Companion dataset for manuscript titled "An Empirical Model for Mercury’s Field-Aligned Currents Derived from MESSENGER Magnetometer Data" submitted to JGR: Space Physics. The file MESSENGER_MAG_Disturbance_Indices_v12.txt defines the Mercury disturbance index as a function of MESSENGER orbit number. The file rsuns.txt defines the Mercury’s Heliocentric distance as a function of time. The file merge_magrdr_11083_15120_actidx_kt17res.txt contain the processed MESSENGER magnetometer vectors. This file is further broken into quintiles based on the disturbance index.

The file format for merge_magrdr_11083_15120_actidx_kt17res.txt is yrdoy,met,orbit,rsun,rss,x,y,z,bx,by,bz,bxm,bym,bzm,btm,dbx,dby,dbz,dbt With vector quantities being in the MSO coordinate system. Distances are in units of Mercury radii and magnetic fields are in units of nT. The file rsuns.txt contains two fields. The first is the UTC date and time and the second is Mercury's heliocentric distance in units of AU.