Dynamics of sprite streamers in varying air density
نویسندگان
چکیده
منابع مشابه
Positive streamers in air and nitrogen of varying density: experiments on similarity laws
Positive streamers in ambient air at pressures from 0.013 to 1 bar are investigated experimentally. The voltage applied to the anode needle ranges from 5 to 45 kV, the discharge gap from 1 to 16 cm. Using a ”slow” voltage rise time of 100 to 180 ns, the streamers are intentionally kept thin. For each pressure p, we find a minimal diameter dmin. To test whether streamers at different pressures a...
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[1] Modeling results of sprite streamer formation from large ionospheric inhomogeneities or patches (several tens to hundreds of meter wide) indicate that positive streamers can be initiated at subbreakdown conditions from the inhomogeneities with a density comparable to sprite halo densities. For spherical patches with a given radius, the minimum density required for streamer initiation decrea...
متن کاملStreamers in air splitting into three branches
We investigate the branching of positive streamers in air and present the first systematic investigation of splitting into more than two branches. We study discharges in 100mbar artificial air that is exposed to voltage pulses of 10 kV applied to a needle electrode 160mm above a grounded plate. By imaging the discharge with two cameras from three angles, we establish that about every 200th bran...
متن کاملEmergence of sprite streamers from screening-ionization waves in the lower ionosphere
Sprite discharges above thunderclouds at altitudes of 40–90 km (refs 1–5) are usually created by a strong positive cloud-to-ground lightning flash6. Sometimes these sprite discharges emerge from a visible halo5,7–9, and during the first stage they always propagate downwards and branch on their way5,7,9–11. Modelling efforts have been restricted to conditions of non-ionized air of constant densi...
متن کاملReconnection and merging of positive streamers in air
Pictures show that streamer or sprite discharge channels emerging from the same electrode sometimes seem to reconnect or merge though their heads carry electric charge of the same polarity; one might therefore suspect that reconnections are an artefact of the two-dimensional projection in the pictures. Here we use stereo photography to investigate the full three-dimensional structure of such ev...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 2015
ISSN: 0094-8276,1944-8007
DOI: 10.1002/2015gl063269