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Title: EVIDENCE FOR INHOMOGENEOUS HEATING IN THE SOLAR WIND

Abstract

Solar wind observations and magnetohydrodynamic (MHD) simulations are used to probe the nature of turbulence heating. In particular, the electron heat flux, electron temperature, and ion temperature in the solar wind are studied using ACE and Wind data. These heating diagnostics are also compared with MHD simulation estimates of the local dissipation density. Coherent structures, which are sources of inhomogeneity and intermittency in MHD turbulence, are found to be associated with enhancements in every heating-related diagnostic. This supports the hypothesis that significant inhomogeneous heating occurs in the solar wind, connected with current sheets that are dynamically generated by MHD turbulence. Indeed, a subset of these coherent current sheets might be candidates for magnetic reconnection. However, the specific kinetic mechanisms that heat and accelerate particles within these structures require further study.

Authors:
;  [1]; ;  [2]
  1. Bartol Research Institute, Department of Physics and Astronomy, University of Delaware, DE 19716 (United States)
  2. Dipartimento di Fisica, Universita della Calabria, I-87036 Cosenza (Italy)
Publication Date:
OSTI Identifier:
21560559
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 727; Journal Issue: 1; Other Information: DOI: 10.1088/2041-8205/727/1/L11; Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ELECTRON TEMPERATURE; ELECTRONS; HEAT FLUX; HEATING; ION TEMPERATURE; MAGNETIC RECONNECTION; MAGNETOHYDRODYNAMICS; SIMULATION; SOLAR WIND; TURBULENCE; ELEMENTARY PARTICLES; FERMIONS; FLUID MECHANICS; HYDRODYNAMICS; LEPTONS; MECHANICS; SOLAR ACTIVITY; STELLAR ACTIVITY; STELLAR WINDS

Citation Formats

Osman, K. T., Matthaeus, W. H., Greco, A., and Servidio, S., E-mail: kto@udel.edu. EVIDENCE FOR INHOMOGENEOUS HEATING IN THE SOLAR WIND. United States: N. p., 2011. Web. doi:10.1088/2041-8205/727/1/L11.
Osman, K. T., Matthaeus, W. H., Greco, A., & Servidio, S., E-mail: kto@udel.edu. EVIDENCE FOR INHOMOGENEOUS HEATING IN THE SOLAR WIND. United States. doi:10.1088/2041-8205/727/1/L11.
Osman, K. T., Matthaeus, W. H., Greco, A., and Servidio, S., E-mail: kto@udel.edu. Thu . "EVIDENCE FOR INHOMOGENEOUS HEATING IN THE SOLAR WIND". United States. doi:10.1088/2041-8205/727/1/L11.
@article{osti_21560559,
title = {EVIDENCE FOR INHOMOGENEOUS HEATING IN THE SOLAR WIND},
author = {Osman, K. T. and Matthaeus, W. H. and Greco, A. and Servidio, S., E-mail: kto@udel.edu},
abstractNote = {Solar wind observations and magnetohydrodynamic (MHD) simulations are used to probe the nature of turbulence heating. In particular, the electron heat flux, electron temperature, and ion temperature in the solar wind are studied using ACE and Wind data. These heating diagnostics are also compared with MHD simulation estimates of the local dissipation density. Coherent structures, which are sources of inhomogeneity and intermittency in MHD turbulence, are found to be associated with enhancements in every heating-related diagnostic. This supports the hypothesis that significant inhomogeneous heating occurs in the solar wind, connected with current sheets that are dynamically generated by MHD turbulence. Indeed, a subset of these coherent current sheets might be candidates for magnetic reconnection. However, the specific kinetic mechanisms that heat and accelerate particles within these structures require further study.},
doi = {10.1088/2041-8205/727/1/L11},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 1,
volume = 727,
place = {United States},
year = {2011},
month = {1}
}