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Title: Understanding coronal mass ejections and associated shocks in the solar corona by merging multiwavelength observations

Using multiwavelength imaging observations, in EUV, white light and radio, and radio spectral data over a large frequency range, we analyzed the triggering and development of a complex eruptive event. This one includes two components, an eruptive jet and a coronal mass ejection (CME), which interact during more than 30 minutes, and can be considered as physically linked. This was an unusual event. The jet is generated above a typical complex magnetic configuration that has been investigated in many former studies related to the build-up of eruptive jets; this configuration includes fan-field lines originating from a corona null point above a parasitic polarity, which is embedded in one polarity region of a large active region. The initiation and development of the CME, observed first in EUV, does not show usual signatures. In this case, the eruptive jet is the main actor of this event. The CME appears first as a simple loop system that becomes destabilized by magnetic reconnection between the outer part of the jet and the ambient medium. The progression of the CME is closely associated with the occurrence of two successive type II bursts from a distinct origin. An important part of this study is the firstmore » radio type II burst for which the joint spectral and imaging observations were allowed: (1) to follow, step by step, the evolution of the spectrum and of the trajectory of the radio burst, in relationship with the CME evolution and (2) to obtain, without introducing an electronic density model, the B field and the Alfvén speed.« less
Authors:
;  [1] ; ; ; ;  [2]
  1. School of Physics, Trinity College Dublin, Dublin 2 (Ireland)
  2. LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 5 Place Janssen, F-92195 Meudon (France)
Publication Date:
OSTI Identifier:
22370296
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 795; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ALFVEN WAVES; CONFIGURATION; DENSITY; EVOLUTION; EXTREME ULTRAVIOLET SPECTRA; FREQUENCY RANGE; MAGNETIC RECONNECTION; MASS; RADIO TELESCOPES; SOLAR CORONA; SPECTRA; SUN; VELOCITY; VISIBLE SPECTRA