Geometry of an interplanetary CME on October 29, 2003 deduced from cosmic rays

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Read Full Article (file size: 311991 bytes) Cited by GEOPHYSICAL RESEARCH LETTERS, VOL. 31, L19803, doi:10.1029/2004GL020803, 2004 Geometry of an interplanetary CME on October 29, 2003 deduced from cosmic rays T. Kuwabara Physics Department, Shinshu University, Matsumoto, Japan K. Munakata Physics Department, Shinshu University, Matsumoto, Japan S. Yasue Physics Department, Shinshu University, Matsumoto, Japan C. Kato Physics Department, Shinshu University, Matsumoto, Japan S. Akahane Physics Department, Shinshu University, Matsumoto, Japan M. Koyama Physics Department, Shinshu University, Matsumoto, Japan J. W. Bieber Bartol Research Institute, University of Delaware, Newark, Deleware, USA P. Evenson Bartol Research Institute, University of Delaware, Newark, Deleware, USA R. Pyle Bartol Research Institute, University of Delaware, Newark, Deleware, USA Z. Fujii Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan M. Tokumaru Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan M. Kojima Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan K. Marubashi National Institute of Information and Communications Technology, Tokyo, Japan M. L. Duldig Australian Antarctic Division, Kingston, Tasmania, Australia J. E. Humble School of Mathematics and Physics, University of Tasmania, Hobart, Tasmania, Australia M. R. Silva National Institute for Space Research (INPE/OES/CRSPE), Sao Jose dos Campos, Santa Maria, Brazil N. B. Trivedi National Institute for Space Research (INPE/OES/CRSPE), Sao Jose dos Campos, Santa Maria, Brazil W. D. Gonzalez Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan N. J. Schuch National Institute for Space Research (INPE/OES/CRSPE), Sao Jose dos Campos, Santa Maria, Brazil Abstract A coronal mass ejection (CME) associated with an X17 solar flare reached Earth on October 29, 2003, causing an ∼11% decrease in the intensity of high-energy Galactic cosmic rays recorded by muon detectors. The CME also produced a strong enhancement of the cosmic ray directional anisotropy. Based upon a simple inclined cylinder model, we use the anisotropy data to derive for the first time the three-dimensional geometry of the cosmic ray depleted region formed behind the shock in this event. We also compare the geometry derived from cosmic rays with that derived from in situ interplanetary magnetic field (IMF) observations using a Magnetic Flux Rope model. Received 21 June 2004; accepted 24 August 2004; published 6 October 2004. Index Terms: 2104 Interplanetary Physics: Cosmic rays; 2111 Interplanetary Physics: Ejecta, driver gases, and magnetic clouds; 2134 Interplanetary Physics: Interplanetary magnetic fields. Read Full Article (file size: 311991 bytes) Cited by Citation: Kuwabara, T., et al. (2004), Geometry of an interplanetary CME on October 29, 2003 deduced from cosmic rays, Geophys. Res. Lett., 31, L19803, doi:10.1029/2004GL020803. Copyright 2004 by the American Geophysical Union.

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