期刊
GEOPHYSICAL RESEARCH LETTERS
卷 49, 期 6, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GL095879
关键词
blue corona discharges; convection; clouds; ASIM
资金
- ESA
- European Research Council [320839]
- Research Council of Norway [223252/F50]
- Ministerio Ciencia e Innovacion grant [ESP 2017 - 86263-C4]
- European Union [722337]
- national grant of Denmark
- national grant of Norway
- national grant of Spain
- European Research Council (ERC) [320839] Funding Source: European Research Council (ERC)
This study reports observations of corona discharges at the uppermost region of clouds, showing that they are present in various convective environments and may be common in convective surges.
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 mu s, 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.
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