{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:4KACZISFHZ3WOPESHEIV673QHB","short_pith_number":"pith:4KACZISF","canonical_record":{"source":{"id":"1005.1774","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-05-11T09:28:24Z","cross_cats_sorted":[],"title_canon_sha256":"24b9d189ae6e359b047e3749685ca65d33ae0229f88ef5a3decf4080610cfa2e","abstract_canon_sha256":"3aa234800ec28f0a42fb8f17458053de734e40455f0bb9d3bac712526b05dbef"},"schema_version":"1.0"},"canonical_sha256":"e2802ca2453e77673c9239115f7f70387e7ddbf8ed342baed4577ff65ca1978f","source":{"kind":"arxiv","id":"1005.1774","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1005.1774","created_at":"2026-05-18T02:07:34Z"},{"alias_kind":"arxiv_version","alias_value":"1005.1774v1","created_at":"2026-05-18T02:07:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1005.1774","created_at":"2026-05-18T02:07:34Z"},{"alias_kind":"pith_short_12","alias_value":"4KACZISFHZ3W","created_at":"2026-05-18T12:26:03Z"},{"alias_kind":"pith_short_16","alias_value":"4KACZISFHZ3WOPES","created_at":"2026-05-18T12:26:03Z"},{"alias_kind":"pith_short_8","alias_value":"4KACZISF","created_at":"2026-05-18T12:26:03Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:4KACZISFHZ3WOPESHEIV673QHB","target":"record","payload":{"canonical_record":{"source":{"id":"1005.1774","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-05-11T09:28:24Z","cross_cats_sorted":[],"title_canon_sha256":"24b9d189ae6e359b047e3749685ca65d33ae0229f88ef5a3decf4080610cfa2e","abstract_canon_sha256":"3aa234800ec28f0a42fb8f17458053de734e40455f0bb9d3bac712526b05dbef"},"schema_version":"1.0"},"canonical_sha256":"e2802ca2453e77673c9239115f7f70387e7ddbf8ed342baed4577ff65ca1978f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:07:34.403783Z","signature_b64":"nUdpF8JYF8Cb0Xk2H+kokDcJcLRH7siZ7Fq+AJs5mZ8Iwh7EoK8V5TG0HmiZ6+P+XUc8NxoFTKrVMZdmvTV7Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e2802ca2453e77673c9239115f7f70387e7ddbf8ed342baed4577ff65ca1978f","last_reissued_at":"2026-05-18T02:07:34.402901Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:07:34.402901Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1005.1774","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":"2026-05-18T02:07:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HN4l/Y0EAHzNfxhL2+pAamBbJ+IbJTQOgMd67cIFEaLjRRhGR/3CRDgo+cVG275FjzJwF1B/1bYyWU+DMxVCDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T09:51:21.648541Z"},"content_sha256":"961521a957da4b84dfb24f44f2ab8947630a24e7dfe9a116fd04792e8b4184eb","schema_version":"1.0","event_id":"sha256:961521a957da4b84dfb24f44f2ab8947630a24e7dfe9a116fd04792e8b4184eb"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:4KACZISFHZ3WOPESHEIV673QHB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Sunspot group tilt angles and the strength of the solar cycle","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Maria Dasi-Espuig, Natasha A. Krivova, Robert H. Cameron, Sami K. Solanki, Tania Pe\\~nuela","submitted_at":"2010-05-11T09:28:24Z","abstract_excerpt":"It is known that the tilt angles of active regions increase with their latitude (Joy's law). It has never been checked before, however, whether the average tilt angles change from one cycle to another. Flux transport models show the importance of tilt angles for the reversal and build up of magnetic flux at the poles which is, in turn, correlated with the strength of the next cycle. Here we analyse time series of tilt angle measurements and look for a possible relationship of the tilt angles with other solar cycle parameters, in order to glean information on the solar dynamo and to estimate th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1005.1774","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":"2026-05-18T02:07:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QQ9Ue+8u3dU72txckAemxAkgCi34C34hbJq8WGu5FQ310a7ZaxZmgzz5xibrFnvvv/EwoDHnAA4r3egbIranDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T09:51:21.649195Z"},"content_sha256":"2b9361935d578e8f68ddc9bee9423965c834c1c2c8f5d6d7c1993b95cc8e5daf","schema_version":"1.0","event_id":"sha256:2b9361935d578e8f68ddc9bee9423965c834c1c2c8f5d6d7c1993b95cc8e5daf"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4KACZISFHZ3WOPESHEIV673QHB/bundle.json","state_url":"https://pith.science/pith