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- W4220666002 abstract "<p>TGFs are short-duration bursts of high-energy photons shot from Earth&#8217;s atmosphere to space. They are produced during the initial upward propagation of +IC lightning leaders and are often associated with LF radio sferics. The Atmosphere-Space Interactions Monitor (ASIM) instrument provides X- and gamma-ray measurements synchronous with optical recordings in 180-240 nm, 337 nm and 777.4 nm wavelengths, allowing simultaneous detection of TGFs and the lightning processes associated with them.</p><p>ASIM observations show that TGFs are accompanied by a prominent optical pulse that marks the beginning of a lightning flash. TGFs tend to precede the pulse slightly, but the short duration of TGFs, together with the delay of the optical pulses from photon scattering in cloud particles, does not allow to resolve the correct sequence of events with confidence.</p><p>The same problem is present in measurements of radio waves, where the waves emitted by the TGF currents usually are mixed with those of the lightning currents because of the temporal proximity of the processes.</p><p>Here we report a remarkable TGF, with a high fluence of 360 counts in the energy range 0.4 - 20 MeV and a relatively long duration of 580 &#181;s. The associated optical pulse is clearly following the TGF, which leads us to conclude that the current surge inside the leader channel is not generating the TGF, as has been proposed by models, but instead that the TGF process conditions the current surge that follows.</p>" @default.
- W4220666002 created "2022-04-03" @default.
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- W4220666002 date "2022-03-27" @default.
- W4220666002 modified "2023-10-14" @default.
- W4220666002 title "Discerning TGF and leader current pulse in ASIM observation" @default.
- W4220666002 doi "https://doi.org/10.5194/egusphere-egu22-4240" @default.
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