![]() A space-born technology for lightning detection is the Lightning Image Sensor (LIS) on board of the Tropical Rainfall Measuring Mission (TRMM) satellite launched in Nov/1997 by NASA. By the other hand, a VLF network called WorldWide Lightning Location Network (WWLLN) was developed in the beginning of 2000's and have been collecting cloud-to-ground lightning data over the entire globe based on more than 30 sensors since 2005. In Brazil, a LF lightning detection network (BrasilDAT) with more than 20 sensors have been collecting cloud-to-ground lightning data since 1999 for the mid-southern Brazil. In the last decade, two new advanced techniques have been used to provide cloud-to-ground lightning data over large areas: the lightning detection networks (on ground) and the space-born lightning instruments (on satellites). ![]() It is known that the thunderdays data were achieved in a small number of observations sites during the first half of the 20th century. ![]() ![]() For decades, thunderstorm maps based on keraunic levels (number of thunderdays per year) have been used to estimate cloud-to-ground lightning density in the Brazilian standard ABNT NBR-5419. ![]()
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