{"paper":{"title":"Umbral Fine Structures in Sunspots Observed with Hinode Solar Optical Telescope","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Alan M. Title, Bruce W. Lites, Hiroko Watanabe, Kazunari Shibata, Ken-ichi Otsuji, Kiyoshi Ichimoto, Reizaburo Kitai, Richard A. Shine, Richard Muller, Saku Tsuneta, Satoru UeNo, Shin-ichi Nagata, Tahei Nakamura, Takuma Matsumoto, Theodore D. Tarbell, Toshifumi Shimizu, Yoshinori Suematsu, Yukio Katsukawa","submitted_at":"2007-11-21T07:37:02Z","abstract_excerpt":"High resolution imaging observation of a sunspot umbra was done with Hinode Solar Optical Telescope (SOT). Filtergrams in wavelengths of blue and green continuum were taken during three consecutive days. The umbra consisted of a dark core region, several diffuse components and numerous umbral dots. We derived basic properties of umbral dots (UDs), especially their temperatures, lifetimes, proper motions, spatial distribution and morphological evolution. Brightness of UDs is confirmed to depend on the brightness of their surrounding background. Several UDs show fission and fusion. Thanks to the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0711.3266","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":""},"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"}