{"id":653,"slug":"phanerozoic--hi-21cm-survey","name":"hi-21cm-survey","author":"phanerozoic","description":"\n\t\n\t\t\n\t\n\t\n\t\t21cm Hydrogen Line Sky Survey\n\t\n\nContinuous 1-second-cadence power spectra of the 21cm neutral hydrogen (HI) line at 1420.405 MHz, recorded 24/7 from a fixed omnidirectional observer on the US East Coast.\n\n\t\n\t\t\n\t\n\t\n\t\tWhat this is\n\t\n\nA radio telescope pointed at the whole sky, recording one spectrum per second, indefinitely. The Earth's rotation scans the beam across the galactic plane daily, producing a natural drift scan. Every row is a self-timestamped power spectrum spanning 2… See the full description on the dataset page: https://huggingface.co/datasets/phanerozoic/hi-21cm-survey.","tags":"[\"Task_categories:time-Series-Forecasting\",\"Size_categories:1M<n<10M\",\"Format:parquet\",\"Modality:tabular\",\"Modality:text\",\"Library:datasets\"]","license":null,"framework":null,"parameters":null,"downloads":121127,"likes":3,"verified":0,"created_at":"2026-06-24 20:23:28","updated_at":"2026-06-29 06:23:34","source_url":"https://huggingface.co/datasets/phanerozoic/hi-21cm-survey","source_platform":"huggingface","hf_repo_id":"phanerozoic/hi-21cm-survey","ollama_name":"","category":"dataset","latest_version":"v1.0.0","version_count":1,"signature_count":1,"risk_level":null,"risk_score":null,"versions":[{"id":652,"model_id":653,"version":"v1.0.0","manifest_hash":"5965245d8dd512d7ed7538c023b20503f019a0a77887ded5523a90ef55526dd3","file_count":0,"total_size":0,"r2_manifest_key":"manifests/datasets/phanerozoic--hi-21cm-survey/v1.0.0.json","created_at":"2026-06-24 20:23:28"}],"files":[],"signatures":[{"id":1207,"version_id":652,"signer_did":"did:quantamrkt:registry:shield-v1","algorithm":"ML-DSA-65","signature_hex":"a2b46a25482177acd407da28fb0543b4d922fdb2a12dcad5bb196d47f75580d1","attestation_type":"registry","signed_at":"2026-06-24 20:23:28"}],"hndl":null}