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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