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Response of high-altitude clouds to the galactic cosmic ray cycles around tropical regions
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  • Hiroko Miyahara,
  • Kanya Kusano,
  • Ryuho Kataoka,
  • Emile Touber
Hiroko Miyahara
Musashino Art University, Musashino Art University

Corresponding Author:miyahara@musabi.ac.jp

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Kanya Kusano
Nagoya University, Nagoya University
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Ryuho Kataoka
National Institute of Polar Research, National Institute of Polar Research
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Emile Touber
Okinawa Institute of Science and Technology, Okinawa Institute of Science and Technology
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Galactic cosmic rays (GCRs) are among the possible mediators of the solar influence on climate and weather. However, the impacts of GCR-induced ions on cloud formation and climate systems are not fully understood. In this paper, we show that the high-altitude clouds around the tropical regions associated with deep convective activities are susceptive to the decadal cycle of GCRs and that their impact and responding areas are seasonally variable. The most notable responses were found in August over land areas, suggesting that the susceptivity of clouds to GCRs may be dependent on the depth of convective activities and the abundance of aerosol precursor materials. We suggest that the positive feedback mechanism may be strengthening the GCR–cloud connection, maximizing the impact of GCR cycles with a lag of 1 year.