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Estimation of a CME magnetic field strength using observations of gyrosynchrotron radiation by E. P. Carley et al.*

9 Jan 2018, 10:03 UTC
Estimation of a CME magnetic field strength using observations of gyrosynchrotron radiation  by E. P. Carley et al.*
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Despite many years of study, the dominant driver and energy source of coronal mass ejections (CMEs) is still under investigation. Observational studies have indicated that magnetic energy represents the largest part of the total energy budget of the eruption (Emslie et al., 2012, Carley et al., 2012). However, despite having such a dominant influence on CME dynamics, little is known about CME magnetic field. This is due to the scarcity of measurements of this CME property. Therefore, any new measure of this quantity represents a rare and important diagnostic that is essential for gaining a complete picture of CME evolution. In this study we report on a rare combination of radio and X-ray observations from non-thermal electrons associated with the development of a CME in the low corona. This combination of observations allows us to estimate the magnetic field associated with the CME core.
Gyrosynchrotron emission sources at the onset of a CME
The SOL2014-09-01 event was associated with a flare occurring 36$^{\circ}$ beyond the east solar limb and a fast coronal mass ejection (~2000 km$\,$s$^{-1}$). Beginning at 11:00 UT, the Nançay Radioheliograph (NRH) observed an unusually large source of radio radiation from 150-445 MHz at the same location as ...

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