{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:BTJTRKWEBWPLZJZYHON52D72VX","short_pith_number":"pith:BTJTRKWE","canonical_record":{"source":{"id":"1606.01730","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.space-ph","submitted_at":"2016-06-06T13:14:15Z","cross_cats_sorted":[],"title_canon_sha256":"62ca590614aa3098ae0c4dc327117efff5e93a1bf0965125a02e5515ca970784","abstract_canon_sha256":"935036c273c1cd8301be5d286d3e197c53d7ffc6cc375be3de719a04b096350b"},"schema_version":"1.0"},"canonical_sha256":"0cd338aac40d9ebca7383b9bdd0ffaadee8d5c247ef0a90d684653ebb5ae4c42","source":{"kind":"arxiv","id":"1606.01730","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1606.01730","created_at":"2026-05-18T01:12:53Z"},{"alias_kind":"arxiv_version","alias_value":"1606.01730v1","created_at":"2026-05-18T01:12:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1606.01730","created_at":"2026-05-18T01:12:53Z"},{"alias_kind":"pith_short_12","alias_value":"BTJTRKWEBWPL","created_at":"2026-05-18T12:30:09Z"},{"alias_kind":"pith_short_16","alias_value":"BTJTRKWEBWPLZJZY","created_at":"2026-05-18T12:30:09Z"},{"alias_kind":"pith_short_8","alias_value":"BTJTRKWE","created_at":"2026-05-18T12:30:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:BTJTRKWEBWPLZJZYHON52D72VX","target":"record","payload":{"canonical_record":{"source":{"id":"1606.01730","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.space-ph","submitted_at":"2016-06-06T13:14:15Z","cross_cats_sorted":[],"title_canon_sha256":"62ca590614aa3098ae0c4dc327117efff5e93a1bf0965125a02e5515ca970784","abstract_canon_sha256":"935036c273c1cd8301be5d286d3e197c53d7ffc6cc375be3de719a04b096350b"},"schema_version":"1.0"},"canonical_sha256":"0cd338aac40d9ebca7383b9bdd0ffaadee8d5c247ef0a90d684653ebb5ae4c42","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:12:53.708880Z","signature_b64":"hpIdemv6pwPzGkuMHD9hWT9EvfyMc2poWu+u3XclDw56VZNchLLKL9ZITFLpUJOENb6DfWQ8u4wDJRDh9LIGDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0cd338aac40d9ebca7383b9bdd0ffaadee8d5c247ef0a90d684653ebb5ae4c42","last_reissued_at":"2026-05-18T01:12:53.708514Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:12:53.708514Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1606.01730","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":"2026-05-18T01:12:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"98HII9hzAohdd5g720adKTyevwgzBLVhM4wqtp3zCflIIyVTdKmRZSzg7gnO4HKNIjG8dzOGBul4HA+XJbz+Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T22:09:14.483073Z"},"content_sha256":"04f994c883dbc9e3f9dfba15bb6d65b3e2bbee2060c2e2199705e0c8bb1b2709","schema_version":"1.0","event_id":"sha256:04f994c883dbc9e3f9dfba15bb6d65b3e2bbee2060c2e2199705e0c8bb1b2709"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:BTJTRKWEBWPLZJZYHON52D72VX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"What is the appropriate coordinate system for magnetometer data when analyzing ionospheric currents?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.space-ph","authors_text":"J.W. Gjerloev, K.M. Laundal","submitted_at":"2016-06-06T13:14:15Z","abstract_excerpt":"In this paper we investigate which coordinate representation is most appropriate when analyzing ground magnetometer data in terms of ionospheric currents, in particular the westward electrojet. The $\\textit{AL}$ and the recently introduced $\\textit{SML}$ index are frequently used as monitors of the westward electrojet. Both indices are based on ground magnetometers at auroral latitudes. From these magnetometers, the largest perturbation in the southward direction is selected as the $\\textit{ AL/SML }$ index at 1 min cadence. The southward component is defined as antiparallel to the orientation"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1606.01730","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":"2026-05-18T01:12:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zhltpNzY5WTEjFC/WFTTDvUzSWjghaAVRLePyc/sTi9ZlkVFJZZc+R0BuExbBGAtbAazh0bOs/Vf2l7S0RLBAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T22:09:14.483437Z"},"content_sha256":"3b71d725a38d52ca03b9f88f2e06946fe2814b394e14d88149121df4cf610d82","schema_version":"1.0","event_id":"sha256:3b71d725a38d52ca03b9f88f2e06946fe2814b394e14d88149121df4cf610d82"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BTJTRKWEBWPLZJZYHON52D72VX/bundle.json","state_url":"https://pith.science