For the first time, researchers at the Yunnan Astronomical Observatory of the Chinese Academy of Sciences have observed and verified that the coronal wave packet is completely reflected at the boundary of the coronal hole. This provides essential evidence of the nature of corona waves.
The study was published in Astronomy and astrophysics March 22.
A highly structured corona is a non-uniform, anisotropic medium filled with a hot magnetized plasma. Waves are often physical parameters (eg, Magnetic field strengthDensity, temperature) will change significantly during propagation, such as in active regions and coronal holes.
Because these regions have high-speed, high-speed mode magnetic sonic velocities, the waves encountered in these regions are often affected and exhibit true wave characteristics such as refraction. Reflection And send. However, as an essential feature of variation theory, total internal reflection has not yet been detected.
Researchers used advanced spatial and temporal imaging observations to analyze coronary wave packets excited from the eastern end of the sun. “This wave sequence propagated southwest along the coronal hole and was reflected at the boundary when it encountered the coronal hole in the coronal hole. Antarctic“Shinpei Zhou, the lead author of the study, said.
The critical angle of total internal reflection was 38 degrees obtained by combining the electron density ratio inside and outside the coronal hole boundary and the differential radiometry (DEM) method. The angle of incidence obtained from the observation was 33 °.
“The angle of incidence and the angle of reflection satisfy the condition of total internal reflection. That is, the angle of incidence is smaller than the critical angle. angleIt proves that the reflection of the wave packet at the boundary of the coronal hole was total internal reflection. “
The total internal reflection observed in this study further enriches the characteristics of the interaction between the corona wave and the coronal hole. So far, all possible transmissions, partial reflections, refraction Total internal reflection phenomenon is observed.
This study provides observational evidence of Coronal’s true wave theory. wave..
Xinping Zhou et al, Total Internal Reflection of Flare-Driven Quasi-Periodic Extreme Wave Packets at Coronal Hole Boundaries, Astronomy and astrophysics (2022). DOI: 10.1051 / 0004-6361 / 202142536
Chinese Academy of Sciences
Quote: Researchers at the coronal hole (March 30, 2022) obtained from https: //phys.org/news/2022-03-total-ultraviolet-coronal-hole.html on March 30, 2022. Observe the total internal reflection of the UV wave train.
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Researchers observe total internal reflection of UV wave packets in a coronal hole
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