Real time lightning location and detection
The Lightning Imager (LI) provides a real time lightning location and detection (cloud-to-cloud and cloud-to-ground lightning, with no discrimination between the two types).
06, November 2020
The imager is a new instrument, not based on any previous heritage from the Meteosat Second Generation series.
The LI uses detector elements arranged in a detector array covering the whole Earth (no scanning mechanism).
The total energy received from the photons are sensed by each detector element and integrated during the integration period. These are then compared with the LI Trigger Threshold and if the energy exceeds this threshold, it is identified as an LI triggered Event (Figure 2).
The Lightning Imager (LI), on board the MTG-I satellites, will continuously measure at a wave-length of 777.4 nm with a very narrow bandwidth, with a spatial resolution 4.5 km at sub-satellite point, triggered by a variable threshold — optical pulses initiated by lightning emitting energy of larger than between 4 and 7 µJm-2sr-1.
The field of view (FOV) (Figure 3) of the LI instrument is covered by four identical cameras on the instrument, each covering one out of four domains on the observable Earth disc.
Products derived from the instrument data will be arranged around following three categories:
- Events — what the instrument measures, a triggered pixel in the detector grid.
- Groups — neighbouring events in the same integration period (1 ms), representing a lightning stroke.
- Flashes — collection of groups in temporal and spatial vicinity (XX km, YY milliseconds), representing a lightning flash.
The MTG-I LI instrument will complement the NOAA Geostationary Lightning Mapper (GLM) on the GOES-R and the GOES-S satellites and CMA Lightning Mapper onboard the FY-4 satellite series.
IRS will provide information on water vapour and temperature structures of the atmosphere.
Comparison of ground-based LLS network data to ISS-LIS in MTG LI domain
This study compares data from the Lightning Imaging Sensor flown on the International Space Station (ISS-LIS) with various ground based lightning detection systems, in preparation for the Lightning Imager (LI) onboard the Meteosat Third Generation Imaging satellite (MTG-I).
ATDnet network redesign feasibility study
This study examined the Met Office lightning location network (ATDnet) with respect to requirements for the forthcoming Meteosat Third Generation (MTG) Lightning Imager (LI) instrument.