Experimental study of Alfvén wave reflection from an Alfvén-speed gradient relevant to the solar coronal holes
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arXiv
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| Auteurs principaux: | , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866910613104492544 |
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| author | Bose, Sayak TenBarge, Jason M. Carter, Troy Hahn, Michael Ji, Hantao Juno, James Savin, Daniel Wolf Tripathi, Shreekrishna Vincena, Stephen |
| author_facet | Bose, Sayak TenBarge, Jason M. Carter, Troy Hahn, Michael Ji, Hantao Juno, James Savin, Daniel Wolf Tripathi, Shreekrishna Vincena, Stephen |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_06193 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Experimental study of Alfvén wave reflection from an Alfvén-speed gradient relevant to the solar coronal holes Bose, Sayak TenBarge, Jason M. Carter, Troy Hahn, Michael Ji, Hantao Juno, James Savin, Daniel Wolf Tripathi, Shreekrishna Vincena, Stephen Solar and Stellar Astrophysics Plasma Physics 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. |
| title | Experimental study of Alfvén wave reflection from an Alfvén-speed gradient relevant to the solar coronal holes |
| topic | Solar and Stellar Astrophysics Plasma Physics |
| url | https://arxiv.org/abs/2402.06193 |