[P-EM09] Space Weather and Space Climate

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

*増田 吉起¹、宗像 一起¹、加藤 千尋¹、林 優希¹、片岡 龍峰³、門倉 昭^3,2、小財 正義²、三宅 晶子⁴、岩井 一正⁵、Mendonça Rafael⁶、Echer Ezequiel⁶、Lago Alisson⁶、Rockenbach M⁶、Schuch N⁶、Bageston José⁶、Braga Carlos⁷、Jassar H⁸、Sharma Madan⁸、Duldig Marc⁹、Humble J⁹、Evenson Paul¹⁰、Sabbah Ismail¹¹ (1.信州大学大学院　総合理工学研究科、2.情報・システム研究機構 データサイエンス共同利用基盤施設　極域環境データサイエンスセンター、3.国立極地研究所、4.茨城工業高等専門学校、5.名古屋大学　宇宙地球環境研究所、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)

キーワード：宇宙線、宇宙天気、磁気嵐、コロナ質量放出、スターリンク衛星、Global Muon Ditector Network

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.