{"id": "card_tool_schumann_resonance", "kind": "reference", "title": "The Schumann resonance — the planet's cavity tone, sealed", "body": "The Earth-ionosphere cavity rings at an idealized fundamental f1 = (c/(2*pi*a))*sqrt(2) ~ 10.59 Hz (sealed on the schumann stick - run tick.py schumann); the OBSERVED ~7.83 Hz is lower by ~0.74, the finite-conductivity correction of the real, lossy ionosphere. A resonance of the whole planet - a standing wave on a closed cavity, the same shape (modes on a bounded domain, counted by the roots of unity, a receiver tuned to a band) the engine is built on. The fit, with its delimitation stated: the exact model sealed, the world's departure from it named.", "source": {"label": "Narrow Highway — the instruments", "url": "", "authority_tier": "engine_derived", "ref": "card_floor_the_instruments"}, "shelf": "codex", "box": "instruments", "bands": ["schumann resonance", "schumann", "earth-ionosphere cavity", "7.83 hz", "resonance", "standing wave", "electromagnetism", "instrument", "one map"], "subject": "The Schumann resonance — the planet's cavity tone, sealed", "connections": [{"to_card_id": "card_floor_the_instruments", "relationship": "part_of", "evidence": "a sealed resonance fit - the planet's cavity tone"}, {"to_card_id": "card_tool_resonators", "relationship": "connects_at", "evidence": "the Earth-ionosphere cavity is the planet-sized cavity resonator; same count of modes, same fit"}], "author": "engine", "created_at": 0.0, "updated_at": 0.0, "visibility": "public", "lifecycle_stage": "public", "volatility": "permanent", "surface": "secular", "generated": false, "call": "codex.instruments", "facets": {"subject": ["7.83 hz", "earth-ionosphere cavity", "electromagnetism", "instrument", "one map", "resonance", "schumann", "schumann resonance", "standing wave"]}, "presentation": {"glyph": "•", "kind_label": "instruments", "by": "Narrow Highway — the instruments", "authority": "engine_derived", "posted": "", "standing": ""}, "neighbors": [{"id": "card_floor_the_instruments", "title": "The instruments — every verifier and validator, and where they join", "relationship": "part of", "why": "a sealed resonance fit - the planet's cavity tone", "href": "/card/card_floor_the_instruments", "resolved": true}, {"id": "card_tool_resonators", "title": "Resonators — Helmholtz, the cavity, Fabry-Perot: one shape, a Q that fades", "relationship": "connects at", "why": "the Earth-ionosphere cavity is the planet-sized cavity resonator; same count of modes, same fit", "href": "/card/card_tool_resonators", "resolved": true}], "house": {"door": "FIND", "kind": "card", "trail": "connections", "seal": "/card/card_tool_schumann_resonance", "next_step": {"do": "follow a connection: what this card rests on, and what rests on it", "door": "FIND", "tool": "card_connections", "params": {"id": "card_tool_schumann_resonance"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}