Solar flares are complex phenomena. They involve plasma, electromagnetic radiation across all wavelengths, activity in the Sun’s atmosphere layers, and particles travelling at near light speed. Spacecraft like NASA’s Solar and Heliophysics Observatory (SOHO) and the Parker Solar Probe shed new light on the Sun’s solar flares. But it was a Japanese-led mission called Yohkoh … Continue reading 'During a Solar Flare, Dark Voids Move Down Towards the Sun. Now We Know Why'
Solar flares are complex phenomena. They involve plasma, electromagnetic radiation across all wavelengths, activity in the Sun’s atmosphere layers, and particles travelling at near light speed. Spacecraft like NASA’s Solar and Heliophysics Observatory and the Parker Solar Probe shed new light on the Sun’s solar flares.
A supra-arcade is a solar arcade with added features. Along with the loops, there are downflows above the arcade. Scientists thought supra-arcades are somehow connected with the magnetic reconnection behind solar flares, but the specifics were unknown.. “What’s driving them, and are they truly tied to magnetic reconnection?”
“It’s like stretching out a rubber band and snipping it in the middle. It’s stressed and stretched thin, so it’s going to snap back,” Reeves added. “This is not predicted by classic reconnection models, which show the downflows should be much quicker. It’s a conflict that requires some other explanation,” lead author Shen said.
Shen and the other authors created 3D simulations of solar flares and compared them to solar flares the SDO observed. They found that magnetic reconnection isn’t the source of SADs. The authors say that the turbulent environment in this “interface region” where downward reconnection outflows impinge on closed flare arcades hasn’t received much attention in previous research. “This interface region hosts a myriad of turbulent flows, electron currents, and shocks, crucial for flare energy release and particle acceleration,” the authors explain in their paper.
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