{"paper":{"title":"Observations of the 2019 April 4 Solar Energetic Particle Event at the Parker Solar Probe","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.space-ph"],"primary_cat":"astro-ph.SR","authors_text":"A. C. Cummings, A. J. Davis, A. Posner, A. Vourlidas, A. W. Case, A. W. Labrador, B. Poduval, C. J. Joyce, C. M. S. Cohen, D. G. Mitchell, D. J. McComas, E. C. Roelof, E. C. Stone, E. R. Christian, J. C. Kasper, J. Giacalone, J. R. Szalay, J. S. Rankin, K. E. Korreck, M. E. Hill, M. E. Wiedenbeck, M. I. Desai, M. L. Stevens, M. Pulupa, N. A. Schwadron, O. Malandraki, P. Whittlesey, R. A. Leske, R. A. Mewaldt, R. C. Allen, R. J. MacDowall, R. Livi, R. L. McNutt Jr., S. D. Bale, S. M. Krimigis, W. H. Matthaeus","submitted_at":"2019-12-06T23:12:38Z","abstract_excerpt":"A solar energetic particle event was detected by the Integrated Science Investigation of the Sun (ISOIS) instrument suite on Parker Solar Probe (PSP) on 2019 April 4 when the spacecraft was inside of 0.17 au and less than 1 day before its second perihelion, providing an opportunity to study solar particle acceleration and transport unprecedentedly close to the source. The event was very small, with peak 1 MeV proton intensities of ~0.3 particles (cm^2 sr s MeV)^-1, and was undetectable above background levels at energies above 10 MeV or in particle detectors at 1 au. It was strongly anisotropi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1912.03384","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1912.03384/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}