Highly dynamic gamma-ray emissions are common in tropical thunderclouds

M. Marisaldi (), N. Østgaard (), A. Mezentsev (), T. Lang, J. E. Grove, D. Shy, G. M. Heymsfield, P. Krehbiel, R. J. Thomas, M. Stanley, D. Sarria, C. Schultz, R. Blakeslee, M. G. Quick, H. Christian, I. Adams, R. Kroodsma, N. Lehtinen, K. Ullaland, S. Yang, B. Hasan Qureshi, J. Søndergaard, B. Husa, D. Walker, M. Bateman, D. Mach, S. Cummer, M. Pazos, Y. Pu, P. Bitzer, M. Fullekrug, M. Cohen, J. Montanya, C. Younes, O. Velde, J. A. Roncancio, J. A. Lopez, M. Urbani and A. Santos
Additional contact information
M. Marisaldi: University of Bergen
N. Østgaard: University of Bergen
A. Mezentsev: University of Bergen
T. Lang: NASA Marshall Space Flight Center
J. E. Grove: U.S. Naval Research Laboratory
D. Shy: U.S. Naval Research Laboratory
G. M. Heymsfield: NASA Goddard Space Flight Center
P. Krehbiel: New Mexico Institute of Mining and Technology
R. J. Thomas: New Mexico Institute of Mining and Technology
M. Stanley: New Mexico Institute of Mining and Technology
D. Sarria: University of Bergen
C. Schultz: NASA Marshall Space Flight Center
R. Blakeslee: NASA Marshall Space Flight Center
M. G. Quick: NASA Marshall Space Flight Center
H. Christian: University of Alabama in Huntsville
I. Adams: NASA Goddard Space Flight Center
R. Kroodsma: NASA Goddard Space Flight Center
N. Lehtinen: University of Bergen
K. Ullaland: University of Bergen
S. Yang: University of Bergen
B. Hasan Qureshi: University of Bergen
J. Søndergaard: University of Bergen
B. Husa: University of Bergen
D. Walker: University of Alabama in Huntsville
M. Bateman: University of Alabama in Huntsville
D. Mach: Universities Space Research Association
S. Cummer: Duke University
M. Pazos: National Autonomous University of Mexico (UNAM)
Y. Pu: Duke University
P. Bitzer: University of Alabama in Huntsville
M. Fullekrug: University of Bath
M. Cohen: Georgia Institute of Technology
J. Montanya: Polytechnic University of Catalonia
C. Younes: Universidad Nacional de Colombia
O. Velde: Polytechnic University of Catalonia
J. A. Roncancio: Polytechnic University of Catalonia
J. A. Lopez: Polytechnic University of Catalonia
M. Urbani: Polytechnic University of Catalonia
A. Santos: Universidad Nacional de Colombia

Nature, 2024, vol. 634, issue 8032, 57-60

Abstract: Abstract Thunderstorms emit fluxes of gamma rays known as gamma-ray glows1,2, sporadically observed by aircraft1,3–7, balloons8–11 and from the ground12–18. Observations report increased gamma-ray emissions by tens of percent up to two orders of magnitude above the background, sometimes abruptly terminated by lightning discharges1,3–5. Glows are produced by the acceleration of energetic electrons in high-electric-field regions within thunderclouds8 and contribute to charge dissipation3. Glows had been considered as quasi-stationary phenomena3,5,12, with durations up to a few tens of seconds and spatial scales up to 10–20 km. However, no measurements of the full extension in space and time of a gamma-ray-glow region and their occurring frequency have been reported so far. Here we show that tropical thunderclouds over ocean and coastal regions commonly emit gamma rays for hours over areas up to a few thousand square kilometres. Emission is associated with deep convective cores; it is not uniform and continuous but shows characteristic timescales of 1–10 s and even subsecond for individual glows. The dynamics of gamma-glowing thunderclouds strongly contradicts the quasi-stationary picture of glows and instead resembles that of a huge gamma-glowing ‘boiling pot’ in both pattern and behaviour.

Date: 2024
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DOI: 10.1038/s41586-024-07936-6

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