Experimental study of Alfvén wave reflection from an Alfvén-speed gradient relevant to the solar coronal holes
arxiv(2024)
摘要
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 wave length 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.
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