Analysis of Blue Corona Discharges at the Top of Tropical Thunderstorm Clouds in Different Phases of Convection.

Autor: Dimitriadou K; National Space Institute, Technical University of Denmark (DTU Space) Kongens Lyngby Denmark., Chanrion O; National Space Institute, Technical University of Denmark (DTU Space) Kongens Lyngby Denmark., Neubert T; National Space Institute, Technical University of Denmark (DTU Space) Kongens Lyngby Denmark., Protat A; Australian Bureau of Meteorology, Science and Innovation Group Radar Science and Nowcasting Team Melbourne VIC Australia., Louf V; Australian Bureau of Meteorology, Science and Innovation Group Radar Science and Nowcasting Team Melbourne VIC Australia., Heumesser M; National Space Institute, Technical University of Denmark (DTU Space) Kongens Lyngby Denmark., Husbjerg L; National Space Institute, Technical University of Denmark (DTU Space) Kongens Lyngby Denmark., Köhn C; National Space Institute, Technical University of Denmark (DTU Space) Kongens Lyngby Denmark., Østgaard N; Birkeland Centre for Space Science University of Bergen Bergen Norway., Reglero V; Image Processing Laboratory University of Valencia Valencia Spain.
Jazyk: angličtina
Zdroj: Geophysical research letters [Geophys Res Lett] 2022 Mar 28; Vol. 49 (6), pp. e2021GL095879. Date of Electronic Publication: 2022 Mar 17.
DOI: 10.1029/2021GL095879
Abstrakt: We report on observations of corona discharges at the uppermost region of clouds characterized by emissions in a blue band of nitrogen molecules at 337 nm, with little activity in the red band of lightning leaders at 777.4 nm. Past work suggests that they are generated in cloud tops reaching the tropopause and above. Here we explore their occurrence in two convective environments of the same storm: one is developing with clouds reaching above the tropopause, and one is collapsing with lower cloud tops. We focus on those discharges that form a distinct category with rise times below 20 μs, implying that they are at the very top of the clouds. The discharges are observed in both environments. The observations suggest that a range of storm environments may generate corona discharges and that they may be common in convective surges.
(© 2022. The Authors.)
Databáze: MEDLINE
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