Tiger Elve Near Tropical Storm Iota
Taken by Frankie Lucena on November 14, 2020 @
Cabo Rojo,Puerto Rico
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Details:
A Tiger Elve is an Elve that contains gravity waves, which look like stripes, and hence the name Tiger. The Vaisala sensors picked up two peak currents for this event but according to Steven Cummer of Duke University, there was actually just one stroke of -381 Ka that produced this Elve. The second peak current of -488 KA was due to the sensor picking up the Ionospheric Reflection about 200 microseconds after the first peak of -381 KA. This Ionospheric Reflection will usually occur with very high peak currents of around 400 KA, so my event at -381 KA was in the ballpark. Most Elves are triggered by a positive cloud to ground stroke but this one was triggered by a negative polarity stroke. I've been using the Vaisala programs Thunderstorm Manager and Lightning Exporter for a little over a month now and I have noticed that most of the Sprites and Elves I've captured here in the Caribbean are of negative polarity. While negative polarity events are not common in other places, like the US and Europe, it is very common here in the Caribbean.The gravity waves seen in this Elve was most likely due to the strong convection of the thunderstorms below.
Video: https://youtu.be/LVaRXzkPGBY
Photographer's website:
https://youtu.be/LVaRXzkPGBY
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