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.
Original language | English |
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Article number | 72 |
Journal | Astrophysical Journal |
Volume | 971 |
Issue number | 1 |
DOIs | |
State | Published - Aug 1 2024 |
Externally published | Yes |
Funding
This work was supported by the US DOE Frontier Plasma Science program and General plasma science program funded by contract number DE- AC0209CH11466. J.M.T. was additionally supported by the NSF CSSI (Cyberinfrastructure for Sustained Scientific Innovation) program, grant No. 2209471. D.W.S. and M.H. were supported by the DOE grant No. DE-SC0021261. J.J. was supported by the U.S. Department of Energy under Contract No. DE-AC02-09CH1146 via an LDRD grant. The experiments were performed at the Basic Plasma Science Facility (BaPSF), which is a collaborative research facility supported by the DOE and NSF, with major facility instrumentation developed via an NSF award AGS9724366. The simulations presented in this article were performed on computational resources managed and supported by Princeton Research Computing, a consortium of groups including the Princeton Institute for Computational Science and Engineering (PICSciE) and the Office of Information Technology\u2019s High Performance Computing Center and Visualization Laboratory at Princeton University.
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Data for figures in "Experimental study of Alfvén wave reflection from an Alfvén-speed gradient relevant to the solar coronal holes"
Bose, S. (Creator), TenBarge, J. M. (Creator), Carter, T. (Creator), Hahn, M. G. (Creator), Ji, H. (Creator), Juno, J. (Creator), Savin, D. (Creator), Tripathi, S. (Creator) & Vincena, S. (Creator), Princeton Data Commons Discovery, Jan 1 2024
DOI: 10.34770/a9h3-r161
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