[P-EM09] Space Weather and Space Climate

[PEM09-P08] Galactic cosmic ray variations associated with February 2022 “Starlink” magnetic storms

*Yoshiki Masuda¹, Kazuoki Munakata¹, Chihiro Kato¹, Yuki Hayashi¹, Ryuho Kataoka³, Akira Kadokura^3,2, Masayoshi Kozai², Shoko Miyake⁴, Kazumasa Iwai⁵, Rafael Mendonça⁶, Ezequiel Echer⁶, Alisson Dal Lago⁶, M Rockenbach⁶, N J Schuch⁶, José Valentin Bageston⁶, Carlos Roberto Braga⁷, H Jassar⁸, Madan Sharma⁸, Marc Duldig⁹, J E Humble⁹, Paul Evenson¹⁰, Ismail Sabbah¹¹ (1.Physics Department, Shinshu University, Matsumoto, Japan, 2.Polar Environment Data Science Center, Joint Support-Center for Data Science Research, Research Organization of Information and Systems, 3.National Institute of Polar Research, Tachikawa, Japan, 4.Department of Electrical and Electronic Systems Engineering, National Institute of Technology, Ibaraki College, Ibaraki, Japan,, 5.Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan, 6.National Institute for Space Research, São José dos Campos, Brazil, 7.George Mason University, Fairfax, VA, USA, 8.Physics Department, Kuwait University, Kuwait City, Kuwait, 9.School of Natural Sciences, University of Tasmania, Hobart, Australia, 10.Bartol Research Institute, Department of Physics and Astronomy, University of Delaware, Newark, DE, USA, 11.Department of Applied Sciences, College of Technological Studies, Public Authority for Applied Education and Training, Shuwaikh, Kuwait)

Keywords:cosmic ray, space wether, magnetic storms, ICME, Starlink, GMDN

A bunch of Starlink satellites was launched after the peak of the first magnetic storm at 18:13 (UT) on February 3, and 38 of the 49 satellites re-entered the atmosphere associated with moderate magnetic storms.
A global network of the ground-based multidirectional muon detectors, the Global Muon Detector Network (GMDN), has been continuously monitoring the intensity of cosmic rays arriving at Earth from various directions in space and identified the Forbush decrease events associated with the interplanetary shock and coronal mass ejections (ICMEs) which caused the sequence of “Starlink” magnetic storms. In this study, we report the initial results of analyzing the GMDN data around the February 2022 event, to discuss the complex magnetic structure of the ICMEs.