Energetic charged particles above thunderclouds

Fuellekrug, Martin and Diver, Declan and Pincon, Jean-Louis and Phelps, Alan D. R. and Bourdon, Anne and Helling, Christiane and Blanc, Elisabeth and Honary, Farideh and Harrison, R. Giles and Sauvaud, Jean-Andre and Renard, Jean-Baptiste and Lester, Mark and Rycroft, Michael and Kosch, Mike and Horne, Richard B. and Soula, Serge and Gaffet, Stephane (2013) Energetic charged particles above thunderclouds. Surveys in Geophysics, 34 (1). pp. 1-41. ISSN 0169-3298 (https://doi.org/10.1007/s10712-012-9205-z)

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Abstract

The French government has committed to launch the satellite TARANIS to study transient coupling processes between the Earth's atmosphere and near-Earth space. The prime objective of TARANIS is to detect energetic charged particles and hard radiation emanating from thunderclouds. The British Nobel prize winner C.T.R. Wilson predicted lightning discharges from the top of thunderclouds into space almost a century ago. However, new experiments have only recently confirmed energetic discharge processes which transfer energy from the top of thunderclouds into the upper atmosphere and near-Earth space; they are now denoted as transient luminous events, terrestrial gamma-ray flashes and relativistic electron beams. This meeting report builds on the current state of scientific knowledge on the physics of plasmas in the laboratory and naturally occurring plasmas in the Earth's atmosphere to propose areas of future research. The report specifically reflects presentations delivered by the members of a novel Franco-British collaboration during a meeting at the French Embassy in London held in November 2011. The scientific subjects of the report tackle ionization processes leading to electrical discharge processes, observations of transient luminous events, electromagnetic emissions, energetic charged particles and their impact on the Earth's atmosphere. The importance of future research in this area for science and society, and towards spacecraft protection, is emphasized.

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