https://spdf.gsfc.nasa.gov/pub/data/ibex/hi/aareadme_ibex_hi.txt

[Note added November, 2010:  Material below was created after
submission by the IBEX team of the first 6-months of data
(Release 1).  Release 2 contained only IBEX-Hi map data,
but a richer ensemble thereof than in Release 1.  See further 
details in readme files of underlying subdirectories.]

This directory provides subdirectories containing various 
data types produced by the IBEX-Hi instrument, namely
time series, maps, and calibration data.  This readme file 
provides below a brief description of the IBEX-Hi instrumentation 
and further references.

The IBEX-Hi instrument measures ENA's in six energy bands within 
the 0.38-6.0 keV range.  The instrument is a single-pixel imager 
with a 6.5 x 6.5 deg field of view that images a 6.5 x 360 swath
of the sky each 15-sec spacecraft spin about the sun-pointing spin 
axis.  The six energy windows have FWHM ranges of 0.38-0.59, 
0.52-0.95, 0.84-1.55, 1.36-2.50, 1.99-3.75, 3.13-6.00 keV.  These 
are referred to as bands 1 to 6, respectively, in data products.  
In normal operation, 2 successive spins are devoted to each energy 
window every 12 spin (~3 min) periods.  More complete 
documentation on IBEX-Hi is available from

https://ui.adsabs.harvard.edu/abs/2009SSRv..146...75F/abstract

and from

https://link.springer.com/article/10.1007/s11214-009-9504-y

The Interstellar Boundary Explorer High Energy (IBEX-Hi) Neutral Atom Imager.
H. O. Funsten, et al. , Science Reviews, volume 146, pages 75–103 (2009)
DOI: 10.1007/s11214-009-9504-y