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Name Template: PUB/MISSION/level1a/ionGps/ionGps_YYYY.DDD.LLL.NN_bnx

DDDDay of year
IIIIMission ID (CHAM, SACC, CO01-06, GPSM, etc)
LLLLEO number (1-6 for COSMIC)
MISSIONMission ID (eight characters or less--champ, champrt, sacc, sacctst, etc)
NNDump number since midnight
PUBBase directory for the pub hierarchy
YYYYYear

One second ionospheric occultation data in COSMIC BINEX 0x7f format. This format is identical to that used for high rate atmospheric data. All that is different between the two files is the data rate specification, which for 1 second ionospheric data would appear as 1 Hz. This data file contains all data from the receiver taken at the ionospheric data rate (one second for GPS/MET and CHAMP; this filetype does not exist for COSMIC).