New method filters false signals from the Sun’s hidden side to build fuller magnetic maps - The Watchers - Watching the world evolve and transform
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A new method for identifying magnetic activity on the far side of the Sun rejects about 90% of false helioseismic detections before they enter solar magnetic-field simulations. Tests found that conventional near-side-driven simulations underestimated the Sun’s total unsigned magnetic flux by roughly 10–20%, showing how much magnetic activity can be missing while active regions develop beyond direct Earth view. Scientists have long been able to reconstruct magnetic maps of the full Sun, but the hidden hemisphere remains a fundamental weakness. Surface flux transport models evolve magnetic fields measured on the Earth-facing side as the Sun rotates, yet they cannot directly capture an active region that emerges or continues growing out of view. The resulting maps provide boundary conditions for models of the corona and heliosphere, so missing far-side magnetic flux can propagate into calculations of the solar environment. Bibhuti Kumar Jha and colleagues developed a probabilistic system for deciding which far-side helioseismic detections are credible enough to add to an Advective Flux Transport (AFT) simulation. Helioseismology does not photograph the magnetic field itself.
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