/pith/BTJTRKWEBWPLZJZYHON52D72VX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BTJTRKWEBWPLZJZYHON52D72VX/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":"2026-06-03T22:09:14Z","links":{"resolver":"https://pith.science/pith/BTJTRKWEBWPLZJZYHON52D72VX","bundle":"https://pith.science/pith/BTJTRKWEBWPLZJZYHON52D72VX/bundle.json","state":"https://pith.science/pith/BTJTRKWEBWPLZJZYHON52D72VX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BTJTRKWEBWPLZJZYHON52D72VX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:BTJTRKWEBWPLZJZYHON52D72VX","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":"935036c273c1cd8301be5d286d3e197c53d7ffc6cc375be3de719a04b096350b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.space-ph","submitted_at":"2016-06-06T13:14:15Z","title_canon_sha256":"62ca590614aa3098ae0c4dc327117efff5e93a1bf0965125a02e5515ca970784"},"schema_version":"1.0","source":{"id":"1606.01730","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1606.01730","created_at":"2026-05-18T01:12:53Z"},{"alias_kind":"arxiv_version","alias_value":"1606.01730v1","created_at":"2026-05-18T01:12:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1606.01730","created_at":"2026-05-18T01:12:53Z"},{"alias_kind":"pith_short_12","alias_value":"BTJTRKWEBWPL","created_at":"2026-05-18T12:30:09Z"},{"alias_kind":"pith_short_16","alias_value":"BTJTRKWEBWPLZJZY","created_at":"2026-05-18T12:30:09Z"},{"alias_kind":"pith_short_8","alias_value":"BTJTRKWE","created_at":"2026-05-18T12:30:09Z"}],"graph_snapshots":[{"event_id":"sha256:3b71d725a38d52ca03b9f88f2e06946fe2814b394e14d88149121df4cf610d82","target":"graph","created_at":"2026-05-18T01:12:53Z","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":"In this paper we investigate which coordinate representation is most appropriate when analyzing ground magnetometer data in terms of ionospheric currents, in particular the westward electrojet. The $\\textit{AL}$ and the recently introduced $\\textit{SML}$ index are frequently used as monitors of the westward electrojet. Both indices are based on ground magnetometers at auroral latitudes. From these magnetometers, the largest perturbation in the southward direction is selected as the $\\textit{ AL/SML }$ index at 1 min cadence. The southward component is defined as antiparallel to the orientation","authors_text":"J.W. Gjerloev, K.M. Laundal","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.space-ph","submitted_at":"2016-06-06T13:14:15Z","title":"What is the appropriate coordinate system for magnetometer data when analyzing ionospheric currents?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1606.01730","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":"sha256:04f994c883dbc9e3f9dfba15bb6d65b3e2bbee2060c2e2199705e0c8bb1b2709","target":"record","created_at":"2026-05-18T01:12:53Z","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":"935036c273c1cd8301be5d286d3e197c53d7ffc6cc375be3de719a04b096350b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.space-ph","submitted_at":"2016-06-06T13:14:15Z","title_canon_sha256":"62ca590614aa3098ae0c4dc327117efff5e93a1bf0965125a02e5515ca970784"},"schema_version":"1.0","source":{"id":"1606.01730","kind":"arxiv","version":1}},"canonical_sha256":"0cd338aac40d9ebca7383b9bdd0ffaadee8d5c247ef0a90d684653ebb5ae4c42","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0cd338aac40d9ebca7383b9bdd0ffaadee8d5c247ef0a90d684653ebb5ae4c42","first_computed_at":"2026-05-18T01:12:53.708514Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:12:53.708514Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hpIdemv6pwPzGkuMHD9hWT9EvfyMc2poWu+u3XclDw56VZNchLLKL9ZITFLpUJOENb6DfWQ8u4wDJRDh9LIGDw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:12:53.708880Z","signed_message":"canonical_sha256_bytes"},"source_id":"1606.01730","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:04f994c883dbc9e3f9dfba15bb6d65b3e2bbee2060c2e2199705e0c8bb1b2709","sha256:3b71d725a38d52ca03b9f88f2e06946fe2814b394e14d88149121df4cf610d82"],"state_sha256":"9791bb37492639695bba13eebab3e92a4959613e2f4785cb4d75b708ec35e4c6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UFaa9hG/ajnyQOZdt18kHU4ZdJ2leQD6X3rN8wrQOD9h7vwmAwORuT0NecSxbDD0xba41n75tqWj6VwIZ+nsBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T22:09:14.485531Z","bundle_sha256":"b7870c41c83ab9206dad8643bceddbea96a8892941037b59b0c68c3dc5d2ea99"}}