Ball lightning (BL) has been observed with two slitless spectrographs at a distance of 0.9 km. A surface discharge shorts these batteries, causing a current that forms the ball. The study also showed that the rapidly changing magnetic field of a close lightning flash is strong enough to excite the neurons in the brain. At the tip of a lightning stroke reaching the ground, a relativistic electron bunch can be produced when in contact with microwave radiation. [60][63][64] Videos and spectrographs of this experiment have been made available. Static discharge from the cylindrical stage imply the existence of contact electrification within the object. In an open space, the vortex fades and finally disappears. In this building is situated the dynamos and electrical apparatus of perhaps the finest electrical plant of its size in the state. A ball lightning effect that occurred during an electrical storm would be termed 'ball lightning'. One popular theory is that ball lightning is caused when lightning striking the ground vaporizes some of the silicate minerals in soil. It was found that the most intense plasma oscillations occur in the central regions of a ball lightning. Vol. Experiments by Eli Jerby and Vladimir Dikhtyar in Israel revealed that microwave plasma balls are made up of nanoparticles with an average radius of 25 nm (9.8×10−7 inches). From the spectrum, the temperature of the ball lightning was assessed as being lower than the temperature of the parent lightning (<15,000 to 30,000 K). As the vortex has a much smaller vector of energy compared to the overall energy of the reactant sonic shock wave, its vector is likely fractional to the overall reaction. The simplest case corresponds to radial oscillations in a spherical plasma membrane. He said that the balls sometimes split into smaller balls and may explode "like a cannon".[17]. He was sheltered in a small cottage when he, in his own words, ...noticed, with what I can only describe as calm amazement, that a dazzling globe of electric fire, apparently between six and twelve inches [15 and 30 cm] in diameter, was stationary about six inches [15 cm] below and to the right of my right knee. The data suggest that the glowing ball was composed of elements from soil, consistent with one popular theory. Just before the explosion, the ball seemed to be the size of a large mill-stone. Matthew Francis has dubbed this the "dirt clod hypothesis", in which the spectrum of ball lightning shows that it shares chemistry with soil. A ball of lightning came into the barn through an opening and travelled along the top of a horizontal metal bar that held a litter cart, about 10 feet in the air. The ball of fire allegedly smashed the pews and many windows, and filled the church with a foul sulphurous odour and dark, thick smoke. [91] Such fields, which are found within close distances to a point in which multiple lightning strikes have occurred over a few seconds, can directly cause the neurons in the visual cortex to fire, resulting in magnetophosphenes (magnetically induced visual hallucinations). Pages in category "Ball lightning" This category contains only the following page. The lightning balls can dramatically explode as the structure destabilizes. The balls have been reported to disperse in many different ways, such as suddenly vanishing, gradually dissipating, being absorbed into an object, "popping," exploding loudly, or even exploding with force, which is sometimes reported as damaging. These then recombine to form nanoparticles or filaments which, while still floating in air, react with oxygen, releasing heat and emitting the glow [3]. [94], Chen was able to derive the physics and found that there is a class of plasma toroids that remain stable with or without an external magnetic containment, a new plasma configuration unlike anything reported elsewhere. [23], A beautiful yet strange phenomenon was seen in this city on last Monday night. The present theory concerns only the low energy lightning ball form, with centripetal forces and surface tension. The observed data are consistent with vaporization of soil as well as … Expl., Vol. The spectrum of a cloud-to-ground lightning strike and of the ball lightning it generated. [91][92] Even when thunderstorms were not ascribed directly to the activity of a divine being, they were considered a disturbing premonition. Cooray and Cooray (2008)[90] stated that the features of hallucinations experienced by patients having epileptic seizures in the occipital lobe are similar to the observed features of ball lightning. This condensed excited state of matter is supported by experiments, mainly of a group led by Holmlid. It moves horizontally during the luminous duration. The BL is generated by a cloud-to-ground lightning strike. [54][55], Many modern experiments involve using a microwave oven to produce small rising glowing balls, often referred to as plasma balls. If the vortex's expansion is obstructed, and symmetry is broken, the vortex breaks into cyclical form. M. Colon, Vice-President of the Geological Society of Paris, saw a ball of lightning descend slowly from the sky along the bark of a poplar tree; as soon as it touched the earth it bounced up again, and disappeared without exploding. In front of, above and around the new Hall of Engineering of the School of Mines, balls of fire played tag for half an hour, to the wonder and amazement of all who saw the display. According to statistical investigations in 1960, ball lightning appear in a ball lightning is an unexplained phenomenon as! 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