期刊
GEOPHYSICAL RESEARCH LETTERS
卷 49, 期 13, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022GL098938
关键词
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资金
- European Research Council (ERC) under the European Union [681,257]
- European Union [SAINT 722337]
- Spanish Ministry of Science and Innovation, MINECO [PID2019-109269RB-C43]
- FEDER program
- State Agency for Research of the Spanish MCIU through the Center of Excellence Severo Ochoa award [SEV-20170709]
- CAS Project of Stable Support for Youth Team in Basic Research Field [YSRR-018]
- Chinese Meridian Project
- International Partnership Program of Chinese Academy of Sciences [183311KYSB20200003]
This study investigates lightning initiation inside thunderclouds by monitoring optical emissions and radio observations. The researchers uncover a new type of event that contains multiple optical and radio pulses. The first optical pulse coincides with a strong radio signal, while subsequent optical pulses, delayed by milliseconds, have weaker radio signals, indicating a difference between isolated electrical discharges and lightning-initiating discharges.
How lightning initiates inside thunderclouds remains a major puzzle of atmospheric electricity. By monitoring optical emissions from thunderstorms, the Atmosphere-Space Interactions Monitor (ASIM) onboard the International Space Station is providing new clues about lightning initiation by detecting Blue LUminous Events (BLUEs), which are manifestations of electrical corona discharges that sometimes precedes lightning. Here we combine optical and radio observations from a thunderstorm near Malaysia to uncover a new type of event containing multiple optical and radio pulses. We find that the first optical pulse coincides with a strong radio signal in the form of a Narrow Bipolar Event (NBE) but subsequent optical pulses, delayed some milliseconds, have weaker radio signals, possibly because they emanate from a horizontally oriented electrical discharges which does not trigger full-fledged lightning. Our results cast light on the differences between isolated and lightning-initiating electrical discharges.
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