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Vial","submitted_at":"2009-06-07T16:28:31Z","abstract_excerpt":"Context: The sharp temperature and density gradients in the coronal transition region are a challenge for models and observations.\n  Aims: We set out to get linearly- and quadratically-weighted average electron densities in the region emitting the S VI lines, using the observed opacity and the emission measure of these lines.\n  Methods: We analyze SoHO/SUMER spectroscopic observations of the S VI lines, using the center-to-limb variations and radiance ratios to derive the opacity. We also use the Emission Measure derived from radiance at disk center.\n  Results: We get an opacity at S VI line c"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"0906.1367","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/3.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-06-07T16:28:31Z","cross_cats_sorted":[],"title_canon_sha256":"844f818dc19e18131cb893657a8674f3f9897efec6d441a9707b16eaa42ee90c","abstract_canon_sha256":"df109f48ba13290670d80fd701e05e41ac6e17e4408e9fd75f5e0654bd85bbac"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:13:28.366333Z","signature_b64":"hpsemscIyz38bCw6fb3nSpS3oG76hTR4WIFbnSG2xI+DL3IvTqdPVv9zn2RhDB36KtPSd7xBZbtPUflFm4FIDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3e98658c446d6240b494157fdcaf75e75806f0a7ce2ce6fbefd25fe0f5343775","last_reissued_at":"2026-05-18T02:13:28.365706Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:13:28.365706Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Electron density in the quiet solar coronal transition region from SoHO/SUMER measurements of S VI line radiance and opacity","license":"http://creativecommons.org/licenses/by/3.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"E. 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