| he balloon-borne Superconducting Magnet Instrument for Light Isotopes flew for the second time on July 24-25, 1991 at the altitude of 36 km during conditions of extremely high solar modulation. The detector was designed to measure the charge, rigidity, and velocity of cosmic rays heavier than hydrogen within the kinetic energy range 100-2000 MeV/nucleon. The helium spectrum measured over this wide energy range is consistent with an interstellar helium spectrum expressed as a power law in the rigidity with spectral index of ;The ;The low kinetic energy ;The... |
