Funding for this research was provided by:
Japan Society for the Promotion of Science (core-to-core program, B. Asia-Africa Science Platforms, 15H05815; 16H06286)
Institute for Space-Earth Environmental Research, Nagoya University
Space Research and Technology Institute, Bulgarian Academy of Sciences
Received: 30 August 2020
Accepted: 25 January 2021
First Online: 9 March 2021
: The authors declare that they have no competing interests.