Strength of the Solar Coronal Magnetic field - A Comparison of Independent Estimates Using Contemporaneous Radio and White-light Observations

Abstract

We estimated the coronal magnetic field strength ($B$) during the 23 July 2016 coronal mass ejection (CME) event using i) the flux rope structure of the CME in the whitelight coronagraph images and ii) the band splitting in the associated type {\sc II} burst. No models were assumed for the coronal electron density ($N(r)$) used in the estimation.The results obtained using the above two independent methods correspond to different heliocentric distances ($r$) in the range $\approx$\,2.5\,--\,4.5${\mathrm{R}}_{\odot }$, but they show excellent consistency and could be fitted with a single power-law distribution of the type $B(r)=5.7r^{-2.6}$ \textrm{G}, which is applicable in the aforementioned distance range. The power law index i.e. $-2.6$) is in good agreement with the results obtained in previous studies by different methods.

arXiv comment15 pages, 6 Figures

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• The Low-Frequency Solar Corona in Circular Polarization
• Type II radio bursts and their association with coronal mass ejections in solar cycles 23 and 24
• A type II solar radio burst without a coronal mass ejection
• On the occurrence of type IV solar radio bursts in the solar cycle 24 and their association with coronal mass ejections
• Imaging-spectroscopy of a band-split type II solar radio burst with the Murchison Widefield Array
• Automated Detection of Solar Radio Bursts using a Statistical Method
• Exploring the circular polarisation of low-frequency solar radio bursts with LOFAR
• Solar Coronal Magnetic Fields and Sensitivity Requirements for Spectropolarimetry Channel of VELC Onboard Aditya-L1
• Trends and Characteristics of High-Frequency Type II Bursts Detected by CALLISTO Spectrometers
• Imaging and Spectral Observations of a Type-II Radio Burst Revealing the Section of the CME-Driven Shock that Accelerates Electrons
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• Deciphering Faint Gyrosynchrotron Emission from Coronal Mass Ejection using Spectro-polarimetric Radio Imaging
• Preparing for Solar and Heliospheric Science with the SKAO: An Indian Perspective
• Assessing the spectral characteristics of band splitting type II radio bursts observed by CALLISTO spectrometers
• Type IV Radio Bursts and Associated Active Regions in the Sunspot Cycle 24
• First Robust Detection of Linear Polarization from Metric Solar Emissions: Challenging Established Paradigms
• Imaging and spectropolarimetric observations of a band-split type II solar radio burst with LOFAR
• Combined Radio and Space-based Solar Observations: From Techniques to New Results
• Possible First Detection of Gyroresonance Emission from a Coronal Mass Ejection in the Middle Corona