Propagation speed of runaway electron avalanches

Details Propagation speed of runaway electron avalanches Propagation speed of runaway electron avalanches

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3311810c&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 11, CiteID L11810

Physics

19

Atmospheric Processes: Theoretical Modeling, Atmospheric Processes: Radiative Processes, Atmospheric Processes: Remote Sensing, Atmospheric Processes: Lightning, Atmospheric Processes: Atmospheric Electricity

Scientific paper

Simulations of relativistic runaway breakdown (RRB) are performed as functions of both time and space, resulting in explicit calculations of e-folding lengths (λ) and times (τ). The ratio of λ to τ agrees well with the speed of the avalanche, which ranges from 2.61 × 108 m s-1 to 2.72 × 108 m s-1. Thus, using the speed of light, c, for the ratio of λ to τ can cause a 10% error when estimating λ from τ. A 10% error in λ will cause a factor of three error in the predicted number of runaway electrons for every ten estimated e-foldings. In addition, previous models that predict peak radiated electric fields from RRB have used avalanche speeds of 0.987c and higher. Using a propagation speed of 0.89c causes a dramatic change in the predicted beaming pattern of electromagnetic radiation caused by RRB in these models.

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