Blue jets: Difference between revisions
From Glossary of Meteorology
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{{Term | |||
|Display title=blue jets | |||
{{ | |Definitions={{Definition | ||
|Num=1 | |||
|Meaning=Weakly [[luminous]] upward propagating discharges, blue in color, emanating from the tops of thunderstorms. | |||
|Explanation=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<sup>-1</sup> (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|magnetic field]]. | |||
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Latest revision as of 12:36, 26 March 2024
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.
