Using radio triangulation to understand the origin of two subsequent type II radio bursts
| dc.contributor.author | Jebaraj, I. C. | |
| dc.contributor.author | Magdalenic, J. | |
| dc.contributor.author | Podladchikova, T. | |
| dc.contributor.author | Scolini, C. | |
| dc.contributor.author | Pomoell, J. | |
| dc.contributor.author | Veronig, A. M. | |
| dc.contributor.author | Dissauer, K. | |
| dc.contributor.author | Krupar, V. | |
| dc.contributor.author | Kilpua, E. K. J. | |
| dc.contributor.author | Poedts, S. | |
| dc.date.accessioned | 2020-07-02T17:33:36Z | |
| dc.date.available | 2020-07-02T17:33:36Z | |
| dc.date.issued | 2020-05-07 | |
| dc.description.abstract | Context. Eruptive events such as coronal mass ejections (CMEs) and flares accelerate particles and generate shock waves which can arrive at Earth and can disturb the magnetosphere. Understanding the association between CMEs and CME-driven shocks is therefore highly important for space weather studies. Aims. We present a study of the CME/flare event associated with two type II bursts observed on September 27, 2012. The aim of the study is to understand the relationship between the observed CME and the two distinct shock wave signatures. Methods. The multiwavelength study of the eruptive event (CME/flare) was complemented with radio triangulation of the associated radio emission and modelling of the CME and the shock wave employing MHD simulations. Results. We found that, although temporal association between the type II bursts and the CME is good, the low-frequency type II (LF-type II) burst occurs significantly higher in the corona than the CME and its relationship to the CME is not straightforward. The analysis of the EIT wave (coronal bright front) shows the fastest wave component to be in the southeast quadrant of the Sun. This is also the quadrant in which the source positions of the LF-type II were found to be located, probably resulting from the interaction between the shock wave and a streamer. Conclusions. The relationship between the CME/flare event and the shock wave signatures is discussed using the temporal association, as well as the spatial information of the radio emission. Further, we discuss the importance and possible effects of the frequently nonradial propagation of the shock wave. | en_US |
| dc.description.sponsorship | EIT and LASCO data have been used courtesy of the SOHO/EIT and SOHO/LASCO consortiums, respectively. The STEREO SECCHI data are produced by a consortium of RAL(UK), NRL(USA), LMSAL(USA), GSFC(USA), MPS(Germany), CSL(Belgium), IOTA(France), and IAS(France). The Wind/Waves instrument was designed and built as a joint effort of the Paris-Meudon Observatory, the University of Minnesota, and the Goddard Space Flight Center, and the data are available at the instrument Web site. We thank the radio monitoring service at LESIA (Observatoire de Paris) for providing value-added data that have been used for this study. We are grateful to the staff of the Bruny Island Radio Spectrometer for their open data policy. The authors are grateful for useful discussions with Dr. Bojan Vršnak, Dr. Eduard Kontar, and Dr. Milan Maksimovic, regarding the propagation of the radio emission and scattering effects. The authors are also thankful to the anonymous referee for their valuable input which helped us to significantly improve the manuscript. I.C.J. was supported by a PhD grant awarded by the Royal Observatory of Belgium. C.S. acknowledges funding from the Research Foundation - Flanders (FWO, fellowship no. 1S42817N). K.D. and A.M.V. acknowledge funding by the Austrian Space Applications Programme of the Austrian Research Promotion Agency FFG (ASAP-11 4900217 BMVIT) and the Austrian Science Fund FWF: P24092-N16 and P27292-N20. EK acknowledges Finnish Centre of Excellence in Research of Sustainable Space (Academy of Finland grant number 1312390), European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (ERC-COG 724391), and Academy of Finland project SMASH no. 310445. EUHFORIA is developed as a joint effort between the University of Helsinki and KU Leuven. The validation of solar wind and CME modelling with EUHFORIA is being performed within the BRAIN-be project CCSOM (Constraining CMEs and Shocks by Observations and Modelling throughout the inner heliosphere; www.sidc.be/ccsom/) and BRAIN-be project SWiM (Solar Wind Modeling with EUHFORIA for the new heliospheric missions) | en_US |
| dc.description.uri | https://www.aanda.org/component/article?access=doi&doi=10.1051/0004-6361/201937273 | en_US |
| dc.format.extent | 16 pages | en_US |
| dc.genre | journal articles | en_US |
| dc.identifier | doi:10.13016/m2kkr4-mg3a | |
| dc.identifier.citation | I.C. Jebaraj et al., Using radio triangulation to understand the origin of two subsequent type II radio bursts, Astronomy & Astrophysics (A&A), https://doi.org/10.1051/0004-6361/201937273 | en_US |
| dc.identifier.uri | https://doi.org/10.1051/0004-6361/201937273 | |
| dc.identifier.uri | http://hdl.handle.net/11603/19059 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | EDP sciences | en_US |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Goddard Planetary Heliophysics Institute (GPHI) | |
| dc.relation.ispartof | UMBC Faculty Collection | |
| dc.rights | This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author. | |
| dc.rights | © ESO 2020. | |
| dc.title | Using radio triangulation to understand the origin of two subsequent type II radio bursts | en_US |
| dc.type | Text | en_US |