Copyright WDC C1 for STP at RAL.
The meaning of the fields in the database files is as follows;
Time - 5 components: year (2 digits) month day hour minute SC - spacecraft number (see "Further information") Mag_field - magnetic field (nT) in GSM coordinates Sigma_mag - error in magnetic field N_mag - number of measurements of magnetic field Omega - rotation angle between GSE and GSM coordinates Density - plasma density (ions/cm**3) Speed - solar wind bulk flow speed (km/s) Fl_lng - bulk flow longitude (degrees - positive from west) GSE Fl_lat - bulk flow latitude (degrees - positive from south) GSE S_den - error in plasma density S_vel - error in flow speed S_long - error in flow longitude S_lat - error in flow latitude N_den - number of measurements of plasma density N_vel - number of measurements of flow speed N_long - number of measurements of flow longitude N_lat - number of measurements of flow latitude Position - position of spacecraft as GSE x, y and z coordinates in - units of Re, the earth's equatorial radius.