solar flare, the intensive phase of the flare representing extreme emission should lie within the injection time. While fulfilling this criterion, it is further necessary to understand the possible relativistic energy computed in terms of the possible travel time deduced by employing the observational time lag between the GLE and the concurrent solar flare. Accordingly, we have found that GLE69 is procured with sufficient possible relativistic energy (similar to 1.619 GeV) by the energy released from particle accelerations in the intensive phases of a solar flare components that have been corroborated by the injection time. The intensive phases of the flare components have also been justified with the prominent phases of a solar radio type III burst. For event GLE70, the particle injection time lies within the CME-driven shock justified by a solar radio type II burst which seems to be capable of procuring sufficient possible relativistic energies (similar to 1.231 to similar to 2.017 GeV). It is also noted that any fractional amount of energy (similar to 0.226 to similar to 0.694 GeV) from preceding flare components might be considered as a contribution to the shock acceleration process. Thus, GLE70 is presumably caused by the sum of the energy released mostly from a CME-driven shock and partially from preceding flare components.
KeywordAcceleration Of Particles Cosmic Rays Magnetic Fields Sun: Coronal Mass Ejections (Cmes) Sun: Flares Sun: Magnetic Topology Sun: X-Rays, Gamma Rays
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/758/2/119
WOS KeywordRELATIVISTIC PROTON PRODUCTION ; ENERGETIC PARTICLE EVENTS ; CORONAL MASS EJECTION ; JANUARY 2005 FLARE ; SOLAR-FLARE ; RELEASE TIMES ; JULY 14 ; X-RAYS ; ACCELERATION ; SUN
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000310562000048
Citation statistics
Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8041
Collection太阳高能及相关物理过程研究团组
Affiliation1.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Kyung Hee Univ, Sch Space Res, Yongin 446701, Gyeonggi Do, South Korea
3.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Firoz, Kazi A.,Gan, W. Q.,Moon, Y. -J.,et al. AN INTERPRETATION OF THE POSSIBLE MECHANISMS OF TWO GROUND-LEVEL ENHANCEMENT EVENTS[J]. ASTROPHYSICAL JOURNAL,2012,758(2):119(13pp).
APA Firoz, Kazi A.,Gan, W. Q.,Moon, Y. -J.,&Li, C..(2012).AN INTERPRETATION OF THE POSSIBLE MECHANISMS OF TWO GROUND-LEVEL ENHANCEMENT EVENTS.ASTROPHYSICAL JOURNAL,758(2),119(13pp).
MLA Firoz, Kazi A.,et al."AN INTERPRETATION OF THE POSSIBLE MECHANISMS OF TWO GROUND-LEVEL ENHANCEMENT EVENTS".ASTROPHYSICAL JOURNAL 758.2(2012):119(13pp).
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