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EUMETSAT: Update on MTG-LI and Cal/Val Status. Lightning Imager (LI) Marcel Dobber , Jochen Grandell , Rolf Stuhlmann Meteosat Third Generation (MTG)-I1 (2019), I2, I3 and I4. The MTG-LI mission.

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eumetsat update on mtg li and cal val status
EUMETSAT: Update on MTG-LI and Cal/Val Status

Lightning Imager (LI)

Marcel Dobber, JochenGrandell, Rolf Stuhlmann

Meteosat Third Generation (MTG)-I1 (2019), I2, I3 and I4

the mtg li mission
The MTG-LI mission
  • Earth coverage about equal to visible disc from geostationary orbit (instantaneous view) at 0 degrees longitude.
  • Continuous measurements of triggered events: lightning triggered events and false events (noise, microvibrations, cosmic particles, etc.).
  • Continuous measurements of background images, typically one every minute.
  • Continuous measurements during day and night.
  • Lightning detection at 777.6 nm (vacuum wavelength): strong lightning atomic oxygen emission line.
  • Biggest challenge for this mission / instrument:

Maintain a proper balance between lightning detection efficiency and false alarm rate (= measured triggered events that are not related to lightning).

global lightning subsatellite longitude 0 degrees
Global lightning, subsatellite longitude 0 degrees

Overlap with

GOES-R Geostationary Lightning Mapper (GLM)

Annual flash rate (in flashes / km² / year) over the Earth (MTG view), as derived from LIS/OTD (low-earth orbit) observations at 0.5° resolution

the li instrument
The LI instrument
  • Measurement principle to discriminate between lightning signal and background signal (e.g. bright cloud):
    • Spatial: ground pixels 4.5 km x 4.5 km at nadir (lightning typically >10 km diameter).
    • Spectral : at 777.6 nm (vacuum wavelength) with 1.5-2.0 nm spectral band pass filter.
    • Temporal : 1 ms integration time. Lightning optical pulse (from space) has a typical duration of 0.6 ms.
    • Background subtraction: before thresholding and lightning detection.
  • Extensive data processing takes place on board to make the data rate fit within the allowed band width to the ground.
  • 4 (identical) optical cameras, each equipped with a CMOS detector having 1170 x 1000 pixels.
  • Data rate < 30 Mbits/s; Mass < 110 kg; Power < 320 W.
preliminary cal val plans for mtg li
Preliminary Cal/Val plans for MTG-LI
  • Ground-based networks in Europe envisaged for Cal/Val activities:
      • ATDnet
      • LINET
      • LMA (Corsica)
      • GLD360 + EUCLID
  • Rigorous intercomparison of the various networks, relative sensitivity characterisation, as well as development paths (network expansions) to be an important task in the coming years (MTG-I1 launch in early 2019) when preparing a solid Cal/Val plan.
  • Overlap (?) between GLM and LI in 2019 providing a possibility for cross-correlation between the instruments thus mutually supporting both Cal/Val activities.
  • ISS-LIS is expected to provide very interesting and useful data as well, especially for northern latitudes which currently have no LIS coverage.
  • Campaigns:
      • Nothing concrete planned yet, but campaigns will be envisaged in the European context as well as in the “hot spot” of Lake Victoria in Africa
eumetsat cooperation with noaa on glm
EUMETSAT cooperation with NOAA on GLM
  • GLM participation in the MTG LI Mission Advisory group (former LI Science Team) and review of related studies on L0 => L1 => L2 processing by industry (through Doug Mach).
  • Exchange of documents:
    • GLM ATBD, Cal/Val plans (when in public domain)
    • MTG LI MAG related study material (filtering analysis, L2 algorithm analysis, LI simulators, etc)
  • Cal/Val workshop planned for spring 2015 in Florence, Italy, involving the LI MAG and leading GLM experts.
  • EUMETSAT active participation in GLM Cal/Val sought – this could also involve e.g. contribution to measurement campaigns and data analysis.