Заседание семинара «Астрофизика космических лучей и физика космоса» им. М.И. Панасюка состоится в среду, 09 декабря 2020 года в 11:00 в режиме видеоконференции по ссылке .
Идентификатор конференции: 819 4454 3031 (вводится без пробелов)
Код доступа: 260242
Abstract
Based on experimental results of recent years, this article presents a qualitative description of a possible mechanism covering the main stages of lightning initiation, starting before and including the initiating event, followed by the initial electric field change (IEC), followed by the first few initial breakdown pulses (IBPs). The Mechanism assumes initiation occurs in a region of ~1 km^3 with average electric field E>0.3 MV/(m∙atm), which contains, because of turbulence, numerous small “Eth-volumes” of ~10^-4-10^-3 m^3 with E≥3 MV/(m∙atm). The Mechanism allows for lightning initiation by either of two observed types of events: a high power VHF event such as a Narrow Bipolar Event, or a weak VHF event. According to theMechanism, both types of initiating events are caused by a group of relativistic runaway electron avalanche particles (where the initial electrons are secondary particles of an extensive air shower) passing through many Eth-volumes, thereby causing the nearly simultaneous launching of many positive streamer flashes. Due to ionization-heating instability, unusual plasma formations (UPFs) appear along the streamers’ trajectories. These UPFs combine into three-dimensional (3D) networks of hot plasma channels during the IEC, resulting in its observed weak current flow. The subsequent development and combination of two (or more) of these 3D networks of hot plasma channels then causes the first IBP. Each subsequent IBP is caused when another 3D network of hot plasma channels combines with the chain of networks caused by earlier IBPs.
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Event dates: Wednesday, 9 December, 2020 - 11:00
Reports:
Ключевая роль широких атмосферных ливней для механизма инициации и развития молнии от инициирующего события (IE) до начальных импульсов пробоя (IBPs) (версия 2)