Subject: Data Format Description for the IMP-J MAG60 Datatype in NDADS From: J. H. King Organization: National Space Science Data Center Entered as B46483 in NSSDC's Technical Reference File, January 12, 1998. ============================================================================= IMP-J MAG60 1.024 MINUTE AVERAGES Based on 15.36 second averages Imp-J MAG60 data are in ASCII format, record length = 209 bytes. Note: The time given in calendar day-of-year (Jan 1 = Day 1) beginning with 1992 data. Pre-1992 data is in Decimal Day-of-Year, where Jan 1 = Decimal Day 0. ============================================================================= ITEM FORMAT NOTES ==== ====== ===== 1 Year I3 (2 digit year) 2 Time f10.5 (floating point time = day.fraction) 3 Month A4 (ex. Jan) 4 Day of month I3 5 F1 F7.2 nanotesla (avg. of field magnitude) 6 F2* F7.2 nanotesla (field magnitude) 7 X F7.2 nanotesla (GSE coord.) 8 Y F7.2 nanotesla (GSE coord.) 9 Z F7.2 nanotesla (GSE coord.) 10 Y F7.2 nanotesla (GSM coord.) 11 Z F7.2 nanotesla (GSM coord.) 12 RMS(X) F9.2 nanotesla 13 RMS(Y) F9.2 nanotesla 14 RMS(Z) F9.2 nanotesla 15 RMS F9.2 nanotesla 16 space 1X 17 PHI F7.2 degrees (GSE coord.) 18 THETA F7.2 degrees (GSE coord.) 19 PHI F7.2 degrees (GSM coord.) 20 THETA F7.2 degrees (GSM coord.) 21 SCXE E11.3 km (SC POS GSE coord. - X) 22 SCYE E11.3 km (SC POS GSE coord. - Y) 23 SCZE E11.3 km (SC POS GSE coord. - Z) 24 SCYM E11.3 km (SC POS GSM coord. - Y) 25 SCZM E11.3 km (SC POS GSM coord. - Z) 26 R E11.3 km (radial distance) 27 NP I3 (number of pts in avg)** 28 Mode I2 (bit rate: 0=low,1=high) 29 DQF I2 (data quality flag) 30 Gap I2 (data gap flag) * F2 is Pythagorean mean of component average ** NP represents the aggregate number of 1.28 second averages in the 15.36 second averages that are used to develop the 1.024 minute averages and RMS's =============================================================================