A luminous sphere the size of a grapefruit, ~10–30 cm across, drifts through a room for seconds and vanishes. Reported for centuries, never reliably made to order. This panel is runnable: it holds the plasma cooling time, τ = Ethermal / Pradiated, and proves the honest thing — a hot ionised ball would burn out in milliseconds, not seconds, so simple hot plasma is ruled out with no accepted replacement. This is THE WEIRD: the mystery that is still open.
source Ball lightning (a reported atmospheric phenomenon with no consensus mechanism as of 2026); P. L. Kapitsa, “The nature of ball lightning,” Doklady Akademii Nauk SSSR 101, 245 (1955) — the microwave-resonance hypothesis (Kapitsa, Nobel 1978); J. Abrahamson & J. Dinniss, Nature 403, 519 (2000); J. Cen, P. Yuan & S. Xue, Phys. Rev. Lett. 112, 035001 (2014) — a field spectrum. Room: THE WEIRD. The unsolved case is left honestly open; no mechanism is fabricated.
For centuries, credible witnesses — sailors, pilots, householders — have described a glowing sphere that appears during or after a thunderstorm, floats or rolls at head height, and ends by fading quietly or bursting with a bang. It can pass through a window, slip down a chimney, or hang in mid-air. It is rare, brief, and hard to catch.
Because it will not appear on cue, the archive is eyewitness testimony, not laboratory control. That is why the record is AMBER — real reports, honestly held, but not a repeatable specimen.
Across compiled surveys the portrait is consistent: diameter ~10–30 cm; lifetime ~1–10 s; a visible glow of roughly order kilowatt (a bright lamp); it moves slowly, near neutral buoyancy, and often radiates little felt heat.
These four facts — small, seconds-long, kilowatt-bright, low-buoyancy — are what any theory must explain. They are the inputs to the engine at centre. Compiled observation: AMBER.
In 1955, Pyotr Kapitsa (Nobel 1978, superfluidity) proposed a way past the energy problem: the ball is not living on stored energy at all. An external high-frequency electromagnetic standing wave — a natural microwave resonance in the storm — would continuously pump the plasma, keeping it lit like a bulb on a wire.
It is an elegant escape from the cooling-time trap — but the required standing wave has never been reliably detected in the field. One hypothesis, unconfirmed: AMBER, not LIT.
Suppose the glow is just hot ionised air with no external feed. Set its size, temperature and ionisation. The engine forms the stored thermal energy and the radiated power, then asks: how long can it stay lit?
E = 3 n kB T · (4/3)πR³ (electron+ion thermal store); P = ε σ (4πR²) T⁴ (graybody radiative loss, a conservative floor — volume emission and recombination only make it larger). ε<1 models an optically-thin ball.
Closed form: τcool = n kB R / (ε σ T³). Hotter burns out faster (τ ∝ 1/T³). Every luminous choice lands far below one second:
| T (K) | τcool (s) | vs 1–10 s | mismatch |
|---|
The mismatch (lifetime ÷ cooling time): —. A hot ball radiates its heat away ~10²–10³× faster than it is seen to last. That gap is the open puzzle.
| “simple hot plasma” | bright enough to glow? | lasts the seconds seen? | viable? |
|---|
To be the answer, a plain hot ball must be both luminous (T ≥ ~3000 K) and long-lived (τ ≥ the seconds observed). It can be one or the other, never both: hot enough to shine means cooled in milliseconds. So the honest verdict is OPEN — not solved, not debunked.
What we do have. A 2012 field spectrum (Cen, Yuan & Xue, PRL 2014) caught a natural ball and read Si, Fe, Ca lines — soil elements. Lab plasmoids (microwave cavities, saltwater discharge) mimic pieces of it. Evidence of a real phenomenon — but no complete theory.
Live but unsettled (all AMBER):
Abrahamson–Dinniss (2000): a strike vaporises soil silicon; an oxidising silicon-nanoparticle web glows as it slowly burns — a chemical store, not stored heat.
Kapitsa microwave feed (1955) and other trapped-field / plasma-shell models — an external store.
Hydrodynamic vortex / plasma soliton models — self-confined structure.
“Ball lightning is a myth — a retinal after-image, or mass hysteria.” Dead as the dismissal. A 2012 natural spectrum and repeatable lab plasmoids show a real effect. What is buried is the brush-off, not the reports — yet no idea earns LIT until a full theory does.
The red move: wave the mystery away — “it is only hot ionised air, case closed” — while ignoring the cooling time. The engine calls the bluff: a plasma hot enough to shine drains in ~milliseconds, not the seconds witnessed.
Declare it “solved by hot plasma” and the witness (5) checks whether such a ball could actually last the observed seconds — it cannot, by orders of magnitude — so it turns red. The honest stamp is OPEN, not solved.