Butterfly Pitch Angle Distributions Observed by ISEE-1 by Theodore A. Fritz a,* , Mohamed Alothman a,b , Jyotirmoyee Bhattacharjya a , David L. Matthews a , and Jiasheng Chen a a Center for Space Physics, Boston University, 725 Commonwealth Ave., Boston, MA 02215 b Department of Physics, University of Bahrain, P.O. Box 32038, Isa Town, Bahrain * Corresponding Author: fax- 617-353-6463, e-mail- fritz@bu.edu 1