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A Rapid Gamma‐Ray Glow Flux Reduction Observed From 20 km Altitude.

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Title: A Rapid Gamma‐Ray Glow Flux Reduction Observed From 20 km Altitude.
Authors: Kochkin, P.1 pavlo.kochkin@uib.no, Sarria, D.1, Lehtinen, N.1, Mezentsev, A.1, Yang, S.1, Genov, G.1, Ullaland, K.1, Marisaldi, M.1, Østgaard, N.1, Christian, H. J.2, Grove, J. E.3, Quick, M.4, Al‐Nussirat, S.2, Wulf, E.3
Source: Journal of Geophysical Research. Atmospheres. 5/16/2021, Vol. 126 Issue 9, p1-12. 12p.
Subject Terms: *Hydrologic cycle, *Radiative forcing, *Atmospheric aerosols, Microstructure, Optical depth (Astrophysics)
Abstract: Two gamma‐ray glows were observed by a high‐altitude NASA ER‐2 aircraft flying at 20 km altitude over a thunderstorm in Colorado, USA. The flux of the first glow rapidly intensified and then abruptly decreased within a few tens of milliseconds. On a timescale of seconds, the flux decrease occurred simultaneously with a hybrid intra‐cloud/cloud‐to‐ground lightning discharge beneath the aircraft. However, a more detailed analysis of the discharge dynamics indicated that the discharge activity was unusually calm during the actual period of the flux decrease. The lightning was observed with on‐board antennas, optical sensor, and ground‐based lightning mapping and location networks. Its closest activity was 12 km away from the aircraft, below and slightly ahead the course. The gamma‐ray flux reduction happened roughly in the middle of the lightning development process. The glow spectral analysis for the periods of a weak and strong flux enhancement has been done. The spectra were found to be background‐like and similar to each other. Key Points: A rapid reduction of a gamma‐ray glow flux was observed from an aircraft at 20 km altitudeThe reduction happened synchronously with a lightning discharge beneath the aircraft and lasted for a few tens of millisecondsSpectral analysis of the weak and the strong glow fluxes do not suggest their different production mechanism [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: A Rapid Gamma‐Ray Glow Flux Reduction Observed From 20 km Altitude.
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  Data: <searchLink fieldCode="AR" term="%22Kochkin%2C+P%2E%22">Kochkin, P.</searchLink><relatesTo>1</relatesTo><i> pavlo.kochkin@uib.no</i><br /><searchLink fieldCode="AR" term="%22Sarria%2C+D%2E%22">Sarria, D.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Lehtinen%2C+N%2E%22">Lehtinen, N.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Mezentsev%2C+A%2E%22">Mezentsev, A.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Yang%2C+S%2E%22">Yang, S.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Genov%2C+G%2E%22">Genov, G.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ullaland%2C+K%2E%22">Ullaland, K.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Marisaldi%2C+M%2E%22">Marisaldi, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Østgaard%2C+N%2E%22">Østgaard, N.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Christian%2C+H%2E+J%2E%22">Christian, H. J.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Grove%2C+J%2E+E%2E%22">Grove, J. E.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Quick%2C+M%2E%22">Quick, M.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Al‐Nussirat%2C+S%2E%22">Al‐Nussirat, S.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Wulf%2C+E%2E%22">Wulf, E.</searchLink><relatesTo>3</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Atmospheres%22">Journal of Geophysical Research. Atmospheres</searchLink>. 5/16/2021, Vol. 126 Issue 9, p1-12. 12p.
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  Data: *<searchLink fieldCode="DE" term="%22Hydrologic+cycle%22">Hydrologic cycle</searchLink><br />*<searchLink fieldCode="DE" term="%22Radiative+forcing%22">Radiative forcing</searchLink><br />*<searchLink fieldCode="DE" term="%22Atmospheric+aerosols%22">Atmospheric aerosols</searchLink><br /><searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+depth+%28Astrophysics%29%22">Optical depth (Astrophysics)</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Two gamma‐ray glows were observed by a high‐altitude NASA ER‐2 aircraft flying at 20 km altitude over a thunderstorm in Colorado, USA. The flux of the first glow rapidly intensified and then abruptly decreased within a few tens of milliseconds. On a timescale of seconds, the flux decrease occurred simultaneously with a hybrid intra‐cloud/cloud‐to‐ground lightning discharge beneath the aircraft. However, a more detailed analysis of the discharge dynamics indicated that the discharge activity was unusually calm during the actual period of the flux decrease. The lightning was observed with on‐board antennas, optical sensor, and ground‐based lightning mapping and location networks. Its closest activity was 12 km away from the aircraft, below and slightly ahead the course. The gamma‐ray flux reduction happened roughly in the middle of the lightning development process. The glow spectral analysis for the periods of a weak and strong flux enhancement has been done. The spectra were found to be background‐like and similar to each other. Key Points: A rapid reduction of a gamma‐ray glow flux was observed from an aircraft at 20 km altitudeThe reduction happened synchronously with a lightning discharge beneath the aircraft and lasted for a few tens of millisecondsSpectral analysis of the weak and the strong glow fluxes do not suggest their different production mechanism [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  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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        Value: 10.1029/2020JD033467
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      – Code: eng
        Text: English
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        PageCount: 12
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      – SubjectFull: Hydrologic cycle
        Type: general
      – SubjectFull: Radiative forcing
        Type: general
      – SubjectFull: Atmospheric aerosols
        Type: general
      – SubjectFull: Microstructure
        Type: general
      – SubjectFull: Optical depth (Astrophysics)
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      – TitleFull: A Rapid Gamma‐Ray Glow Flux Reduction Observed From 20 km Altitude.
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              Text: 5/16/2021
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