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Characteristics of events with metric-to-decahectometric type II radio bursts associated with CMEs and flares in relation to SEP events
Prakash, O.1; Feng, Li1; Michalek, G.2; Gan, Weiqun1; Lu, Lei1,3; Shanmugaraju, A.4; Umapathy, S.5
2017-03-01
Source PublicationASTROPHYSICS AND SPACE SCIENCE
ISSN0004-640X
Volume362Issue:3Pages:20
Abstract

A gradual solar energetic particle (SEP) event is thought to happen when particles are accelerated at a shock due to a fast coronal mass ejection (CME). To quantify what kind of solar eruptions can result in such SEP events, we have conducted detailed investigations on the characteristics of CMEs, solar flares and metric-to-decahectometric wavelength type II radio bursts (herein after m-to-DH type II bursts) for SEP-associated and non-SEP-associated events, observed during the period of 1997-2012. Interestingly, 65% of m-to-DH type II bursts associated with CMEs and flares produced SEP events. The SEP-associated CMEs have higher sky-plane mean speed, projection corrected speed, and sky-plane peak speed than those of non-SEP-associated CMEs respectively by 30%, 39%, and 25%, even though the two sets of CMEs achieved their sky-plane peak speeds at nearly similar heights within LASCO field of view. We found Pearson's correlation coefficients between the speeds of CMEs (sky-plane speed and corrected speed) and logarithmic peak intensity of SEP events are cc = 0.62 and cc = 0.58, respectively. We also found that the SEPassociated CMEs are on average of three times more decelerated (-21.52 ms(-2)) than the non-SEP-associated CMEs (-5.63 ms(-2)). The SEP-associated flares have a mean peak flux (1.85 x 10(-4) Wm(-2)) three times larger than that of non-SEP-associated flares, even though the flare duration (rise time) of both sets of events is similar. The SEPassociated m type II bursts have higher frequency drift rate and associated shock speed than those of the non-SEPassociated events by 70% and 25% respectively. The average formation heights of m and DH type II radio bursts for SEP-associated events (1.31 R-o and 3.54 R-o, respectively) are lower than for non-SEP-associated events (1.61 R-o and 3.91 R-o, respectively). 93% of SEP-associated events originate from the western hemisphere and 65% of SEPassociated events are associated with interacting CMEs. The obtained results indicate that, at least for the set of CMEs associated with m-to-DH type II bursts, SEP-associated CMEs are more energetic than those not associated with SEPs, thus suggesting that they are effective particle accelerators.

KeywordCoronal mass ejections Solar flares Type II radio bursts Solar energetic particle events (SEPs)
DOI10.1007/s10509-017-3034-y
WOS KeywordCORONAL MASS EJECTIONS ; ENERGETIC PARTICLE EVENTS ; SOLAR-CYCLES 23 ; DRIVEN SHOCK ; GEOEFFECTIVENESS ; ACCELERATION ; MANIFESTATIONS ; INITIATION ; ERUPTIONS ; LOCATION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000396813800014
PublisherSPRINGER
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23274
Collection中国科学院紫金山天文台
Corresponding AuthorPrakash, O.
Affiliation1.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Astron Observ Jagiellonian Univ, Krakow, Poland
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Arul Anandar Coll, Dept Phys, Madurai 625514, Tamil Nadu, India
5.Madurai Kamaraj Univ, Sch Phys, Madurai 625021, Tamil Nadu, India
Recommended Citation
GB/T 7714
Prakash, O.,Feng, Li,Michalek, G.,et al. Characteristics of events with metric-to-decahectometric type II radio bursts associated with CMEs and flares in relation to SEP events[J]. ASTROPHYSICS AND SPACE SCIENCE,2017,362(3):20.
APA Prakash, O..,Feng, Li.,Michalek, G..,Gan, Weiqun.,Lu, Lei.,...&Umapathy, S..(2017).Characteristics of events with metric-to-decahectometric type II radio bursts associated with CMEs and flares in relation to SEP events.ASTROPHYSICS AND SPACE SCIENCE,362(3),20.
MLA Prakash, O.,et al."Characteristics of events with metric-to-decahectometric type II radio bursts associated with CMEs and flares in relation to SEP events".ASTROPHYSICS AND SPACE SCIENCE 362.3(2017):20.
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