GLM Val Tool Overview Monte Bateman. Introduction GLM is an optical instrument Closest analog is LIS Have several ground-based, 24x7 networks; all are.

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Presentation transcript:

GLM Val Tool Overview Monte Bateman

Introduction GLM is an optical instrument Closest analog is LIS Have several ground-based, 24x7 networks; all are RF sensors Comparison between RF & optical characteristics of lightning?

Tool to Validate the GLM System Compare with any other available lightning data Model after RTMM Display multiple data sets Calculate, plot & track all statistics Show trending Flag problems

How to Validate GLM? “Game Changer” Optical sensor; ground-based network are RF == different physics LIS on TRMM (maybe); LIS on ISS (maybe) Range/FOV: WWLLN has the range, but uniformly low DE ~10% DE: NLDN/GLD360 has the range, but mainly sees ground flashes DE: LMA has the DE, but is range-limited

Statistics: FDE Flash detection efficiency Measure against what? WWLLN is global, but only about 10% DE NLDN sees about 80% of ground, 15% of cloud ENTLN? more later... LMA best DE, but range-limited LMA probably the best candidate for FDE

Statistics: FLA Flash location accuracy Same questions GLM pixels are (on average) 9km x 9km LMA has accuracy to a few hundred meters LMA looks at different physics -- won't agree on what a flash is, let alone where it is NLDN (GLD360?) probably the best candidate for FLA

Statistics: FTA Flash time accuracy GLM integrates 2ms frames LMA has timing accuracy to 100 ns, but again, different physics LMA may work, but NLDN probably the best candidate for FTA

Val Tool Map

Comparison Study: WWLLN & ENTLN Needed to fully characterize other networks Compared with LIS, the best analog for GLM Groups to strokes Comparison methodology -- time/space window selection Groups to strokes -- ended up being flash comparisons

WWLLN Timeline Plot

ENTLN Timeline Plot

WWLLN Map

ENTLN Map