Mesospheric ionization during substorm growth phase Kiyoka Murase, Ryuho Kataoka, Takanori Nishiyama, Koji Nishimura, Taishi Hashimoto, Yoshimasa Tanaka, Akira Kadokura, Yoshihiro Tomikawa, Masaki Tsutsumi, Yasunobu Ogawa et al. (17 more) J. Space Weather Space Clim., 12 (2022) 18 Published online: 06 June 2022 DOI: 10.1051/swsc/2022012