{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:YPOI7CJET52SRZJ2FO7H4NPK6T","short_pith_number":"pith:YPOI7CJE","canonical_record":{"source":{"id":"1411.7295","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-11-26T16:44:02Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"a4965940d96656ac4c5f2341b46eefa83e678fe45997670df8709b485c37c48c","abstract_canon_sha256":"708aa559eadb3368ae5433a6b21effa4cb2dfb926cf1715ee566a2b005007725"},"schema_version":"1.0"},"canonical_sha256":"c3dc8f89249f7528e53a2bbe7e35eaf4dcb4d6449893224d321d073e3afc8b69","source":{"kind":"arxiv","id":"1411.7295","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1411.7295","created_at":"2026-05-18T01:09:37Z"},{"alias_kind":"arxiv_version","alias_value":"1411.7295v2","created_at":"2026-05-18T01:09:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1411.7295","created_at":"2026-05-18T01:09:37Z"},{"alias_kind":"pith_short_12","alias_value":"YPOI7CJET52S","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_16","alias_value":"YPOI7CJET52SRZJ2","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_8","alias_value":"YPOI7CJE","created_at":"2026-05-18T12:28:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:YPOI7CJET52SRZJ2FO7H4NPK6T","target":"record","payload":{"canonical_record":{"source":{"id":"1411.7295","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-11-26T16:44:02Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"a4965940d96656ac4c5f2341b46eefa83e678fe45997670df8709b485c37c48c","abstract_canon_sha256":"708aa559eadb3368ae5433a6b21effa4cb2dfb926cf1715ee566a2b005007725"},"schema_version":"1.0"},"canonical_sha256":"c3dc8f89249f7528e53a2bbe7e35eaf4dcb4d6449893224d321d073e3afc8b69","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:09:37.137661Z","signature_b64":"kFJ0oc6vwLYLCWrztl/RRigJAIi/dn5S/QzMwEGD3aCkwPAv1utbup0j72p8ZkLfBrHedFdrnlr8vZIeDovEDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c3dc8f89249f7528e53a2bbe7e35eaf4dcb4d6449893224d321d073e3afc8b69","last_reissued_at":"2026-05-18T01:09:37.137273Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:09:37.137273Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1411.7295","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:09:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"owYbaKezyE53o/k1xsZRfmHd0W30GZcR5Vr3aRh9yf3w9ht7Ci52fxVj9TOMvbyMWsi3R7dPZwShL9ALNpuwAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T18:43:54.239690Z"},"content_sha256":"f808fc0ad63ff0b3c8ebf07ccaf87b111875e09ec98d00608c22f0feb4786943","schema_version":"1.0","event_id":"sha256:f808fc0ad63ff0b3c8ebf07ccaf87b111875e09ec98d00608c22f0feb4786943"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:YPOI7CJET52SRZJ2FO7H4NPK6T","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Feasibility of radar detection of extensive air showers","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.IM","authors_text":"F. Werner, H. Wilczy\\'nski, J. Stasielak, P. Neunteufel, R. Engel, R. \\v{S}m\\'ida, S. Baur","submitted_at":"2014-11-26T16:44:02Z","abstract_excerpt":"Reflection of radio waves off the short-lived plasma produced by the high-energy shower particles in the air is simulated, considering various radar setups and shower geometries. We show that the plasma produced by air showers has to be treated always as underdense. Therefore, we use the Thomson cross-section for scattering of radio waves corrected for molecular quenching and we sum coherently contributions of the reflected radio wave over the volume of the plasma disk to obtain the time evolution of the signal arriving at the receiver antenna. The received power and the spectral power density"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1411.7295","kind":"arxiv","version":2},"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":"2026-05-18T01:09:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RM+KGYrNUxSeqfVe9GWDxP8/VkH4L9wEsLow2RKXxkB9UB2v3d6pNZnlFp4KRsGHFM/FcFnkBLs1U8lRWSIGBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T18:43:54.240342Z"},"content_sha256":"f2c305ccf45e05e712bd4bd563c64903e8bc93bf3fb78349830eff3fefe34a94","schema_version":"1.0","event_id":"sha256:f2c305ccf45e05e712bd4bd563c64903e8bc93bf3fb78349830eff3fefe34a94"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YPOI7CJET52SRZJ2FO7H4NPK6T/bundle.json","state_url":"https://