Enhancement of 0.24-0.96-MeV Trapped Protons During the 25 May 1967 Magnetic Storm.

During the large 25 May 1967 magnetic storm, a solid-state detector spectrometer, aboard the polar-orbiting satellite OV1-9, measured 0.24 to 0.96 MeV protons. A nonadiabatic, semipermanent enhancement of protons was observed following the storm in the region 2.50 L 3.25, B 0.10 plus or minus 0.02, at LT 1800 hr. The 0.265-MeV proton flux increased by about a factor of 25, while the 0.885-MeV proton flux increased by a factor of 4 to 5. Author