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In this study, we perform numerical simulations mimicking an idealized three\u2010phase geomagnetic storm to investigate the role of heavy ion composition in the ring current (O<jats:sup>+<\/jats:sup> vs. N<jats:sup>+<\/jats:sup>) and exospheric neutral hydrogen density in the production of cold H<jats:sup>+<\/jats:sup> via charge exchange reactions. It is found that ring current heavy ions produce more than 50% of the total cold H<jats:sup>+<\/jats:sup> via charge exchange reactions, and energetic N<jats:sup>+<\/jats:sup> is more efficient in producing cold H<jats:sup>+<\/jats:sup> via charge exchange reactions than O<jats:sup>+<\/jats:sup>. Furthermore, the density structure of the cold H<jats:sup>+<\/jats:sup> is highly dependent on the mass of the parent ion; that is, cold H<jats:sup>+<\/jats:sup> deriving from charge exchange reactions involving energetic O<jats:sup>+<\/jats:sup> with neutral hydrogen, populates the lower L\u2010shells, while cold H<jats:sup>+<\/jats:sup> deriving from charge exchange reactions involving energetic N<jats:sup>+<\/jats:sup> with neutral hydrogen populates the higher L\u2010shells. In addition, the density of cold H<jats:sup>+<\/jats:sup> produced via charge exchange reactions involving N<jats:sup>+<\/jats:sup> can be peak at values up to one order of magnitude larger than the local plasmaspheric density, suggesting that solely considering the supply of cold plasma from the ionosphere to the plasmasphere can lead to a significant underestimation of plasmasphere density.<\/jats:p>","DOI":"10.1029\/2022ja030619","type":"journal-article","created":{"date-parts":[[2022,9,29]],"date-time":"2022-09-29T11:44:50Z","timestamp":1664451890000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["A New Mechanism for Early\u2010Time Plasmaspheric Refilling: The Role of Charge Exchange Reactions in the Transport of Energy and Mass Throughout the Ring Current\u2014Plasmasphere System"],"prefix":"10.1029","volume":"127","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3307-4757","authenticated-orcid":false,"given":"Jianghuai","family":"Liu","sequence":"first","affiliation":[{"name":"Department of Electrical and Computer Engineering University of Illinois at Urbana\u2010Champaign  Urbana IL USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7305-2579","authenticated-orcid":false,"given":"Raluca","family":"Ilie","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering University of Illinois at Urbana\u2010Champaign  Urbana IL USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2325-3348","authenticated-orcid":false,"given":"Joseph E.","family":"Borovsky","sequence":"additional","affiliation":[{"name":"Space Science Institute  Boulder CO USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7039-2631","authenticated-orcid":false,"given":"Michael W.","family":"Liemohn","sequence":"additional","affiliation":[{"name":"Department of Climate and Space Science and Engineering University of Michigan  Ann Arbor MI USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"13","published-online":{"date-parts":[[2022,10,11]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1029\/2004JA010424"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1029\/2019JA027612"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1029\/2011JA016531"},{"key":"e_1_2_8_5_1","unstructured":"Bailey J. &Gruntman M.(2013).Experimental study of the asymmetric time varying exosphere by Lyman\u2010alpha detectors on the TWINS mission. 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