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  <gcmd:gcmd>
    <gcmd:termsOfUse>https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf</gcmd:termsOfUse>
    <gcmd:keywordVersion>23.7</gcmd:keywordVersion>
    <gcmd:schemeVersion>2026-04-15T10:53:30.610Z</gcmd:schemeVersion>
    <gcmd:viewer>https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/a2443978-118d-4f7c-843d-dcd0059fe949</gcmd:viewer>
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  <skos:Concept rdf:about="a2443978-118d-4f7c-843d-dcd0059fe949">
    <skos:broader rdf:resource="cad91f82-7e2a-43b7-b272-2dc77e2791f4"/>
    <skos:prefLabel xml:lang="en">PROTON FLUX</skos:prefLabel>
    <gcmd:reference gcmd:text="Jursa, A.S., ed. 1985. Handbook of Geophysics and the Space Enviornment, Air Force Geophysics Laboratory, USAF. (Available from NTIS, Springfield, VA).  &lt;B&gt;" xml:lang="en"/>
    <skos:definition xml:lang="en">The rate of flow of protons through a reference surface, measured in particlesper unit area.</skos:definition>
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