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    Radial Evolution of Stochastic Heating in Low-β Solar Wind

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    Martinović_2019_ApJ_879_43.pdf
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    Author
    Martinović, Mihailo M.
    Klein, Kristopher G. cc
    Bourouaine, Sofiane
    Affiliation
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2019-07
    Keywords
    plasmas
    solar wind
    turbulence
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Martinovic, M. M., Klein, K. G., & Bourouaine, S. (2019). Radial Evolution of Stochastic Heating in Low-β Solar Wind. arXiv preprint arXiv:1905.13355.
    Journal
    ASTROPHYSICAL JOURNAL
    Rights
    © 2019. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We consider the radial evolution of perpendicular ion heating due to the violation of magnetic moment conservation caused by Alfven and kinetic Alfven wave turbulence. This process, referred to as stochastic heating (SH), can be quantified by the ratio between the average velocity fluctuations at the ion gyroradius and the perpendicular ion thermal speed epsilon delta v/v(t perpendicular to). Using 17 yr of Helios observations, we constrain how much energy could be dissipated by this mechanism between 0.29 and 0.98 au. We find that SH likely operates throughout the entire inner heliosphere, but that its radial dependence is steeper than that of empirically derived dissipation rates, with r(-2.5) being compared with r(-2.08). This difference is significantly increased in fast solar wind streams to r(-3.1) compared with r(-1.8).
    ISSN
    0004-637X
    EISSN
    1538-4357
    DOI
    10.3847/1538-4357/ab23f4
    Version
    Final published version
    Sponsors
    Ministry of Education, Science and Technological Development of Republic of Serbia [ON176002]; NASA [NNX16AM23G]
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/ab23f4
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    UA Faculty Publications

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