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Title: Super-Alfvénic Propagation and Damping of Reconnection Onset Signatures: RECONNECTION KAW DAMPING

Abstract

The quadrupolar out-of-plane Hall magnetic leld generated during collisionless reconnection propagates away from the x line as a kinetic Alfvén wave (KAW). While it has been shown that this KAW carries substantial Poynting flux and propagates super-Alfvenically, how this KAW damps as it propagates away from the x line is not well understood. In this study, this damping is examined using kinetic particle-in-cell simulations of antiparallel symmetric magnetic reconnection in a one-dimensional current sheet equilibrium. In the reconnection simulations, the KAW wave vector has a typical magnitude comparable to an inverse fluid Larmor radius (effectively an inverse ion Larmor radius) and a direction of 85–89°relative to the local magnetic field. We find that the damping of the reconnection KAW is consistent with linear Landau damping results from a numerical Vlasov dispersion solver. This knowledge allows us to generalize our damping predictions to regions in the magnetotail and solar corona where the magnetic geometry can be approximated as a current sheet. For the magneto tail, the KAW from reconnection will not damp away before propagating the approximately 20 Earth radii associated with global magneto tail distances. For the solar corona, on the other hand, these KAWs will completely damp before reachingmore » the distances comparable to the flare loop length.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Department of Physics and Astronomy, University of Delaware, Newark DE USA
  2. University of Maryland, College Park MD USA
  3. Department of Physics and Astronomy, West Virginia University, Morgantown WV USA
  4. Space Science Institute, Boulder CO USA
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory-National Energy Research Scientific Computing Center
Sponsoring Org.:
USDOE
OSTI Identifier:
1461626
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 123; Journal Issue: 1; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English

Citation Formats

Sharma Pyakurel, P., Shay, M. A., Haggerty, C. C., Parashar, T. N., Drake, J. F., Cassak, P. A., and Gary, S. Peter. Super-Alfvénic Propagation and Damping of Reconnection Onset Signatures: RECONNECTION KAW DAMPING. United States: N. p., 2018. Web. doi:10.1002/2017JA024606.
Sharma Pyakurel, P., Shay, M. A., Haggerty, C. C., Parashar, T. N., Drake, J. F., Cassak, P. A., & Gary, S. Peter. Super-Alfvénic Propagation and Damping of Reconnection Onset Signatures: RECONNECTION KAW DAMPING. United States. doi:10.1002/2017JA024606.
Sharma Pyakurel, P., Shay, M. A., Haggerty, C. C., Parashar, T. N., Drake, J. F., Cassak, P. A., and Gary, S. Peter. Mon . "Super-Alfvénic Propagation and Damping of Reconnection Onset Signatures: RECONNECTION KAW DAMPING". United States. doi:10.1002/2017JA024606. https://www.osti.gov/servlets/purl/1461626.
@article{osti_1461626,
title = {Super-Alfvénic Propagation and Damping of Reconnection Onset Signatures: RECONNECTION KAW DAMPING},
author = {Sharma Pyakurel, P. and Shay, M. A. and Haggerty, C. C. and Parashar, T. N. and Drake, J. F. and Cassak, P. A. and Gary, S. Peter},
abstractNote = {The quadrupolar out-of-plane Hall magnetic leld generated during collisionless reconnection propagates away from the x line as a kinetic Alfvén wave (KAW). While it has been shown that this KAW carries substantial Poynting flux and propagates super-Alfvenically, how this KAW damps as it propagates away from the x line is not well understood. In this study, this damping is examined using kinetic particle-in-cell simulations of antiparallel symmetric magnetic reconnection in a one-dimensional current sheet equilibrium. In the reconnection simulations, the KAW wave vector has a typical magnitude comparable to an inverse fluid Larmor radius (effectively an inverse ion Larmor radius) and a direction of 85–89°relative to the local magnetic field. We find that the damping of the reconnection KAW is consistent with linear Landau damping results from a numerical Vlasov dispersion solver. This knowledge allows us to generalize our damping predictions to regions in the magnetotail and solar corona where the magnetic geometry can be approximated as a current sheet. For the magneto tail, the KAW from reconnection will not damp away before propagating the approximately 20 Earth radii associated with global magneto tail distances. For the solar corona, on the other hand, these KAWs will completely damp before reaching the distances comparable to the flare loop length.},
doi = {10.1002/2017JA024606},
journal = {Journal of Geophysical Research. Space Physics},
number = 1,
volume = 123,
place = {United States},
year = {2018},
month = {1}
}

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