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Comparative Study of the Solar Wind: Modeling Charge State Distributions in the Heliosphere

Dupont, Marcus


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        <foaf:name>Dupont, Marcus</foaf:name>
        <foaf:givenName>Marcus</foaf:givenName>
        <foaf:familyName>Dupont</foaf:familyName>
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            <foaf:name>Florida State University</foaf:name>
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    <dct:title>Comparative Study of the Solar Wind: Modeling Charge State Distributions in the Heliosphere</dct:title>
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    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#gYear">2018</dct:issued>
    <dcat:keyword>Solar Wind</dcat:keyword>
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        <foaf:name>Shen, Chengcai</foaf:name>
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        <foaf:name>Murphy, Nick</foaf:name>
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    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2018-11-13</dct:issued>
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    <dct:description>&lt;p&gt;Non-equilibrium ionization (NEI) is a key process often times ignored when modeling astrophysical&amp;nbsp;plasmas whose thermodynamical timescales are much shorter than the timescales for ionization&amp;nbsp;and recombination. In this paper, we use magnetohydrodynamics (MHD) models alongside numerical NEI simulations to calculate synthetic charge state distributions during the Whole Sun&amp;nbsp;Month interval (CR)-1913 (1996, 22 August to 1996, 18 September), and compare them with in-situ measurements made with the Ulysses Solar Wind Ion Spectrometer Composition (SWICS)&amp;nbsp;instrument. The key ndings of our analysis have: (1) shown that the solar wind speeds at 20 R&lt;sub&gt;s&lt;/sub&gt;&amp;nbsp;calculated by the &lt;em&gt;Magnetohydrodynamics Around a Sphere&lt;/em&gt; (MAS) model were not in agreement&amp;nbsp;with the Ulysses observations; (2) measured the &amp;quot;freeze-in&amp;quot;&amp;nbsp;distance for each ion observed by the&amp;nbsp;SWICS instrument to determine a possible correlation between when the ionization states become fixed and their expansion into the solar wind; (3) shown how di erent charge state densities and&amp;nbsp;abundance ratios compared with observation.&lt;/p&gt;</dct:description>
    <dct:description xml:lang="">This work supported by NSF SHINE Grant AGS-1723313.</dct:description>
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