Abstract
AbstractX-ray and γ-ray emissions observed in lightning and long sparks are usually connected with the bremsstrahlung of high-energy runaway electrons. Here, an alternative physical mechanism for producing X-ray and gamma-ray emissions caused by the polarization current and associated electromagnetic field moving with relativistic velocity along a curved discharge channel has been proposed. The existence of fast electromagnetic surface waves propagating along the lightning discharge channel at a speed close to the speed of light in vacuum is shown. The possibility of the production of microwave, X-ray and gamma-ray emissions by a polarization current pulse moving along a curved path via synchrotron radiation mechanism is pointed out. The existence of long tails in the power spectrum is shown, which explains observations of photon energies in the range of 10–100 MeV in the terrestrial gamma-ray flashes, as well as measured power spectrum of laboratory spark discharge.
Funder
Russian Foundation for Basic Research
Ministry of Science and Higher Education of the Russian Federation
Publisher
Springer Science and Business Media LLC
Reference47 articles.
1. Wilson, C. T. R. The acceleration of β-particles in strong electric fields such as those of thunderclouds. Proc. Cambridge Phil. Soc. 22, 534–538 (1925).
2. Enoto, T. et al. Photonuclear reactions triggered by lightning discharge. Nature 551, 481–484 (2017).
3. Fishman, G. J. et al. Discovery of intense gamma-ray flashes of atmospheric origin. Science 264, 1313–1316 (1994).
4. Dwyer, J. R. et al. Observation of a gamma-ray flash at ground level in association with a cloud-to-ground lightning return stroke. J. Geophys. Res. 117, A10303 (2012).
5. Wada, Y., et al. Downward Terrestrial Gamma-Ray Flash Observed in a Winter Thunderstorm. Phys. Rev. Lett. 123, 061103 (2019).
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