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    The Downwind Solar Wind: Model Comparison with Pioneer 10 Observations

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    Nakanotani_2020_ApJL_901_L23.pdf
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    Author
    Nakanotani, M.
    Zank, G. P.
    Adhikari, L.
    Zhao, L.-L. cc
    Giacalone, J.
    Opher, M.
    Richardson, J. D.
    Affiliation
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2020-09-25
    Keywords
    Solar wind
    Solar physics
    Magnetohydrodynamics
    Pickup ions
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Nakanotani, M., Zank, G. P., Adhikari, L., Zhao, L. L., Giacalone, J., Opher, M., & Richardson, J. D. (2020). The Downwind Solar Wind: Model Comparison with Pioneer 10 Observations. The Astrophysical Journal Letters, 901(2), L23.
    Journal
    ASTROPHYSICAL JOURNAL LETTERS
    Rights
    © 2020. 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
    The solar wind in the upwind region has been well modeled using a pickup ion (PUI) mediated MHD model (Zank et al.). It suggests that PUIs have an important role in heating the solar wind in the outer heliosphere. However, the solar wind in the downwind region is not as well understood. Here, we compare the Zank et al. model with Pioneer 10 observations, which allows us to investigate the downwind solar wind out to 60 au. We use a model in which the hydrogen temperature is finite to obtain a proper hydrogen number density distribution in the downwind region and incorporate it into the model. Our results explain Pioneer 10 observations well and indicate that the heating due to PUIs is less effective than in the upwind region since the density of PUIs in the downwind region is less than the upwind PUIs density. We also derive parameters at several possible locations of the downwind termination shock.
    ISSN
    2041-8205
    EISSN
    2041-8213
    DOI
    10.3847/2041-8213/abb81e
    Version
    Final published version
    ae974a485f413a2113503eed53cd6c53
    10.3847/2041-8213/abb81e
    Scopus Count
    Collections
    UA Faculty Publications

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