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Dynamics of sprite streamers in varying air density
Author(s) -
Qin Jianqi,
Pasko Victor P.
Publication year - 2015
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2015gl063269
Subject(s) - sprite (computer graphics) , electric field , electron density , physics , computational physics , density of air , statistical physics , mechanics , electron , meteorology , computer science , quantum mechanics , computer vision
Similarity laws for streamer discharges, which state that the properties of streamers such as streamer radius, electric field, and electron density should respectively scale as N −1 , N 1 , and N 2 in different but uniform air densities N , are important relations that have provided a general understanding of the mesospheric sprite discharges based on existing knowledge of streamers in laboratory conditions. Recent modeling studies, however, show that the properties of sprite streamers in varying air density do not follow exactly or even contradict the similarity relations. We present here simulation results and related analysis of sprite streamers to provide a unified view and resolve these contradictions. Our results indicate that the properties of streamers in varying air density are determined by the physical dimensions of streamers and the reduced electric field E / N , with the varying air density N being only one of the three factors controlling the streamer properties.