Statistical analyses of energetic (0.01--17 keV) upflowing ions (UFI), beams, conics, and hybrid pitch angle distributions, have been made using the energetic ion composition spectrometer (EICS) data on the DE 1 satellite for the 8000-km to 23,300-km altitude range over a 5-year period from September 1981 to June 1986. Hybrid types are defined here as combinations of lower-energy beams and higher-energy conics at three different energies (0.01--1, 1--4, and 4--17 keV). In general, it is found that (1) the source and transport mechanisms confine UFI mostly to auroral field lines; (2) although field-aligned currents and UFI events have similar frequencies of occurrence, no obvious (one-to-one) relationship between current direction and UFI source characteristics was found; (3) although H+ and O+ UFI spatial (latitude, local time, and altitude) distributions are similar, O+ is more efficiently accelerated than H+ at higher values of Kp; and (4) the electric potential drop along auroral field lines, which would accelerate ions away from the ionosphere, is small (<1 kV) except perhaps in the dusk to midnight sectors where on occasio large values (1--10 kV) may be present. ¿ American Geophysical Union 1990 |