{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:QLI7POLHPKOT5RNRYWYZBNU6KZ","short_pith_number":"pith:QLI7POLH","canonical_record":{"source":{"id":"1809.01618","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-09-05T16:53:48Z","cross_cats_sorted":[],"title_canon_sha256":"34ea4307e43949cd7628e21fd3ea1dfad9c3cfe43b2dfd30da3e9154e5699b63","abstract_canon_sha256":"a98085279f7b874e1759c4b426c51f17fb3c55aa935b4ced799cce4dbc200a6b"},"schema_version":"1.0"},"canonical_sha256":"82d1f7b9677a9d3ec5b1c5b190b69e5655b0bfac26b45e4a429981b70159d15f","source":{"kind":"arxiv","id":"1809.01618","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.01618","created_at":"2026-05-18T00:06:27Z"},{"alias_kind":"arxiv_version","alias_value":"1809.01618v1","created_at":"2026-05-18T00:06:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.01618","created_at":"2026-05-18T00:06:27Z"},{"alias_kind":"pith_short_12","alias_value":"QLI7POLHPKOT","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_16","alias_value":"QLI7POLHPKOT5RNR","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_8","alias_value":"QLI7POLH","created_at":"2026-05-18T12:32:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:QLI7POLHPKOT5RNRYWYZBNU6KZ","target":"record","payload":{"canonical_record":{"source":{"id":"1809.01618","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-09-05T16:53:48Z","cross_cats_sorted":[],"title_canon_sha256":"34ea4307e43949cd7628e21fd3ea1dfad9c3cfe43b2dfd30da3e9154e5699b63","abstract_canon_sha256":"a98085279f7b874e1759c4b426c51f17fb3c55aa935b4ced799cce4dbc200a6b"},"schema_version":"1.0"},"canonical_sha256":"82d1f7b9677a9d3ec5b1c5b190b69e5655b0bfac26b45e4a429981b70159d15f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:06:27.064014Z","signature_b64":"X2qwX+KRKtZZ01rUrC92phXBBLodSDzzcJo6E4wccMbnil4sqCBG+MzRiIVJmVqbh3T39EsxKpuj1S2+je8QAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"82d1f7b9677a9d3ec5b1c5b190b69e5655b0bfac26b45e4a429981b70159d15f","last_reissued_at":"2026-05-18T00:06:27.063283Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:06:27.063283Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1809.01618","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:06:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZZnDdoZNcLqp+DJQ87m3j8zriZUn+S70hHVVJ9pfS2NJs2VcIVMpXZ9pZgdIL0aLndd1M46Ki6UxRFdwvQ5oCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T19:18:40.555051Z"},"content_sha256":"4eb8c841bfa10334c84602417f601f78e1d259bd07c56831760f12b885b52ff0","schema_version":"1.0","event_id":"sha256:4eb8c841bfa10334c84602417f601f78e1d259bd07c56831760f12b885b52ff0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:QLI7POLHPKOT5RNRYWYZBNU6KZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Solar UV and X-Ray Spectral Diagnostics","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Giulio del Zanna, Helen E. Mason","submitted_at":"2018-09-05T16:53:48Z","abstract_excerpt":"X-Ray and Ultraviolet (UV) observations of the outer solar atmosphere have been used for many decades to measure the fundamental parameters of the solar plasma. This review focuses on the optically thin emission from the solar atmosphere, mostly found at UV and X-ray (XUV) wavelengths, and discusses some of the diagnostic methods that have been used to measure electron densities, electron temperatures, differential emission measure (DEM), and relative chemical abundances. We mainly focus on methods and results obtained from high-resolution spectroscopy, rather than broad-band imaging. However,"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.01618","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:06:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vAX1UrzZyusPozpwRuydPh92wtFnQWdfbJfJpaeHC8ZwYY4Qk3apxJ08Iv5nAzMeY3CMHYbEpfT3EQbS5QKKDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T19:18:40.555454Z"},"content_sha256":"fae30daf8317498c719e5add91464e513b6e51bf6e46958a7430874f4a335862","schema_version":"1.0","event_id":"sha256:fae30daf8317498c719e5add91464e513b6e51bf6e46958a7430874f4a335862"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QLI7POLHPKOT5RNRYWYZBNU6KZ/bundle.json","state_url":"https://pith