Three-dimensional reconstruction of CME-driven shock-streamer interaction from radio and EUV observations: a different take on the diagnostics of coronal magnetic fields

Abstract

On 2014 October 30, a band-splitted type II radio burst associated with a coronal mass ejection (CME) observed by the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamic Observatory (SDO) occurred over the southeast limb of the Sun. The fast expansion in all directions of the plasma front acted as a piston and drove a spherical fast shock ahead of it, whose outward progression was traced by simultaneous images obtained with the Nançay Radioheliograph (NRH). The geometry of the CME/shock event was recovered through 3D modeling, given the absence of concomitant stereoscopic observations, and assuming that the band-splitted type II burst was emitted at the intersection of the shock surface with two adjacent low-Alfven speed coronal streamers. From the derived spatiotemporal evolution of the standoff distance between shock and CME leading edge, we were finally able to infer the magnetic field strength $B$ in the inner corona. A simple radial profile of the form $B(r)=(12.6\pm 2.5)r^{-4}$ nicely fits our results, together with previous estimates, in the range $r=1.1-2.0$ solar radii.

arXiv commentAccepted for publication in Astronomy & Astrophysics Letters

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Cited by in corpus (19)

• The Solar Orbiter mission -- Science overview
• Direct Estimates of the Solar Coronal Magnetic Field Using Contemporaneous Extreme-ultraviolet, Radio, and White-light Observations
• Evolution of the Alfvén Mach number associated with a coronal mass ejection shock
• First Observation of a Type II Solar Radio Burst Transitioning Between a Stationary and Drifting State
• Using radio triangulation to understand the origin of two subsequent type II radio bursts
• Moving solar radio bursts and their association with coronal mass ejections
• LOFAR observations of a jet-driven piston shock in the low solar corona
• Shock-accelerated electrons during the fast expansion of a coronal mass ejection
• Statistical analysis of circular-ribbon flares
• A Coronal Mass Ejection followed by a prominence eruption and a plasma blob as observed by Solar Orbiter
• Tracking the 3D evolution of a halo coronal mass ejection using the revised cone model
• Multi-wavelength Observations of a Metric Type-II Event
• Radio evidence for a shock wave reflected by a coronal hole
• Electron acceleration and radio emission following the early interaction of two coronal mass ejections
• Three-dimensional analyses of an aspherical coronal mass ejection and its driven shock
• Three-dimensional reconstruction of type U radio bursts: a novel remote sensing approach for coronal loops
• Determining the acceleration regions of in situ electrons using remote radio and X-ray observations
• Estimating the lateral speed of a fast shock driven by a coronal mass ejection at the location of solar radio emissions
• Enhancing MHD model accuracy and CME forecasting by constraining coronal plasma properties with Faraday rotation