![]() | ![]() |
Astron. Astrophys. 322, 311-319 (1997) AcknowledgementsF.F. thanks the italian Consiglio Nazionale delle Ricerche for supporting this work with a 1995-96 fellowship. This research was developed inside a CNR-IFSI project on Cosmic Rays in the Heliosphere. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: June 30, 1998 ![]() |