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Radio CMEs in the Middle Corona: New Capabilities with the Owens Valley Long Wavelength Array

Presentation #205.02 in the session Observations of Eruptive Flares & CMEs.

Published onSep 18, 2023
Radio CMEs in the Middle Corona: New Capabilities with the Owens Valley Long Wavelength Array

Coronal mass ejections (CMEs) are important space weather drivers. Despite being routinely observed for decades, the properties and evolution of the CME-entrained magnetic fields and energetic particles remain poorly understood. Radio gyrosynchrotron radiation from CMEs is one of the most promising diagnostic methods for constraining both the magnetic field and energetic electrons of CMEs. However, although there have been a handful of radio CME detections, no routine imaging spectropolarimetry observations with adequate sensitivity and dynamic range have been available to make such diagnostics regularly. The Owens Valley Long Wavelength Array (OVRO-LWA), an all-sky imager in the 15-88 MHz frequency range, has recently been upgraded to add antennas at longer baselines, making a centrally-concentrated array of 352 antennas spread in a footprint of 2.6 km. A solar-dedicated backend has been commissioned to provide daily solar imaging spectropolarimetry of the middle corona with high sensitivity and dynamic range. In this presentation, we will use data obtained during the commissioning phase to demonstrate the power of the enhanced OVRO-LWA as a new solar-dedicated facility for studying the “missing pieces” of CMEs in the middle corona.

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