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Uncovering the Invisible: Imaging the Sun with Helioseismology

15 Jan 2020, 13:00 UTC
Uncovering the Invisible: Imaging the Sun with Helioseismology
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Title: Imaging the Sun’s Far-Side Active Regions by Applying Multiple Measurement Schemes on Multi-Skip Acoustic WavesAuthors: Junwei Zhao, Dominick Hing, Ruizhu Chen, and Shea Hess WebberFirst Author’s Institution: W. W. Hansen Experimental Physics Laboratory, Stanford UniversityStatus: Accepted for publication in the Astrophysical Journal [open access on arXiv]The Sun is the most well-observed star in the Universe. But even with this abundance of observations, part of the solar surface still remains mysterious. The side of the Sun pointing away from us, the far side, remains invisible to observers at Earth until it rotates into view (see Figure 1). However, there is one way we can image the far side of the Sun indirectly. Helioseismology utilizes acoustic waves on the solar surface to study the solar interior. However, these waves also carry information about the far side of the Sun to the near side. Using helioseismology, solar astronomers can create global maps of the solar surface without directly imaging the entire star.
Figure 1: Creating synoptic maps of the full solar magnetic field. These maps, however, show the Sun at several points in time, which doesn’t capture how the global solar magnetic field evolves. Source: National Solar Observatory.Solar astronomers use this ...

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