New evidence for how heat is transported below the sun’s surface | Science & Technology

A team of solar physicists at NYU Abu Dhabi’s Center for Astrophysics and Space Science (CASS), led by Research Scientist Chris S. Hanson, Ph.D., has revealed the interior structure of the sun’s supergranules, a flow structure that transports heat from the sun’s hidden interior to its surface. The researchers’ analysis of the supergranules presents a challenge to the current understanding of solar convection.

The sun generates energy in its core through nuclear fusion; that energy is then transported to the surface, where it escapes as sunlight. In the study “Supergranular-scale solar convection not explained by mixing-length theory” published in the journal Nature Astronomy, the researchers explain how they utilized Doppler, intensity and magnetic images from the helioseismic and magnetic imager (HMI) onboard NASA’s Solar Dynamics Observatory (SDO) satellite to identify and characterize approximately 23,000 supergranules. Since the sun’s surface is opaque to light, the NYUAD scientists used sound waves to probe the interior structure of the supergranules. These sound waves, which are generated by the smaller granules and are everywhere in the sun, have been successfully used in the past in a field known as Helioseismology.

By analyzing such a large dataset of supergranules, which were estimated to extend 20,000 Km (~3% into the interior) below the surface of the sun, the scientists were able to determine the up and down flows associated with supergranular heat transport with unprecedented accuracy. In addition to inferring how deep the supergranules extend, the scientists also discovered that the downflows appeared ~40 percent weaker than the upflows, which suggests that some component was missing from the downflows.

Through extensive testing and theoretical arguments, the authors theorize that the “missing” or unseen component could consist of small scale (~100Km) plumes that transport cooler plasma down into the sun’s interior. The sound waves in the sun…


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