3 Populations

• The Ring Current is well understood. Radial transport adiabatically heats the particles

• The 100 keV ions are probably “nose” ions

  • pancake distribution, predominately H+, “monoenergetic”, NOT adiabatically heated

• What is the lowest trace!!!???

  • field-aligned, 40 keV, enriched in O+
  • Energy stays nearly constant at 1/2 of “nose” ions!

• (Also seen March 21, 96; preferentially at equinox?)

Notes: