Subject: Data Format Description for the IMP-J MAG15_ASCII
F
Organization: National Space Science Data Center

Entered as B46482 in NSSDC's Technical Reference File, January 12, 1998.

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                  MAG15_ASCII Format and Footnotes
Data Format for Tri-Axis Magnetometer 15.36 Second Magnetic Field Vectors

Logical record size = 134 bytes
ITEM   Description      (Type)(Size)  Units      Notes
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 1*    Year                   I3                  Last two digits only
 2*    Day-of-year            I4      days        January 1 = 1
 3*    Seconds of day         I6      sec         Elapsed seconds of day
 4     Number of sequences    I3                  used for statistics**
 5     Number of detail pts   I4
 6     X Geocentric SE pos.   F6.1    Earth radii
       of spacecraft
 7     Y Geocentric SE pos.   F6.1    Earth radii
       of spacecraft
 8     Z geocentric SE pos.   F6.1    Earth radii
       of spacecraft
 9     Y Solar Magnetospheric F6.1    Earth radii
       position of spacecraft
10     Z Solar Magnetospheric F6.1    Earth radii
       position of spacecraft
11     Field Magnitude (F1)   F7.2    nT          F1 = 1/n sum[F_i] for i=1,N
       (Averaged over 15.36                        where F_i is
       seconds)                                   computed over 1.28 seconds
12     B_X_SE Avgd. over      F7.2    nT          B_X_SE is the same as B_X_SM.
       15.36 seconds
13     B_Y_SE Avgd. over      F7.2    nT
       15.36 seconds
14     B_Z_SE Avgd. over      F7.2    nT
       15.36 seconds
15     B_Y_SM Avgd. over      F7.2    nT
       15.36 seconds
16     B_Z_SM Avgd. over      F7.2    nT
       15.36 seconds
17     SQRT(Variance XX GSE)  F7.2    nT
18     SQRT(Variance YY GSE)  F7.2    nT
19     SQRT(Variance ZZ GSE)  F7.2    nT
20     SQRT(Variance YX GSE)  F7.2    nT
21     SQRT(Variance ZX GSE)  F7.2    nT
22     SQRT(Variance ZY GSE)  F7.2    nT
* Items 1 - 3 are for the last sequence included in the 15.36 second
  statistical computation.
** This time identifies the last 1.28-sec field value included in this average.
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