The Lightning Mapping Array 12 years of evolution and growth
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The Lightning Mapping Array12 years of evolution and growth
Ronald Thomas, Paul Krehbiel, Bill RisonNew Mexico Tech
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Lightning Mapping arrays7 now 3 more in the next 2 years
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An example of Storm Detection
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Additional and Expanded Networks
Texas Tech
OK SW
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NA real time
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Georgia Tech
2 minute updates to NWS
Additional and Expanded Networks
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Height vs Time
Plan View
Height vs E-W
Height vs N-S
Example of Highly Dendritic Negative CG flash
STEPS 2000, Kansas, Colorado
An example of imaging of a single lightning flash
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Comparison with radar
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LMA source power
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charge density NGS
from
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charge density NGS
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Langmuir Labatory LMA with16 stations
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Langmuir Labatory LMA with16 stations
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Langmuir Laboratory with Analog TV interference
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Eruption of Redoubt Volcano
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EyjafjallajökullEyjafjallajökull
Eyjafjallajökull Eruption, Iceland 2010
Reykjavik
LMA stationsEyjafjallajökull
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EyjafjallajökullEyjafjallajökull
Eyjafjallajökull Eruption, Iceland 2010
Reykjavik
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EyjafjallajökullEyjafjallajökull
Eyjafjallajökull Eruption, Iceland 2010
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EyjafjallajökullEyjafjallajökull
Eyjafjallajökull Eruption, Iceland 2010
Animation of one flash lasting about 300 ms
Charge identifiedRed - positive
Blue - negativeGreen - undetermined
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Solar LMA - Langmuir Lab 2010
Solar power moves system away from infrastructure to quieter RF
environments, reduces noise and improves sensitivity
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Sealed electronics enclosure for weather proofing and RF isolation
-95 dBm internally generated noise
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LMA on a Chip
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LiveLMA Updates each 1 second
2 second delayTime-height as a ‘strip-chart’
zoom and pan
LiveLMA
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LiveLMA
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LiveLMA
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LiveLMA
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LiveLMA
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LiveLMA
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LiveLMA
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LiveLMA
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LiveLMA
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LiveLMA
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LiveLMA
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Questions?
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Next Generation LMA on a chip
2011•low power 1-2 watts, simple,
compact, very robust.
•LMA on a FPGA chip, no computer.
•store data on a compact flash.
•no communication in basic station.
•GPS, log amp, filters, pre amp as in other stations.
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LMA station development•1996-98 designed initial system under NSF
MRI grant.
•1998 LMA-G1 initial operation in OK and NM using a desk-top computer with custom designed LMA board.
•2000 LMA-G2 design used a small single board computer. Used for the North Alabama system.
•2005 LMA-G4 developed the portable LMA under NSF SGER. First use: Augustine Volcano, 2006.
•2008 compact lower power solar powered design with solid-state hard drive.
•2011 LMA-G5 on a chip, small and low power.
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STEPS 2000
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Dugway 2010
NEMA enclosureSolid state hard
drive
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Analysis improvements
•data analysis revised in 2007
•Real time processing and display
•Updates each 2 minutes at OK/NA/DC
•WSMR faster
•Langmuir - Live-LMA 2 second delay.
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Outline• Networks
• Existing networks
• Langmuir Laboratory
• NASA Huntsville
• OK LMA
• WSMR
• DC LMA
• *Planned*/in process networks
• Dugway
• DC3/CO Front Range
• Texas Tech
• Catalonia
• Station Design
• Original station
• Current station types:
• WSMR/Dugway
• Portable stations
• Solar stations
• Next generation
• Network Capabilities:
• *Sensitivity* (improvements due to DTV conversion, solar operation)
• Processing (lma_analysis)
• Real time processing display
• OK/NA/DC (2 min updates)
• WSMR (faster updates)
• Live LMA
• Analysis techniques
• Source power
• Flash algorithm
• Charge ID
• Storm charge structure
• etc.
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The lightning Mapping Array
•Capabilities
•Image total lightning and individual flashes
•Detect 100% of the flashes - 100 km radius or more
•LMA Arrays and stations - an ongoing evolution
•Analysis and real time data
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Storm detectionnote limitations due to curvature of earth