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Different Types of Corona Discharges Associated With High‐Altitude Positive Narrow Bipolar Events Nearby Cloud Top.

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Title: Different Types of Corona Discharges Associated With High‐Altitude Positive Narrow Bipolar Events Nearby Cloud Top.
Authors: Li, Dongshuai1,2 (AUTHOR) dongshuai@space.dtu.dk, Luque, Alejandro1 (AUTHOR) aluque@iaa.es, Gordillo‐Vazquez, F. J.1 (AUTHOR), Pérez‐Invernón, F. J.1 (AUTHOR), Husbjerg, Lasse Skaaning2 (AUTHOR), Neubert, Torsten2 (AUTHOR), Chanrion, Olivier2 (AUTHOR), Lu, Gaopeng3 (AUTHOR), Zhang, Hongbo4 (AUTHOR), Han, Jing5 (AUTHOR), Lehtinen, Nikolai G.6 (AUTHOR), Østgaard, Nikolai6 (AUTHOR), Reglero, Víctor7 (AUTHOR)
Source: Journal of Geophysical Research. Atmospheres. 2/27/2023, Vol. 128 Issue 4, p1-18. 18p.
Subject Terms: *Thunderstorms, Corona discharge, Cloud droplets, Cumulonimbus, Space stations, Radio frequency
Geographic Terms: Malaysia
Abstract: Single‐ and multi‐pulse blue corona discharges are frequently observed in thunderstorm clouds. Although we know they often correlate with Narrow Bipolar Events (NBEs) in Very Low Frequency/Low Frequency radio signals, their physics is not well understood. Here, we report a detailed analysis of different types of blue corona discharges observed by the Atmosphere‐Space Interactions Monitor during an overpass of a thundercloud cell nearby Malaysia. Both single‐ and multi‐pulse blue corona discharges were associated with positive NBEs at the top of the cloud, reaching about 18 km altitude. We find that the primary pulses of multi‐pulse discharges have weaker current moments than the single‐pulse discharges, suggesting that the multi‐pulse discharges either have shorter vertical channels or have weaker currents than the single‐pulse discharges. The subsequent pulse trains of the multi‐pulse discharges delayed some milliseconds are likely from horizontally oriented electrical discharges, but some NBEs, correlated with both single‐and multi‐pulse discharges, include small‐amplitude oscillations within a few microseconds inside their waveforms, which are unresolved in the optical observation and yet to be understood. Furthermore, by jointly analyzing the optical and radio observations, we estimate the photon free mean path at the cloud top to be ∼6 m. Plain Language Summary: Recent studies indicate that the blue corona discharges detected by the Atmosphere‐Space Interactions Monitor onboard the international space station have close association with a special type of intracloud discharges named Narrow Bipolar Events (NBEs). In this study, we present a detailed analysis of different types of NBE‐associated corona discharges detected by both optical and radio observations. All the detected corona discharges are found to be associated with unusual high‐altitude positive NBEs, which located a few kilometers below the cloud top where the cloud droplets have low impact on the optical observation. This allowed us to infer the physical properties of them and their parent thundercloud by using theoretical models. The results can provide important reference to further investigate the physical mechanism of corona discharge and their role in lightning initiations. Key Points: Corona discharges are found to be associated with unusual high‐altitude positive narrow bipolar events nearby cloud topCorona discharges are classified into different types according to their different optical and radio featuresThe detailed features of corona discharges and their parent thundercloud are estimated using different theoretical models [ABSTRACT FROM AUTHOR]
Copyright of Journal of Geophysical Research. Atmospheres is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Different Types of Corona Discharges Associated With High‐Altitude Positive Narrow Bipolar Events Nearby Cloud Top.
