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            <title xml:lang="en">Modeling of a new electron-streamer acceleration mechanism</title>
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                <forename type="first">K. M. A.</forename>
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                <forename type="first">Sebastien</forename>
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                <title xml:lang="en">Modeling of a new electron-streamer acceleration mechanism</title>
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                    <forename type="first">Sebastien</forename>
                    <surname>Celestin</surname>
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                  <date type="end">2017</date>
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                <term xml:lang="en">Atmospheric electricity</term>
                <term xml:lang="en">NATURAL HAZARDS</term>
                <term xml:lang="en">Atmospheric</term>
                <term xml:lang="en">Lightning</term>
                <term xml:lang="en">ATMOSPHERIC PROCESSES</term>
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              <p>Lightning stepped leaders and laboratory spark discharges in air are known to produce X-rays [e.g., Dwyer et al., Geophys. Res. lett., 32, L20809, 2005; Kochkin et al., J. Phys. D: Appl. Phys., 45, 425202, 2012]. However, the processes behind the production of these X-rays are still not very well understood. During discharges, encounters between streamers of different polarities are very common. For example, during the formation of a new leader step, the negative streamer zone around the tip of a negative leader and the positive streamers initiated from the posiive part of a bidirectional space leader strongly interact. In laboratory experiments, when streamers are approaching a sharp electrode, streamers with the opposite polarity are initiated from the electrode and collide with the former streamers. Recently, the encounter between negative and positive streamers has been proposed as a plausible mechanism for the production of X-rays by spark discharges [Cooray et la., JASTP, 71, 1890, 2009; Kochkin et al., J. Phys. D: Appl. Phys., 45, 425202, 2012], but modeling results have shown later that the increase of the electric field involved in this process, which is above the conventional breakdown threshold field, is accompanied by a strong increase of the electron density. The resulting increase in the conductivity, in turn, causes this electric field to collapse over a few tens of picoseconds, preventing the electrons reaching high energies and producing significant X-ray emissions [e.g., Ihaddadene and Celestin, Geophys. Res. Lett., 45, 5644, 2015]. In this work, we will present simulation results of a new electron acceleration mechanism for producing runaway electron energies above hundred keV. The mechanism couples multiple single streamers and streamer head-on collisions, similar to a laboratory discharge, and is suitable for explaining the high-energy X-rays produced by discharges in air and by lightning stepped leaders.</p>
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