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Development of Far-side Magnetic Flux Measurements Using GONG Quicklook Data

Presentation #109.04 in the session Helioseismology and Solar Interior Posters.

Published onSep 18, 2023
Development of Far-side Magnetic Flux Measurements Using GONG Quicklook Data

Solar wind models are highly dependent on global magnetic fields at the solar surface as their inner boundary condition, and the lack of global field data is a significant problem plaguing solar wind modeling. Currently, only direct observations of the near-side magnetic field exist and far-side modeled approximations are incapable of predicting growth of existing active regions or new magnetic flux emergence. Chen et al. (2022) developed a method that calibrates far-side acoustic travel-time maps, which are calculated using near-side Doppler observations and the helioseismic time-distance technique, to far-side magnetic flux maps. The calibration employs multiple machine-learning methods that use EUV 304 Angstrom data as a bridge. As part of a Research-to-Operations (R2O) effort to achieve Technology Readiness Level (TRL) 5 – prototype testing – we are building upon that work, the difference now being the Dopplergrams used to produce the acoustic travel-time maps come from the ground-based GONG observations. We present our time-distance based acoustic travel-time maps and preliminary far-side flux maps based on GONG “quicklook” Dopplergrams. We will also discuss lessons learned relative to achieving TRL-5 within an R2O framework.

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