The Downwind Solar Wind: Model Comparison with Pioneer 10 Observations
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Univ Arizona, Lunar & Planetary LabIssue Date
2020-09-25
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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 LETTERSRights
© 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
2041-8205EISSN
2041-8213Version
Final published versionae974a485f413a2113503eed53cd6c53
10.3847/2041-8213/abb81e