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  Data: <searchLink fieldCode="AR" term="%22Li%2C+Dongshuai%22">Li, Dongshuai</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> dongshuai@space.dtu.dk</i><br /><searchLink fieldCode="AR" term="%22Luque%2C+Alejandro%22">Luque, Alejandro</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> aluque@iaa.es</i><br /><searchLink fieldCode="AR" term="%22Gordillo‐Vazquez%2C+F%2E+J%2E%22">Gordillo‐Vazquez, F. J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pérez‐Invernón%2C+F%2E+J%2E%22">Pérez‐Invernón, F. J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Husbjerg%2C+Lasse+Skaaning%22">Husbjerg, Lasse Skaaning</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Neubert%2C+Torsten%22">Neubert, Torsten</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chanrion%2C+Olivier%22">Chanrion, Olivier</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lu%2C+Gaopeng%22">Lu, Gaopeng</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Hongbo%22">Zhang, Hongbo</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Han%2C+Jing%22">Han, Jing</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lehtinen%2C+Nikolai+G%2E%22">Lehtinen, Nikolai G.</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Østgaard%2C+Nikolai%22">Østgaard, Nikolai</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Reglero%2C+Víctor%22">Reglero, Víctor</searchLink><relatesTo>7</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Atmospheres%22">Journal of Geophysical Research. Atmospheres</searchLink>. 2/27/2023, Vol. 128 Issue 4, p1-18. 18p.
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  Data: *<searchLink fieldCode="DE" term="%22Thunderstorms%22">Thunderstorms</searchLink><br /><searchLink fieldCode="DE" term="%22Corona+discharge%22">Corona discharge</searchLink><br /><searchLink fieldCode="DE" term="%22Cloud+droplets%22">Cloud droplets</searchLink><br /><searchLink fieldCode="DE" term="%22Cumulonimbus%22">Cumulonimbus</searchLink><br /><searchLink fieldCode="DE" term="%22Space+stations%22">Space stations</searchLink><br /><searchLink fieldCode="DE" term="%22Radio+frequency%22">Radio frequency</searchLink>
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  Label: Geographic Terms
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  Data: <searchLink fieldCode="DE" term="%22Malaysia%22">Malaysia</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Single‐ and multi‐pulse blue corona discharges are frequently observed in thunderstorm clouds. Although we know they often correlate with Narrow Bipolar Events (NBEs) in Very Low Frequency/Low Frequency radio signals, their physics is not well understood. Here, we report a detailed analysis of different types of blue corona discharges observed by the Atmosphere‐Space Interactions Monitor during an overpass of a thundercloud cell nearby Malaysia. Both single‐ and multi‐pulse blue corona discharges were associated with positive NBEs at the top of the cloud, reaching about 18 km altitude. We find that the primary pulses of multi‐pulse discharges have weaker current moments than the single‐pulse discharges, suggesting that the multi‐pulse discharges either have shorter vertical channels or have weaker currents than the single‐pulse discharges. The subsequent pulse trains of the multi‐pulse discharges delayed some milliseconds are likely from horizontally oriented electrical discharges, but some NBEs, correlated with both single‐and multi‐pulse discharges, include small‐amplitude oscillations within a few microseconds inside their waveforms, which are unresolved in the optical observation and yet to be understood. Furthermore, by jointly analyzing the optical and radio observations, we estimate the photon free mean path at the cloud top to be ∼6 m. Plain Language Summary: Recent studies indicate that the blue corona discharges detected by the Atmosphere‐Space Interactions Monitor onboard the international space station have close association with a special type of intracloud discharges named Narrow Bipolar Events (NBEs). In this study, we present a detailed analysis of different types of NBE‐associated corona discharges detected by both optical and radio observations. All the detected corona discharges are found to be associated with unusual high‐altitude positive NBEs, which located a few kilometers below the cloud top where the cloud droplets have low impact on the optical observation. This allowed us to infer the physical properties of them and their parent thundercloud by using theoretical models. The results can provide important reference to further investigate the physical mechanism of corona discharge and their role in lightning initiations. Key Points: Corona discharges are found to be associated with unusual high‐altitude positive narrow bipolar events nearby cloud topCorona discharges are classified into different types according to their different optical and radio featuresThe detailed features of corona discharges and their parent thundercloud are estimated using different theoretical models [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Geophysical Research. Atmospheres is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1029/2022JD037883
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      – Code: eng
        Text: English
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        PageCount: 18
        StartPage: 1
    Subjects:
      – SubjectFull: Thunderstorms
        Type: general
      – SubjectFull: Corona discharge
        Type: general
      – SubjectFull: Cloud droplets
        Type: general
      – SubjectFull: Cumulonimbus
        Type: general
      – SubjectFull: Space stations
        Type: general
      – SubjectFull: Radio frequency
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      – SubjectFull: Malaysia
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      – TitleFull: Different Types of Corona Discharges Associated With High‐Altitude Positive Narrow Bipolar Events Nearby Cloud Top.
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              Text: 2/27/2023
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