Naslov
On the Initiation of Upward Negative Lightning by Nearby Lightning Activity: An Analytical Approach

Autori
Sunjerga, Antonio ; Rubinstein, Marcos ; Rachidi, Farhad ; Cooray, Vernon

Izvornik
Journal of geophysical research. Atmospheres (2169-897X) 126 (2021), 5; 1-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Initiation Upward Negative Lightning Nearby Activity Analytical Approach triggered

Sažetak
Upward lightning occurs generally from tall structures. The mechanism of the initiationof upward lightning is not yet fully understood. Upward lightning can be classified into two categoriesbased on either the absence or the presence of other lightning activity prior to the upward flash. This workproposes an explanation of how upward lightning flashes can be triggered by nearby lightning activity.It is generally thought that the lightning activity prior to the flash will intensify the electric field at thetip of the tall structures. However, to the best of our knowledge, no attempt has been made to evaluatetheoretically this hypothesis. In this paper, we derive analytically the electric field enhancement on theground (or at the top of tall structures) based on different triggering scenarios. These fields are later usedin a simplified corona model to evaluate if they are able to trigger upward lightning. It is shown that bothslow processes such as leader propagation and faster return strokes can trigger an upward negative flashfrom relatively short structures of a few tens of meters, even without any slowly varying backgroundelectric field. This study confirms theoretically experimental observations and it provides new insightsinto the mechanisms of initiation of upward flashes from tall structures

Izvorni jezik
Engleski

POVEZANOST RADA