Olivier Chanrion, Torsten Neubert

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Presentation transcript:

Olivier Chanrion, Torsten Neubert NSI model for the production of runaway electrons in streamer discharges. Olivier Chanrion, Torsten Neubert National Space Institute / Danish Technical University chanrion@space.dtu.dk

Outline. - Introduction : Streamer discharges Outline - Introduction : Streamer discharges Thermal runaway mechanism Terrestrial Gamma-ray Flashes - The Danish model - Result example - Plans …

Streamer discharge Streamers : Streamer discharge Streamers : - filaments of weakly ionised plasma propagating both along and against the electric field - present in leader tips of lightning, in mesospheric discharge ( sprites ) … Enhancement of the field in the streamer heads Can ‘push’ thermal electrons into the runaway regime => Role in TGF ?

On the production of runaway electrons Electric field = 3 Ek Ionization threshold Friction force X-ray -ray thermal electrons runaway electrons Are streamers responsible for the recently observed Terrestrial -ray Flashes ? Numerical difficulty : Few high energy electrons % low energy ones

The Danish Model Chanrion&Neubert, JGR, 115 (2010) Physical model : Fully kinetic - movement of electrons in a background electric field - collision with neutral ( attachment, excitation, ionization, photoionization ) - total cross section comes from Phelps ( BOLSIG ) - extrapolation to high energies follows Murphy (LANL Rep. 2002) - scattering angle follows Okhrimovsky (PhysRevE,65,2002) - Ionisation energy partitionning follows Opal (J. Chem. Phys., 55, 1971) Numerical model 3D like geometry (2D cylindrical) - Based on the standard Birdshall Particle in Cell + Monte Carlo Collision - Advanced resampling technique for high energy electron Features - Allow to study the acceleration of cold electron in the runaway regime - Unprecedented precision allows to calculate the probability to runaway

distribution function with the The Danish Model distribution function with the runaway branch Threshold for runaway Probability to runaway

The Danish Model In a background field of 3Ek Estimate of runaway in agreement with Moss(JGR,111,2006) and Gurevich (Phys.Lett.A, 361, 2007) work => lead to agreement with TGF observations.

Plans Nb of electrons 1/Probability to runaway First runaway appears when the field in the tip is about 5 Ek At t > 1.8 µs, 1012 electrons drift in a field > 5Ek => Above the precision limit a standard MCC code

Plans Main goal : Simulate the production of X- and Gamma ray Understand the impact on the streamer propagation Deniz Cinar, a PhD student will start next month Preliminary studies with 1D code Implementation of advance in the quasi-3D code Collaboration with CWI/TU Eindhoven (Ute Ebert, L. van Deursen) RFNC ( Babich )