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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 1,225 records · Page 68

Laboratory ball lightning.

Ball lightning formation attributed to low hydrocarbon density coupled with atmospheric electrical discharge

Barry, J. D.↗

Satellite observations of lightning

Nighttime lightning activity observations by orbiting solar satellite OSO-B, determining thunderstorms positions by optical radiation detection

Ney, E. P.↗

High voltage lightning grounding device

Grounding device insertion in wire termination cabinets and terminal block modification prevent lightning-induced high voltage transients from reaching inputs or outputs of solid state instruments and control systems. Installation minimizes wiring confusion and achieves 100 percent protection.

Hoffman, R. G.↗

Lightning flash detection system

Array of photodetectors and associated circuitry continuously monitors entire horizon to measure distance and direction of lightning flashes.

Borucki, W. J.↗

Ignition of Fuel Vapors Beneath Titanium Aircraft Skins Exposed to Lightning

Hot-spot and puncture ignition of fuel vapors by simulated lightning discharges was studied experimentally. The influences of skin coating, skin structure, discharge polarity, skin thickness, discharge current level, and current duration were measured and interpreted. Ignition thresholds are reported for titanium alloy constructed as sheets, sheets coated with sealants, and sandwich skins. Results indicated that the ignition threshold charge transfer for coated sheets, honeycomb, and truss skins is respectively about 200%, 400%, 800% that of bare alloy sheet of .102 cm (.040 in.)-thickness. It was found that hot-spot ignition can occur well after termination of the arc, and that sandwich materials allow ignition only if punctured.

Kosvic, T. C.↗