{
  "abstract": "Spacecraft structure is usually treated as shielding against energetic particles. We find that the Sun can reverse the effect of adding that structure. Free-falling test masses are the inertial references of gravitational-wave observatories and equivalence-principle experiments; charge accumulated on them couples to stray electric fields and produces acceleration noise that limits sensitivity. In a LISA-like system, increasing the surrounding aluminium from 16 to 24 g cm -2 reduces the stopping-proton population by (2.3 ± 0.5)% at solar minimum but increases it by (17.0 ± 1.0)% at solar maximum, the crossover lying in the deep-solar-minimum regime. Complete 2-24 g cm -2 mass curves show a broad maximum at solar minimum but a monotonic rise at maximum. The reversal arises because added material both attenuates incident protons and feeds a nuclear-processed population into the stopping-energy window. A first-order projection onto published charging rates gives changes of about -2% and +11% in the net charging rate, affecting charge accumulation, discharge requirements and the associated noise budget. The sign of a structural trade is therefore not fixed by the structure alone.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.24851",
  "author_total": 2,
  "authors": [
    {
      "name": "Yasser Maghrbi"
    },
    {
      "name": "Nelson Christensen"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/673s7wxk4gggk.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.24851",
  "fulltext_url": null,
  "id": "673s7wxk4gggk",
  "issns": [],
  "landing_url": "https://hal.science/hal-05756091v1",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
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      "astro-ph.IM"
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  "openalex": "W7214021985",
  "pdf_url": "https://hal.science/hal-05756091/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-21",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/673s7wxk4gggk.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:36Z",
      "native_id": "hal-05756091",
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      "url": "https://hal.science/hal-05756091v1"
    },
    {
      "first_seen": "2026-10-30T12:23:19Z",
      "native_id": "2609.24851",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.24851"
    }
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  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.IM",
      "subfield": "instrumentation-methods"
    },
    {
      "field": "earth",
      "origin": "hal:0.sdu",
      "subfield": "general"
    }
  ],
  "title": "The Sun can flip the shielding effect of added spacecraft mass",
  "title_text": "The Sun can flip the shielding effect of added spacecraft mass",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:19Z",
  "url": "https://research.draconitic.com/paper/673s7wxk4gggk",
  "venue": "HAL",
  "versions": []
}