Geomagnetic avtivity triggered by interplanetary shocks: The shock impact angle as a controlling factor

Denny M. Oliveira, University of Maryland Baltimore County, Baltimore, United States, Joachim Raeder, University of New Hampshire Main Campus, Durham, NH, United States, Bruce Tsurutani, NASA Jet Propulsion Laboratory, Pasadena, CA, United States and Jesper W Gjerloev, Applied Physics Laboratory Johns Hopkins, Laurel, MD, United States