Preliminary results on the energetic particle directional distribution during quiet time periods of solar cycle 21 maximun - J. Rodríguez Pacheco; P. Király; J. Sequeiros; E. Bonchalo; S. Sánchez (Rayos cósmicos 98: proceedings of the 16th European Cosmic Ray Symposium, Alcalá de Henares, Spain, July 20-24 1998, 1998)