Generation mechanisms for TLEs, TGFs, and runaway electron beams

Characterization of TLEs and TGFs region sources
Questions to be addressed	On-board instruments	Studies to be performed
▪ Identify the parameters that may constrain the generation mechanisms for TLEs, TGFs and runaway electron beams taken separately or considered as consequences of the same physical process; ▪ Test generation mechanisms.	▪ Cameras and photometers; ▪ X- and gamma-rays; ▪ Relativistic and energetic electrons; ▪ Wave field measurements from DC to 30 MHz ▪ Zero+ whistler detector ▪ Ion probe.	▪ Identify characteristic parameters for each type of event (optical and spatial structures for sources of TLEs, energy spectra and spatial structures for Gamma ray and X ray bursts, energy and pitch angles distributions for bursts of precipitated and accelerated particles, etc); ▪ Identify the links with environmental conditions; ▪ Investigate and test potential models of generation.