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The August 24, 2002 coronal mass ejection: when a western limb event connects to earth

Published online by Cambridge University Press:  01 September 2008

Noé Lugaz ,
Ilia I. Roussev  and
Igor V. Sokolov
Noé Lugaz
Affiliation:
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Dr., Honolulu, HI, 96822, USA email: nlugaz@ifa.hawaii.edu, iroussev@ifa.hawaii.edu
Ilia I. Roussev
Affiliation:
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Dr., Honolulu, HI, 96822, USA email: nlugaz@ifa.hawaii.edu, iroussev@ifa.hawaii.edu
Igor V. Sokolov
Affiliation:
Department of AOSS, University of Michigan, 2455 Hayward St., Ann Arbor, MI 48198 email: igorosk@umich.edu
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Abstract

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We discuss how some coronal mass ejections (CMEs) originating from the western limb of the Sun are associated with space weather effects such as solar energetic particles (SEPs), shocks or geo-effective ejecta at Earth. We focus on the August 24, 2002 coronal mass ejection, a fast (~2000 km s−1) eruption originating from W81. Using a three-dimensional magneto-hydrodynamic simulation of this ejection with the Space Weather Modeling Framework (SWMF), we show how a realistic initiation mechanism enables us to study the deflection of the CME in the corona and the heliosphere. Reconnection of the erupting magnetic field with that of neighboring streamers and active regions modify the solar connectivity of the field lines connecting to Earth and can also partly explain the deflection of the eruption during the first tens of minutes. Comparing the results at 1 AU of our simulation with observations by the ACE spacecraft, we find that the simulated shock does not reach Earth, but has a maximum angular span of about 120°, and reaches 35° West of Earth in 58 hours. We find no significant deflection of the CME and its associated shock wave in the heliosphere, and we discuss the consequences for the shock angular span.

Keywords

Sun: coronal mass ejections (CMEs)solar-terrestrial relationsacceleration of particles
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S257: Universal Heliophysical Processes , September 2008 , pp. 391 - 398
Copyright
Copyright © International Astronomical Union 2009

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