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Title: Measured Reduction in Alfvén Wave Energy Propagating through Longitudinal Gradients Scaled to Match Solar Coronal Holes

Abstract

We have explored the effectiveness of a longitudinal gradient in Alfvén speed in reducing the energy of propagating Alfvén waves under conditions scaled to match solar coronal holes. The experiments were conducted in the Large Plasma Device at the University of California, Los Angeles. Our results show that the energy of the transmitted Alfvén wave decreases as the inhomogeneity parameter, λ/L A, increases. Here, λ is the wavelength of the Alfvén wave and L A is the scale length of the gradient in Alfvén speed. For gradients similar to those in coronal holes, the waves are observed to lose a factor of ≈5 more energy than they do when propagating through a uniform plasma without a gradient. Furthermore, we have carried out experiments and analyses to constrain the cause of wave energy reduction in the gradient. The loss of Alfvén wave energy from mode coupling is unlikely, as we have not detected any other modes. Contrary to theoretical expectations, the reduction in the energy of the transmitted wave is not accompanied by a detectable reflected wave. Nonlinear effects are ruled out because the amplitude of the initial wave is too small and the wave frequency well below the ion cyclotronmore » frequency. Since the total energy must be conserved, it is possible that the lost wave energy is being deposited in the plasma. Further studies are needed to explore where the energy is going.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [1]
  1. Columbia Univ., New York, NY (United States)
  2. Univ. of California, Los Angeles, CA (United States)
Publication Date:
Research Org.:
Columbia Univ., New York, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF)
OSTI Identifier:
1612671
Grant/Contract Number:  
SC0016602; AGS–9724366
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 882; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; astronomy & astrophysics; magnetic fields; magnetohydrodynamics (MHD); plasmas; solar wind; Sun: corona; waves

Citation Formats

Bose, Sayak, Carter, Troy, Hahn, Michael, Tripathi, Shreekrishna, Vincena, Stephen, and Savin, Daniel Wolf. Measured Reduction in Alfvén Wave Energy Propagating through Longitudinal Gradients Scaled to Match Solar Coronal Holes. United States: N. p., 2019. Web. https://doi.org/10.3847/1538-4357/ab2fe0.
Bose, Sayak, Carter, Troy, Hahn, Michael, Tripathi, Shreekrishna, Vincena, Stephen, & Savin, Daniel Wolf. Measured Reduction in Alfvén Wave Energy Propagating through Longitudinal Gradients Scaled to Match Solar Coronal Holes. United States. https://doi.org/10.3847/1538-4357/ab2fe0
Bose, Sayak, Carter, Troy, Hahn, Michael, Tripathi, Shreekrishna, Vincena, Stephen, and Savin, Daniel Wolf. Tue . "Measured Reduction in Alfvén Wave Energy Propagating through Longitudinal Gradients Scaled to Match Solar Coronal Holes". United States. https://doi.org/10.3847/1538-4357/ab2fe0. https://www.osti.gov/servlets/purl/1612671.
@article{osti_1612671,
title = {Measured Reduction in Alfvén Wave Energy Propagating through Longitudinal Gradients Scaled to Match Solar Coronal Holes},
author = {Bose, Sayak and Carter, Troy and Hahn, Michael and Tripathi, Shreekrishna and Vincena, Stephen and Savin, Daniel Wolf},
abstractNote = {We have explored the effectiveness of a longitudinal gradient in Alfvén speed in reducing the energy of propagating Alfvén waves under conditions scaled to match solar coronal holes. The experiments were conducted in the Large Plasma Device at the University of California, Los Angeles. Our results show that the energy of the transmitted Alfvén wave decreases as the inhomogeneity parameter, λ/L A, increases. Here, λ is the wavelength of the Alfvén wave and L A is the scale length of the gradient in Alfvén speed. For gradients similar to those in coronal holes, the waves are observed to lose a factor of ≈5 more energy than they do when propagating through a uniform plasma without a gradient. Furthermore, we have carried out experiments and analyses to constrain the cause of wave energy reduction in the gradient. The loss of Alfvén wave energy from mode coupling is unlikely, as we have not detected any other modes. Contrary to theoretical expectations, the reduction in the energy of the transmitted wave is not accompanied by a detectable reflected wave. Nonlinear effects are ruled out because the amplitude of the initial wave is too small and the wave frequency well below the ion cyclotron frequency. Since the total energy must be conserved, it is possible that the lost wave energy is being deposited in the plasma. Further studies are needed to explore where the energy is going.},
doi = {10.3847/1538-4357/ab2fe0},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 882,
place = {United States},
year = {2019},
month = {9}
}

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