https://spdf.gsfc.nasa.gov/pub/data/ibex/hi/time_series/direct_events/band_2/aareadme.txt

This directory provides 8-day (full IBEX orbit) 
"direct event" files produced by the IBEX-Hi instrument
in energy band 2.  Energy band 2 covers 0.52-0.95 keV.

See the readme files in parent directories, and the 
IBEX team-generated documentation files contained in those
directories.