TY - JOUR T1 - Comparison of the He+ layer observed over Arecibo during solar maximum and solar minimum with CTIP model results JO - J GEOPHYS RES-SPACE PY - 2003/12/23 AU - Wilford CR AU - Moffett RJ AU - Rees JM AU - Bailey GJ AU - Gonzalez SA ED - DO - DOI: 10.1029/2003JA009940 VL - 108 IS - A12 Y2 - 2024/12/22 ER -