We report the first experimental detection of a reflected Alfvén wave from an Alfvén-speed gradient under conditions similar to those in coronal holes. The experiments were conducted in the Large Plasma Device at the University of California, Los Angeles. We present the experimentally measured dependence of the coefficient of reflection versus the wave inhomogeneity parameter, i.e., the ratio of the wavelength of the incident wave to the length scale of the gradient. Two-fluid simulations using the Gkeyll code qualitatively agree with and support the experimental findings. Our experimental results support models of wave heating that rely on wave reflection at low heights from a smooth Alfvén-speed gradient to drive turbulence.
Bose, Sayak, et al. "Experimental Study of Alfvén Wave Reflection from an Alfvén-speed Gradient Relevant to the Solar Coronal Holes." The Astrophysical Journal, vol. 971, no. 1, Aug. 2024. https://doi.org/10.3847/1538-4357/ad528f
Bose, Sayak, TenBarge, Jason M., Carter, Troy, Hahn, Michael, Ji, Hantao, Juno, James, Savin, Daniel Wolf, Tripathi, Shreekrishna, & Vincena, Stephen (2024). Experimental Study of Alfvén Wave Reflection from an Alfvén-speed Gradient Relevant to the Solar Coronal Holes. The Astrophysical Journal, 971(1). https://doi.org/10.3847/1538-4357/ad528f
Bose, Sayak, TenBarge, Jason M., Carter, Troy, et al., "Experimental Study of Alfvén Wave Reflection from an Alfvén-speed Gradient Relevant to the Solar Coronal Holes," The Astrophysical Journal 971, no. 1 (2024), https://doi.org/10.3847/1538-4357/ad528f
@article{osti_2427092,
author = {Bose, Sayak and TenBarge, Jason M. and Carter, Troy and Hahn, Michael and Ji, Hantao and Juno, James and Savin, Daniel Wolf and Tripathi, Shreekrishna and Vincena, Stephen},
title = {Experimental Study of Alfvén Wave Reflection from an Alfvén-speed Gradient Relevant to the Solar Coronal Holes},
annote = {Abstract We report the first experimental detection of a reflected Alfvén wave from an Alfvén-speed gradient under conditions similar to those in coronal holes. The experiments were conducted in the Large Plasma Device at the University of California, Los Angeles. We present the experimentally measured dependence of the coefficient of reflection versus the wave inhomogeneity parameter, i.e., the ratio of the wavelength of the incident wave to the length scale of the gradient. Two-fluid simulations using the Gkeyll code qualitatively agree with and support the experimental findings. Our experimental results support models of wave heating that rely on wave reflection at low heights from a smooth Alfvén-speed gradient to drive turbulence. },
doi = {10.3847/1538-4357/ad528f},
url = {https://www.osti.gov/biblio/2427092},
journal = {The Astrophysical Journal},
issn = {ISSN 0004-637X},
number = {1},
volume = {971},
place = {United States},
publisher = {American Astronomical Society},
year = {2024},
month = {08}}
Cranmer, Steven R.; Asgari-Targhi, Mahboubeh; Miralles, Mari Paz
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 373, Issue 2041https://doi.org/10.1098/rsta.2014.0148