Table 3. Fluence Measurement Intervals Event Flare Date Onset Time High-Energy SEP Start High-Energy SEP End 1 10/26/03 1721 1800 on 10/26 1000 on 10/28 2 10/28/03 1100 1100 on 10/28 2000 on 10/29 3 10/29/03 2037 2100 on 10/29 2400 on 10/31 4 11/2/03 1703 1700 on 11/2 2000 on 11/4 5 11/4/03 1929 2100 on 11/4 1200 on 11/7