Summary
We develop a numerical model of the cross-field diffusion of galactic cosmic rays into an interplanetary coronal mass ejection (ICME), on the assumption that the local part of the ICME is an expanding straight cylinder. It is found that the spatial distribution of cosmic ray density in the cylinder rapidly reaches a stationary state due to the balance between inward diffusion and adiabatic cooling in the expanding cylinder. By fitting the model to the Halloween ICME event observed with the network of muon detectors in October 2003, we evaluate the magnitude of the cross-field diffusion coefficient to be 1.7¡¿1021 cm2/s at ¡50 GeV.
Authors:Munakata K. Yasue S. Kato C. Kota J. Tokumaru M. Kojima M. Darwish A.A. Kuwabara T. Bieber J.W.
Published in: 2006
Category 1: Peer-reviewed literature
Program area: Space and Atmospheric Sciences
Munakata K., Yasue S., Kato C., Kota J., Tokumaru M., Kojima M., Darwish A.A., Kuwabara T., Bieber J.W.
(2006)
On the cross-field iffusion of galactic cosmic rays into an ICME,
Advances in Geoscience: Solar Terrestrial
2.
115-124;
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