Excitation and observation of ball-lightning type spherical formations

Bulgakov, A. A.; Yefimov, B. P.; Khutoryan, Eduard; Khorunzhiy, M.O.; Кулешов, А. Н.

doi:10.1109/mmet.2008.4580921

Cited by 1 publication

(2 citation statements)

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“…31 Kuleshov and coworkers in Ukraine studied a similar setup and proposed that a critical step in the plasmoid formation is the generation of an acoustically driven plasma column in the aqueous solution, produced by the discharge's shock wave. 32,33 This group also observed that the lifetime of the plasmoid is very sensitive to the temperature of the electrolyte, preferring lower temperatures. 34 Similar experiments were reproduced with additional diagnostics by a group in Germany, including time-resolved high-resolution emission spectroscopy (300−800 nm), laser deflection measurements, and misc probes of the plasma (Langmuir, thermocouple, etc.).…”

Section: ■ Introductionmentioning

confidence: 95%

“…Several years after the initial discovery, Tanabe and collaborators in Japan published a series of papers reporting the time dependence of the visible emission spectrum, dependence of the emission lifetime on some of the electrical properties of the discharge, and identification of the three sequential processes involved in the formation of the plasmoid . Kuleshov and coworkers in Ukraine studied a similar setup and proposed that a critical step in the plasmoid formation is the generation of an acoustically driven plasma column in the aqueous solution, produced by the discharge’s shock wave. , This group also observed that the lifetime of the plasmoid is very sensitive to the temperature of the electrolyte, preferring lower temperatures . Similar experiments were reproduced with additional diagnostics by a group in Germany, including time-resolved high-resolution emission spectroscopy (300–800 nm), laser deflection measurements, and misc probes of the plasma (Langmuir, thermocouple, etc.…”

Section: Introductionmentioning

confidence: 99%

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Further Insight into the Nature of Ball-Lightning-Like Atmospheric Pressure Plasmoids

et al. 2013

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Known since antiquity, ball lightning is a natural, long-lived plasma-like phenomenon associated with thunderstorms and is not well understood due to its rarity and unpredictability. A recently discovered laboratory phenomenon with striking similarity to ball lightning is observed when a high-power spark is discharged from a cathode protruding from a grounded electrolyte solution. Whereas several investigations of these long-lived plasmas have been reported over the past decade, the underlying chemical and physical processes are still unknown. The present work attempts to gain further insight into this phenomenon by examining the effect of electrolyte pH on the plasmoid and observing the chemical and physical structure of the plasmoid using high-speed schlieren videography and FTIR absorption spectroscopy. The results indicate that the lifetime and size of the plasmoid slightly increase as the pH of isoohmic electrolyte solutions deviate from neutrality. The observed absorption spectra of the plasmoids exhibit absorption cross sections in the 620-700, 1500-1560, 2280-2390, and 3650-4000 cm(-1) ranges, the last attributed to the presence of water clusters. Finally, schlieren images revealed a single, sharp density gradient at the boundary layer of the top and sides of the expanding ball-shaped plasmoid, and turbulent mixing below the ball.

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