Why do fast and wide CMEs not always produce observable solar energetic particles?

David Lario, NASA Goddard Space Flight Center, Heliophysics Science Division, Greenbelt, MD, United States, Ryun Young Kwon, KASI Korea Astronomy and Space Science Institute, Daejeon, South Korea, Laura Balmaceda, George Mason University, Fairfax, VA, United States, Ian G Richardson, NASA Goddard Space Flight Center, Greenbelt, MD, United States; University of Maryland College Park, Department of Astronomy, College Park, MD, United States, Ming Zhang, Florida Institute of Technology, Melbourne, FL, United States, Lulu Zhao, Florida Institute of Technology, Department of Physics and Space Sciences, Melbourne, FL, United States, Vratislav Krupar, Universities Space Research Association Columbia, Columbia, MD, United States and Barbara J Thompson, NASA/GSFC, Greenbelt, MD, United States