Difference between revisions of "Blue jets"

From Glossary of Meteorology
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<div class="definition"><div class="short_definition">Weakly [[luminous]] upward propagating discharges, blue in color, emanating from the tops  of thunderstorms.</div><br/> <div class="paragraph">Following their emergence from the top of the [[thundercloud]], they typically propagate upward  in narrow cones of about 15&#x000b0; full width at vertical speeds of roughly 100 km s<sup>-1</sup> (Mach 300),  [[fanning]] out and disappearing at heights of about 40&ndash;50 km. Their intensities are on the order  of 800 kR near the base, decreasing to about 10 kR near the upper terminus. These correspond  to an estimated optical [[energy]] of about 4 kJ, a total energy of about 30 MJ, and an energy density  on the order of a few millijoules per cubic meter. Blue jets are not aligned with the local [[magnetic  field]].</div><br/> </div>
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<div class="definition"><div class="short_definition">Weakly [[luminous]] upward propagating discharges, blue in color, emanating from the tops  of thunderstorms.</div><br/> <div class="paragraph">Following their emergence from the top of the [[thundercloud]], they typically propagate upward  in narrow cones of about 15&#x000b0; full width at vertical speeds of roughly 100 km s<sup>-1</sup> (Mach 300),  [[fanning]] out and disappearing at heights of about 40&ndash;50 km. Their intensities are on the order  of 800 kR near the base, decreasing to about 10 kR near the upper terminus. These correspond  to an estimated optical [[energy]] of about 4 kJ, a total energy of about 30 MJ, and an energy density  on the order of a few millijoules per cubic meter. Blue jets are not aligned with the local [[magnetic field|magnetic  field]].</div><br/> </div>
 
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Latest revision as of 15:30, 25 April 2012



blue jets

Weakly luminous upward propagating discharges, blue in color, emanating from the tops of thunderstorms.

Following their emergence from the top of the thundercloud, they typically propagate upward in narrow cones of about 15° full width at vertical speeds of roughly 100 km s-1 (Mach 300), fanning out and disappearing at heights of about 40–50 km. Their intensities are on the order of 800 kR near the base, decreasing to about 10 kR near the upper terminus. These correspond to an estimated optical energy of about 4 kJ, a total energy of about 30 MJ, and an energy density on the order of a few millijoules per cubic meter. Blue jets are not aligned with the local magnetic field.