On the statistical characteristics of radio-loud and radio-quiet halo coronal mass ejections and their associated flares during solar cycles 23 and 24 |
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| Institution: | 1. Department of Physics, H.R. Institute of Technology, Ghaziabad 201003, India;2. Astrophysics Research Group, Meerut College, Meerut 250002, India;3. Uttarakhand Space Application Centre, Dehradun 248006, India;4. Department of Physics, MM College, Modinagar, Ghaziabad 201204, India;1. TEI of Western Macedonia, Kozani, Greece;2. KAIST, Daejeon, South Korea;3. University of Ioannina, Ioannina Gr 451 10, Greece;4. Department of Theoretical Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;5. Department of Physics, Ben Gurion University, Israel;1. Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China;2. University of Chinese Academy of Science, Beijing 100039, China;1. INAF Astronomical Observatory of Padova, via dell’Osservatorio 8, 36012 Asiago (VI), Italy;2. ANS Collaboration, c/o Astronomical Observatory, 36012 Asiago (VI), Italy |
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| Abstract: | We have studied the characteristics of radio-loud (RL) and radio-quiet (RQ) front side halo coronal mass ejections (HCMEs) (angular width 360°) observed between the time period years 1996–2014. RL-HCMEs are associated with type II radio bursts, while RQ-HCMEs are not associated with type II radio bursts. CMEs near the Sun in the interplanetary medium associated with radio bursts also affect the magnetosphere. The type II radio burst data was observed by WIND/WAVES instrument and HCMEs were observed by LASCO/ SOHO instruments. In our study, we have examined the properties of RL-HCMEs and RQ-HCMEs and found that RL-HCMEs follow the solar cycle variation. Our study also shows that the 26% of slow speed HCMEs and 82% of fast speed HCMEs are RL. The average speed of RL-HCMEs and RQ-HCMEs are 1370 km/s and 727 km/s, respectively. Most of the RQ-HCMEs occur around the solar disc center while most of RL-HCMEs are uniformly distributed across the solar disc. The mean value of acceleration of RL-HCMEs is more than twice that of RQ-HCMEs and mean value of deceleration of RL- HCMEs is very small compare to RQ-HCMEs events. It is also found that RQ-HCMEs events are associated with C- and M-class of SXR flares, while RL-HCMEs events are associated with M and X-class of SXR flares, which indicates that the RQ-HCMEs are less energetic than the RL-HCMEs. We have also discussed the various results obtained in present investigation in view of recent scenario of solar physics. |
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