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ISRN Astronomy and Astrophysics
Volume 2011 (2011), Article ID 727140, 6 pages
Research Article

On Some Properties of SEP Effective CMEs

1Astrophysics Research Group, Department of Physics, Meerut College, Meerut 250001, India
2Department of Physics, Sunder Deep Group of Institutions, Ghaziabad 201001, India
3Department of Physics, FIT Engineering College, Mawana Road, Meerut 250001, India

Received 2 November 2011; Accepted 27 November 2011

Academic Editor: M. Richmond

Copyright © 2011 Nishant Mittal et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Solar energetic particles (SEP) are believed to originate from two different sources, solar flares and coronal mass ejections (CMEs). The large SEP events constitute a serious radiation hazard. The high-energy solar proton data obtained from NOAA Space Environment Services Center are used to investigate some statistical properties such as speed, apparent width, acceleration, latitude, mass, kinetic energy, and occurrence rate of SEP effective CMEs observed during the period 1997–2006 covering the solar cycle 23. It is found that SEP effective CMEs are nearly halo in nature, and they follow solar cycle variation. Such CMEs have higher speeds than those of non-SEP effective CMEs.