Sunspots aren't the only speckles decorating the dynamic face of our Sun. Solar physicists have made a close study of tiny, fleeting speckles of brightness that emerge and fade in less than a minute on average, in regions where loops of plasma rise f
, for example, are regions where magnetic fields are particularly strong, and solar flares and coronal mass ejections are produced by magnetic field lines snapping and reconnecting.The 11-year solar cycles mentioned earlier are driven by the magnetic field reversal that takes place every 11 years, when the solar magnetic poles switch places.
Image processing drew the dots into greater prominence, allowing the team to study them in detail. Over the course of about an hour, they were able to observe and characterize around 170 dots. Comparison with data from NASA's Solar Dynamics Observatory showing the Sun's magnetic field revealed that the dots appeared in the entire field of view covered by Solar Orbiter, but were more densely clustered in more magnetically active regions, especially the bigger and brighter dots.The next step was to try and figure out what causes the speckles.
However, some of the dots did not appear in regions with tangled magnetic fields, which suggests there might be multiple formation pathways for these mysterious features. One possible explanation, the team said, is the propagation of magnetoacoustic waves in the solar plasma, which could produce shocks that result in dots.
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