/4KACZISFHZ3WOPESHEIV673QHB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4KACZISFHZ3WOPESHEIV673QHB/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":"2026-05-20T09:51:21Z","links":{"resolver":"https://pith.science/pith/4KACZISFHZ3WOPESHEIV673QHB","bundle":"https://pith.science/pith/4KACZISFHZ3WOPESHEIV673QHB/bundle.json","state":"https://pith.science/pith/4KACZISFHZ3WOPESHEIV673QHB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4KACZISFHZ3WOPESHEIV673QHB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:4KACZISFHZ3WOPESHEIV673QHB","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":"3aa234800ec28f0a42fb8f17458053de734e40455f0bb9d3bac712526b05dbef","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-05-11T09:28:24Z","title_canon_sha256":"24b9d189ae6e359b047e3749685ca65d33ae0229f88ef5a3decf4080610cfa2e"},"schema_version":"1.0","source":{"id":"1005.1774","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1005.1774","created_at":"2026-05-18T02:07:34Z"},{"alias_kind":"arxiv_version","alias_value":"1005.1774v1","created_at":"2026-05-18T02:07:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1005.1774","created_at":"2026-05-18T02:07:34Z"},{"alias_kind":"pith_short_12","alias_value":"4KACZISFHZ3W","created_at":"2026-05-18T12:26:03Z"},{"alias_kind":"pith_short_16","alias_value":"4KACZISFHZ3WOPES","created_at":"2026-05-18T12:26:03Z"},{"alias_kind":"pith_short_8","alias_value":"4KACZISF","created_at":"2026-05-18T12:26:03Z"}],"graph_snapshots":[{"event_id":"sha256:2b9361935d578e8f68ddc9bee9423965c834c1c2c8f5d6d7c1993b95cc8e5daf","target":"graph","created_at":"2026-05-18T02:07:34Z","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":"It is known that the tilt angles of active regions increase with their latitude (Joy's law). It has never been checked before, however, whether the average tilt angles change from one cycle to another. Flux transport models show the importance of tilt angles for the reversal and build up of magnetic flux at the poles which is, in turn, correlated with the strength of the next cycle. Here we analyse time series of tilt angle measurements and look for a possible relationship of the tilt angles with other solar cycle parameters, in order to glean information on the solar dynamo and to estimate th","authors_text":"Maria Dasi-Espuig, Natasha A. Krivova, Robert H. Cameron, Sami K. Solanki, Tania Pe\\~nuela","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-05-11T09:28:24Z","title":"Sunspot group tilt angles and the strength of the solar cycle"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1005.1774","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":"sha256:961521a957da4b84dfb24f44f2ab8947630a24e7dfe9a116fd04792e8b4184eb","target":"record","created_at":"2026-05-18T02:07:34Z","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":"3aa234800ec28f0a42fb8f17458053de734e40455f0bb9d3bac712526b05dbef","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-05-11T09:28:24Z","title_canon_sha256":"24b9d189ae6e359b047e3749685ca65d33ae0229f88ef5a3decf4080610cfa2e"},"schema_version":"1.0","source":{"id":"1005.1774","kind":"arxiv","version":1}},"canonical_sha256":"e2802ca2453e77673c9239115f7f70387e7ddbf8ed342baed4577ff65ca1978f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e2802ca2453e77673c9239115f7f70387e7ddbf8ed342baed4577ff65ca1978f","first_computed_at":"2026-05-18T02:07:34.402901Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:07:34.402901Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nUdpF8JYF8Cb0Xk2H+kokDcJcLRH7siZ7Fq+AJs5mZ8Iwh7EoK8V5TG0HmiZ6+P+XUc8NxoFTKrVMZdmvTV7Bw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:07:34.403783Z","signed_message":"canonical_sha256_bytes"},"source_id":"1005.1774","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:961521a957da4b84dfb24f44f2ab8947630a24e7dfe9a116fd04792e8b4184eb","sha256:2b9361935d578e8f68ddc9bee9423965c834c1c2c8f5d6d7c1993b95cc8e5daf"],"state_sha256":"4d87d1b2b5156167f015c296a992af996e064c238ac996775b3c64a2c45f1247"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NAZ+DeZEIK04pEsmCi2E16qU99azwCvwuQBneMrPjtmi30+N9o5WQBaeeL0p0sk1i6WQZps3+7feNzBroF0WAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-20T09:51:21.652025Z","bundle_sha256":"724727821df3d7e1f13a4cfd30f55700c3a75e416978a5010372cc6b4ce48f37"}}