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Characteristics of DH type II bursts, CMEs and flares with respect to the acceleration of CMEs


Prakash, O.; Umapathy, S.; Shanmugaraju, A.; Pappa kalaivani, P.; Vršnak, Bojan
Characteristics of DH type II bursts, CMEs and flares with respect to the acceleration of CMEs // Astrophysics and space science, 337 (2012), 47-64 doi:10.1007/s10509-011-0817-4 (međunarodna recenzija, članak, znanstveni)


Naslov
Characteristics of DH type II bursts, CMEs and flares with respect to the acceleration of CMEs

Autori
Prakash, O. ; Umapathy, S. ; Shanmugaraju, A. ; Pappa kalaivani, P. ; Vršnak, Bojan

Izvornik
Astrophysics and space science (0004-640X) 337 (2012); 47-64

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
sun; coronal mass ejections; solar flares; type II bursts

Sažetak
A detailed investigation on DH-type-II radio bursts recorded in Deca-Hectometer (hereinafter DH-type-II) wavelength range and their associated CMEs observed during the year 1997-2008 is presented. The sample of 212 DH-type-II associated with CMEs are classified into three populations: (i) Group I (43 events): DH-type-II associated CMEs are accelerating in the LASCO field view (a>15 m s-2) ; (ii) Group II (99 events): approximately constant velocity CMEs (-15<a<15 m s-2) and (iii) Group III (70 events): represents decelerating CMEs (a<-15 m s-2). Our study consists of three steps: (i) statistical properties of DH-type-II bursts of Group I, II and III events ; (ii) analysis of time lags between onsets of flares and CMEs associated with DH-type-II bursts and (iii) statistical properties of flares and CMEs of Group I, II and III events. We found statistically significant differences between the properties of DH-type-II bursts of Group I, II and III events. The significance (P a ) is found using the one-way ANOVA-test to examine the differences between means of groups. For example, there is significant difference in the duration (P a =5%), ending frequency (P a =4%) and bandwidth (P a =4%). The accelerating and decelerating CMEs have more kinetic energy than the constant speed CMEs. There is a significant difference between the nose height of CMEs at the end time of DH-type-IIs (P a ≪1%). From the time delay analysis, we found: (i) there is no significant difference in the delay (flare start—DH-type-II start and flare peak—DH-type-II start) ; (ii) small differences in the time delay between the CME onset and DH-type-II start, delay between the flare start and CME onset times. However, there are high significant differences in: flare duration (P a =1%), flare rise time (P a =0.5%), flare decay time (P a =5%) and CMEs speed (P a ≪1%) of Group I, II and III events. The general LASCO CMEs have lower width and speeds when compared to the DH CMEs. It seems there is a strong relation between the kinetic energy of CMEs and DH-type-II properties.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
007-0000000-1362 - Eruptivni procesi u Sunčevoj atmosferi (Bojan Vršnak, )

Ustanove
Geodetski fakultet, Zagreb

Profili:

Avatar Url Bojan Vršnak (autor)

Citiraj ovu publikaciju

Prakash, O.; Umapathy, S.; Shanmugaraju, A.; Pappa kalaivani, P.; Vršnak, Bojan
Characteristics of DH type II bursts, CMEs and flares with respect to the acceleration of CMEs // Astrophysics and space science, 337 (2012), 47-64 doi:10.1007/s10509-011-0817-4 (međunarodna recenzija, članak, znanstveni)
Prakash, O., Umapathy, S., Shanmugaraju, A., Pappa kalaivani, P. & Vršnak, B. (2012) Characteristics of DH type II bursts, CMEs and flares with respect to the acceleration of CMEs. Astrophysics and space science, 337, 47-64 doi:10.1007/s10509-011-0817-4.
@article{article, year = {2012}, pages = {47-64}, DOI = {10.1007/s10509-011-0817-4}, keywords = {sun, coronal mass ejections, solar flares, type II bursts}, journal = {Astrophysics and space science}, doi = {10.1007/s10509-011-0817-4}, volume = {337}, issn = {0004-640X}, title = {Characteristics of DH type II bursts, CMEs and flares with respect to the acceleration of CMEs}, keyword = {sun, coronal mass ejections, solar flares, type II bursts} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


Uključenost u ostale bibliografske baze podataka:


  • NASA-ADS


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