.science/pith/QLI7POLHPKOT5RNRYWYZBNU6KZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QLI7POLHPKOT5RNRYWYZBNU6KZ/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-27T19:18:40Z","links":{"resolver":"https://pith.science/pith/QLI7POLHPKOT5RNRYWYZBNU6KZ","bundle":"https://pith.science/pith/QLI7POLHPKOT5RNRYWYZBNU6KZ/bundle.json","state":"https://pith.science/pith/QLI7POLHPKOT5RNRYWYZBNU6KZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QLI7POLHPKOT5RNRYWYZBNU6KZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:QLI7POLHPKOT5RNRYWYZBNU6KZ","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"a98085279f7b874e1759c4b426c51f17fb3c55aa935b4ced799cce4dbc200a6b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-09-05T16:53:48Z","title_canon_sha256":"34ea4307e43949cd7628e21fd3ea1dfad9c3cfe43b2dfd30da3e9154e5699b63"},"schema_version":"1.0","source":{"id":"1809.01618","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.01618","created_at":"2026-05-18T00:06:27Z"},{"alias_kind":"arxiv_version","alias_value":"1809.01618v1","created_at":"2026-05-18T00:06:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.01618","created_at":"2026-05-18T00:06:27Z"},{"alias_kind":"pith_short_12","alias_value":"QLI7POLHPKOT","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_16","alias_value":"QLI7POLHPKOT5RNR","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_8","alias_value":"QLI7POLH","created_at":"2026-05-18T12:32:46Z"}],"graph_snapshots":[{"event_id":"sha256:fae30daf8317498c719e5add91464e513b6e51bf6e46958a7430874f4a335862","target":"graph","created_at":"2026-05-18T00:06:27Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"X-Ray and Ultraviolet (UV) observations of the outer solar atmosphere have been used for many decades to measure the fundamental parameters of the solar plasma. This review focuses on the optically thin emission from the solar atmosphere, mostly found at UV and X-ray (XUV) wavelengths, and discusses some of the diagnostic methods that have been used to measure electron densities, electron temperatures, differential emission measure (DEM), and relative chemical abundances. We mainly focus on methods and results obtained from high-resolution spectroscopy, rather than broad-band imaging. However,","authors_text":"Giulio del Zanna, Helen E. Mason","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-09-05T16:53:48Z","title":"Solar UV and X-Ray Spectral Diagnostics"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.01618","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:4eb8c841bfa10334c84602417f601f78e1d259bd07c56831760f12b885b52ff0","target":"record","created_at":"2026-05-18T00:06:27Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"a98085279f7b874e1759c4b426c51f17fb3c55aa935b4ced799cce4dbc200a6b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-09-05T16:53:48Z","title_canon_sha256":"34ea4307e43949cd7628e21fd3ea1dfad9c3cfe43b2dfd30da3e9154e5699b63"},"schema_version":"1.0","source":{"id":"1809.01618","kind":"arxiv","version":1}},"canonical_sha256":"82d1f7b9677a9d3ec5b1c5b190b69e5655b0bfac26b45e4a429981b70159d15f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"82d1f7b9677a9d3ec5b1c5b190b69e5655b0bfac26b45e4a429981b70159d15f","first_computed_at":"2026-05-18T00:06:27.063283Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:06:27.063283Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"X2qwX+KRKtZZ01rUrC92phXBBLodSDzzcJo6E4wccMbnil4sqCBG+MzRiIVJmVqbh3T39EsxKpuj1S2+je8QAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:06:27.064014Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.01618","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4eb8c841bfa10334c84602417f601f78e1d259bd07c56831760f12b885b52ff0","sha256:fae30daf8317498c719e5add91464e513b6e51bf6e46958a7430874f4a335862"],"state_sha256":"cc1225f38107317614a4f9057ef66ee35c3116b961e96ab3eba17062b865f97f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1marH+wvYoi81/7YI+zUGYAOsvGEZJgKSaLKny/PgSK/mAx0dYNmEYXfl/iJIQh17FyTQxzG+v2TSCGmdv+bBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T19:18:40.557559Z","bundle_sha256":"86b6ecec101e280243c5cc20fb490b0b9374e7a237fa12ad0af13283f97c8a34"}}