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A new approach to radio observations for forecasting shock arrival
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SYSNO ASEP 0521247 Document Type A - Abstract R&D Document Type The record was not marked in the RIV R&D Document Type Není vybrán druh dokumentu Title A new approach to radio observations for forecasting shock arrival Author(s) Jebaraj, I. C. (BE)
Magdalenic, J. (BE)
Scolini, C. (BE)
Podlachikova, T. (RU)
Dissauer, K. (AT)
Pomoell, J. (FI)
Rodriguez, L. (BE)
Kilpua, E. (FI)
Krupař, Vratislav (UFA-U) RID, ORCID
Veronig, A. (AT)
Poedts, S. (BE)Number of authors 11 Source Title 16th European Space Weather Week. - Brussels : Solar-Terrestrial Centre of Excellence (STCE), 2019 Number of pages 1 s. Publication form Online - E Action European Space Weather Week /16./ Event date 18.11.2019 - 22.11.2019 VEvent location Liège Country BE - Belgium Event type WRD Language eng - English Country BE - Belgium Keywords geomagnetic storms ; Coronal mass ejections ; shock waves ; radio emissions Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Institutional support UFA-U - RVO:68378289 Annotation The disturbed geomagnetic conditions at the Earth, i.e. geomagnetic storms, are mainly driven by the Coronal mass ejections (CMEs) and associated shock waves. Therefore, tracking of CMEs and shocks and predicting their arrival at the Earth is an important scientific topic in the space weather. The shock associated radio emission, so called type II radio bursts, is frequently used to forecast the shock arrival to the Earth. The success of such a forecast is very variable. Forecasting results strongly depend on the source position of the radio emission relative to the CME (CME-flank or CME leading edge). Combination of the ground based and space-based radio observations provide us the unique opportunity to track shock waves starting from the Sun and to the inner heliosphere, and relate these observations with the CME observed in the white light. Herein we present rather novel technique so called radio triangulation, which surpasses the classically used 2D analysis of radio emissions and application of the 1D density models. Using stereoscopic radio observations, so called goniopolarimetric observations from the WAVES instrument onboard WIND, STEREO A and STEREO B, we can identify the source positions of interplanetary radio emission in the 3D space. The obtained results are then compared with the associated CME with the aim to understand if the CME-flank or the CME leading edge is the preferable type II source position. We study the CME/flare event on September 27/28, 2012. The GOES C3.7 flare was associated with the full-halo CME (first seen in the SOHO/LASCO C2 field of view at 23:47 UT) and white light shock observed by all three spacecraft STEREO A, STEREO B, and SOHO. The associated radio event is composed of a groups of type III bursts and two type II bursts with different starting time and frequency. The radio triangulation study shows that the first type II burst seem to be CME-driven, but the second type II occurs significantly higher in the solar corona than the CME, and has unclear origin. Since the radio source positions of the second type II are situated close to the nearby streamer, we believe that the shock wave – streamer interaction is the source of the second type II burst. In this event, using the second type II burst to predict the shock wave arrival at the Earth will be highly unreliable, showing large difference between the observed and predicted shock arrival. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2020
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