pith.science/pith/YPOI7CJET52SRZJ2FO7H4NPK6T/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YPOI7CJET52SRZJ2FO7H4NPK6T/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":"2026-05-28T18:43:54Z","links":{"resolver":"https://pith.science/pith/YPOI7CJET52SRZJ2FO7H4NPK6T","bundle":"https://pith.science/pith/YPOI7CJET52SRZJ2FO7H4NPK6T/bundle.json","state":"https://pith.science/pith/YPOI7CJET52SRZJ2FO7H4NPK6T/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YPOI7CJET52SRZJ2FO7H4NPK6T/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:YPOI7CJET52SRZJ2FO7H4NPK6T","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":"708aa559eadb3368ae5433a6b21effa4cb2dfb926cf1715ee566a2b005007725","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-11-26T16:44:02Z","title_canon_sha256":"a4965940d96656ac4c5f2341b46eefa83e678fe45997670df8709b485c37c48c"},"schema_version":"1.0","source":{"id":"1411.7295","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1411.7295","created_at":"2026-05-18T01:09:37Z"},{"alias_kind":"arxiv_version","alias_value":"1411.7295v2","created_at":"2026-05-18T01:09:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1411.7295","created_at":"2026-05-18T01:09:37Z"},{"alias_kind":"pith_short_12","alias_value":"YPOI7CJET52S","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_16","alias_value":"YPOI7CJET52SRZJ2","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_8","alias_value":"YPOI7CJE","created_at":"2026-05-18T12:28:57Z"}],"graph_snapshots":[{"event_id":"sha256:f2c305ccf45e05e712bd4bd563c64903e8bc93bf3fb78349830eff3fefe34a94","target":"graph","created_at":"2026-05-18T01:09:37Z","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":"Reflection of radio waves off the short-lived plasma produced by the high-energy shower particles in the air is simulated, considering various radar setups and shower geometries. We show that the plasma produced by air showers has to be treated always as underdense. Therefore, we use the Thomson cross-section for scattering of radio waves corrected for molecular quenching and we sum coherently contributions of the reflected radio wave over the volume of the plasma disk to obtain the time evolution of the signal arriving at the receiver antenna. The received power and the spectral power density","authors_text":"F. Werner, H. Wilczy\\'nski, J. Stasielak, P. Neunteufel, R. Engel, R. \\v{S}m\\'ida, S. Baur","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-11-26T16:44:02Z","title":"Feasibility of radar detection of extensive air showers"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1411.7295","kind":"arxiv","version":2},"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:f808fc0ad63ff0b3c8ebf07ccaf87b111875e09ec98d00608c22f0feb4786943","target":"record","created_at":"2026-05-18T01:09:37Z","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":"708aa559eadb3368ae5433a6b21effa4cb2dfb926cf1715ee566a2b005007725","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-11-26T16:44:02Z","title_canon_sha256":"a4965940d96656ac4c5f2341b46eefa83e678fe45997670df8709b485c37c48c"},"schema_version":"1.0","source":{"id":"1411.7295","kind":"arxiv","version":2}},"canonical_sha256":"c3dc8f89249f7528e53a2bbe7e35eaf4dcb4d6449893224d321d073e3afc8b69","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c3dc8f89249f7528e53a2bbe7e35eaf4dcb4d6449893224d321d073e3afc8b69","first_computed_at":"2026-05-18T01:09:37.137273Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:09:37.137273Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kFJ0oc6vwLYLCWrztl/RRigJAIi/dn5S/QzMwEGD3aCkwPAv1utbup0j72p8ZkLfBrHedFdrnlr8vZIeDovEDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:09:37.137661Z","signed_message":"canonical_sha256_bytes"},"source_id":"1411.7295","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f808fc0ad63ff0b3c8ebf07ccaf87b111875e09ec98d00608c22f0feb4786943","sha256:f2c305ccf45e05e712bd4bd563c64903e8bc93bf3fb78349830eff3fefe34a94"],"state_sha256":"fda5ff94bb2b3a8e242f7d4e46eb4dffb17c71f950f4b42757000e71a625777d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"p5t92HxsP3FQ0vIDgH0kt5KgiD6R0zZaNfBXm91zW8mT8xgY+IDjC5TAgIIDDgS34AtSg7bdY5DdV/vm/I8+Bg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T18:43:54.244940Z","bundle_sha256":"c2650e2d6f2213d458a01c4e8324940b42df8a4fbf963d3482ce9c311a3f17a5"}}