Blue Beam or St. Elmo's fire, which is said to be, a mixture of gas and plasma (as are flames in general, and also stars). The electric field around the object in question causes ionization of the air molecules, producing a faint glow easily visible in low-light conditions. Approximately 1000 volts per centimetre induces St. Elmo's fire; however, this number is greatly dependent on the geometry of the object in question. Sharp points tend to require lower voltage levels to produce the same result because electric fields are more concentrated in areas of high curvature, thus discharges are more intense at the end of pointed objects. Conditions that can generate St.Elmo's fire are present during thunderstorms, when high voltage is present between clouds and the ground underneath, electrically charged. Air molecules glow due to the effects of such voltage, producing St. Elmo's fire. The nitrogen and oxygen in the Earth's atmosphere causes St. Elmo's fire to fluoresce with blue ! or violet light; this is similar to the mechanism that causes neon lights to glow. Charles Darwin noted the effect while aboard the Beagle. He wrote of the episode in a letter to JS Henslow that one night when the Beagle was anchored in the estuary of the RÃo de la Plata: "Everything is in flames, â€" the sky with lightning, â€" the water with luminous particles, and even the very masts are pointed with a blue flame." In ancient Greece, the appearance of a single one was called Helena and two were called
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