SPACECRAFT 
ts1 - tracers1 (data files renamed on SPDF site)
ts2 - tracers2 (data files renamed on SPDF site)

REGIONS
BOR- backorbit 
ROI- region of interest

note: Only MAG and MAGIC have separate BOR & ROI  cdfs, they are combined into one 
CDF for the other datasets.

INSTRUMENTS
ACI - Analyzer of Cusp Ions
ACE- Analyzer of Cusp Electrons
EFI - Electric Fields Instrument
MAG - Fluxgate Magnetometer
MAGIC - MAGnetometers for Innovation and Capability
MSC - Magnetic search coil

DATASET SUFFIXES
BAC - B (magnetic) field and "ac" is for AC as in alternating current
BDC - B (magnetic) field and "dc" is for DC as in direct current
EAC - E (electric) field and "ac" is for AC as in alternating current
EDC - E (electric) field and "dc" is for DC as in direct current
IPD - Ion Particle Distribution (dataset)
DEF- Differential Energy Fluxes

COORDINATE FRAMES, for more detail on frames see appendix of 
https://doi.org/10.1007/s11214-025-01199-x

GEOPHYSICAL FRAMES 
GEI - Geocentric Equatorial Inertial
GEO - Geographic
GSE - Geocentric Solar Ecliptic
GSM - Geocentric Solar Magnetic
SM - Solar Magnetic
MAG - Geomagnetic
FAC - Field-Aligned Coordinates

SPACECRAFT-SPECIFIC FRAMES
FVC - Field Velocity Coordinates 
TFS - TRACERS Field Sun 
TSS - TRACERS Spin Sun
TSCS - TRACERS Spacecraft Coordinate System (body fixed so rotates with spacecraft)
TBS - TRACERS Spinning Body (also body fixed so rotates with spacecraft)
NEC - North East Center