Spectrum of Low-Rigidity Cosmic Rays during the Solar Flare of February 23, 1956

By combining previously reported high-altitude total intensity data from balloon flights at Minneapolis and Iowa City it is found that the magnetic rigidity spectrum of solar flare particles at 2100 G.M.T. on February 23, 1956 (17 hours after onset of the event) was steeply rising toward low rigidities as about $R^{-5\mathrm{}}$ for rigidities $R$ of about 1.2 Bv. The flare data at high altitude and high latitude are compared with low-altitude neutron monitor data.