https://spdf.gsfc.nasa.gov/pub/data/ibex/release3/lo/maps/aareadme.txt

This directory provides subdirectories containing files of both digital and image (png) versions of maps of ENA fluxes in the 5th, 6th, and 7th energy bands of IBEX-Lo, centered at 197, 451, and 908 eV respectively.  This directory also includes a descriptive file created by the IBEX team.

Each full-sky map takes 6-months to accumulate, owing to the way only a single 7 deg wide swath of sky is seen during a given 8-day orbit while the spin axis is sunward pointing.  Near each perigee, the spin vector direction is adjusted to regain its sun-pointing character.

The sky is binned into 720 0.5 deg longitude bins by 30 5-deg latitude bins, in J2000 ecliptic coordinates, and 6-month-accumulated/averaged ENA (hydrogen) fluxes in each bin are given in the data files.

Files are named as LoMap-oBBB-oCCC-eD-de-ht-flux.EEE, where

BBB is the orbit number of the first orbit contributing to the files

CCC is the orbit number of the last orbit contributing to the files

(BBB and CCC do not include leading zeroes; BBB=9 for 9th orbit..)

D gives the energy band number (5, 6, 7) 

EEE is "txt" for the digital files, "png" for the images