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It is quite probable that there are several different physical forms of ball lightning, each having its own characteristic set of properties. These phenomena are rare and this rarity leads to the wide variety of descriptions of ball lightning.<br><br>Lightning balls seem to appear near the end of severe electrical storms. This happens after the air has been highly ionized and is filled with electromagnetic disturbances generated by the conventional lightning.<br><br>The diameters of observed lightning balls range from a few inches to rare instances of many feet. The average diameter of a ball is about 10 inches. The balls are usually moved by rolling or sliding along conductors such as telephone wires, fences, and other metallic objects.<br><br>The lifetime of a ball of lightning may range from a few seconds to minutes.<br><br>One large ball was observed to hang near the base of a cloud for 15 minutes. The calculated surface temperature of a lightning ball can be as high as 5,000 degrees Celsius. When the ball decays, a great amount of energy is released.<br><br>The Soviet physicist Pyotr Kapitsa was the first to present a reasonable explanation for the majority of the questions in a hypothesis for ball lightning. His<br><br>ideas on the energy balance, on the importance of resonance phenomena, and on the fixed dimensions of "ball lightning are, well known. The theory put forward by him<br><br>in 1955 starts with the description of a powerful flash of lightning at the end of a thunderstorm. It paves the way for the appearance of ball lightning at sufficient ionization of the air and the presence of vapours necessary for the ionization of the rising current of air. The ionized clouds of plasma are composed of the atomic nuclei of gas<br><br>stripped of their electrons. These nuclei possess their own 'periods of electromagnetic oscillations and are able to absorb the incoming external electromagnetic energy of the same period. This is known as the resonance effect.<br><br>Details of Kapitsa's hypothesis include the reasoning that during the luminescence period, some energy is supplied continuously into the ball lightning and<br><br>The energy source is outside the ball. This reasoning is based on the conservation of energy principle and on the realization that the ball lightning is suspended in the air<br><br>With no visible link with the energy source, the only source of energy is the absorption of intense outside radio waves. The resonance characteristic of the absorption process is determined by the form of the ball lightning alone and by its<br><br>It's not a For effective absorption of radio waves by the lightning ball, the natural frequence of the electromagnetic oscillations within the ball, must coincide with the natural period of the absorbed radiation.<br><br>As to academician Kapitsa, his field of interests was not limited by high temperatures alone. In 1978 he was given a Noble prize for his fundamental discoveries and inventions in the field of low temperatures and superconductivity.
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