This info came from: mag_data_4min_2283.hdf

MAG 4-minute Averaged Interplanetary Magnetic Field Data.

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Time
(UT)		 year day hour min sec
year (float) day (float) ACEepoch SC clock  
Magnetic
Field
(nT)		 BR (RTN) BT (RTN) BN (RTN)  
<|B|> RTN Lat. RTN Long.  
Bx (GSE) By (GSE) Bz (GSE)  
Bx (GSM) By (GSM) Bz (GSM) delta-B (rms) sigma-B
Quality
flags		 fraction good # Data points Quality  
Spacecraft
Position		 GSE_x GSE_y GSE_z  
GSM_x GSM_y GSM_z  

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Plotting options (ignored for data downloads)
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Y-axis Scaling: Logarithmic Linear    
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Y-axis Range: Same scale for all stacked plots with common units.

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MAG Level2 Data Main Page

ACE Science Center Home Page

Vdata Name Class Number of Records Number of Fields
MAG_data_4min ACE MAG level2_data_4min 9720 32