IMP-8 Encyclopedia File Format
Each encyclopedia logical record is 2812 bytes long and contains one album
of data. Each physical record(block) contains three logical records or
8436 bytes. Each file contains three pre-specified 4-day intervals of data
and is uniquely defined by reel sequence number.
DEFINITIONS:
Absolute file number : a number assigned to each file on the
Experimenter file. Each file receives
an absolute file number one larger than
the previous file; therefore, each file
is distinctly defined.
Decom run number : the number of the job in which the data
was processed.
Interval : a pre-defined 4 day period used instead
of orbits to organize IMP-8 data.
Interval 1 begins at 00 hours on
Sept. 23, 1972; Interval 2 begins at
00 hours on Sept. 27, 1972; etc.
Reel sequence number : a unique number assigned to each file
which indicates the intervals on it,,
whether it is an original or a duplicate, and
the number of times it has
been updated. The reel sequence number
is of the form
NNNNNNDUU
where NNNNNN is the number of the file
in the series: number 1 contains intervals
1, 2 and 3; 2 contains 4, 5, and 6; etc.
D is the duplicate indicator; 0 is an
original and 1 is a duplicate; and
UU is the update number; when the file
is created, UU is equal to 01. It is
incremented by one each time the file is
updated or reprocessed.
HALF FULL (PRM)
WORD WORD WORD Frame SEQ PAGE ITEM
1 * 0 0 0 Universal Time(Tenths of sec of year)
2 * 0 0 0 Satellite clock
3 * 0 0 0 Pseudo-sequence count
4 * 0 0 0 Year
* 0 0 0 Day of year
5 * 0 0 0 Month
* 0 0 0 Day of month
6 * 0 0 0 milliseconds of Day
7 * Decom run Number
* Analog tape file number
8 * Decom file number
* Absolute file number
9 * Perigee count
Transmission rate(400 or 1600)
10 * Day of next perigee
11 * Msec of day, next perigee
12 * Station number
* Analog tape number
13 * Reel sequence number
14 * Longitude geocentric(deg.)
15 * Latitude
16 * Longitude geomagnetic(deg.)
17 * Latitude
18 * Ro(earth radii) (C.U.L.)
19 * Radial distance from center of earth(km)
20 * GSEx Satellite position in
21 * GSEy geocentric solar ecliptic
22 * GSEz coordinates(km)
23 * GSMx Satellite position in
24 * GSMy geocentric solar magnet-
25 * GSMz ospheric coordinates(km)
26 * GEIx Sun position in geocetric
27 * GEIy equatorial inertial(A.U.)
28 * GEIz
29 * L, McIlwain parameter(earth radii)
30 * B, Magnetic field strength(gamma)
31 * Lsep , Satellite-earth-sun angle(deg.)
32 * Half 1: Production flag
Half 2: # of 4-day interval
HALF FULL (PRM)
WORD WORD WORD Frame SEQ PAGE ITEM
33 * 4 5 0 DP a3-l7
0 Byte 1 - Page 0
1 Byte 2 - Page 1
2 Byte 3 - Page 2
3 Byte 4 - Page 3
2 redundant bits for SS1 followed
by 2 redundant bits for SS3
(right-justified in each byte)
34 * 0 6 Leakage current, APP6
0 Byte 1 - Page 0
1 Byte 2 - Page 1
2 Byte 3 - Page 2
3 Byte 4 - Page 3
35 * 5 4 MED temp, APP-36
1 Byte 1 - Page 1
3 Byte 2 - Page 3
Byte 3 - spare
Byte 4 - spare
36 * 0-15 0-15 0 Time quality flags
Byte 1 = Sequences 0-3
Byte 2 = Sequences 4-7
Byte 3 = Sequences 8-11
Byte 4 = Sequences 12-15
37 * 0-15 0-3 0 Data quality flags
Byte 1 = Sequence 0
Byte 2 = Sequence 1
Byte 3 = Sequence 2
Byte 4 = Sequence 3
38 * 0-15 4-7 0 Data quality flags: Seq. 4-7
39 * 0-15 8-11 0 " " " " 8-11
40 * 0-15 12-15 0 " " " " 12-15
41 * 3 0 0 Byte 1 LED(DS) Frame 3
11 0 0 Byte 2 LED(DS) Frame 11
3 1 0 Byte 3 LED(DS) Frame 3
11 1 0 Byte 4 LED(DS) Frame 11
42-48 * 3,11 2-15 0 LED(DS)
49 * 3 0 0 Byte 1 - MED(DS) Frame 3
11 0 0 Byte 2 - MED(DS) Frame 11
3 1 0 Byte 3 - MED(DS) Frame 3
11 1 0 Byte 4 - MED(DS) Frame 11
50-56 * 3,11 2-15 0 MED(DS)
57 * 3 0 0 LED(A)
* 11 0 0 LED(A)
58-72 * 3,11 1-15 0 LED(A)
73 * 3 0 0 LED(B)
* 11 0 0 LED(B)
74-88 * 3,11 1-15 0 LED(B)
HALF FULL (PRM)
WORD WORD WORD Frame SEQ PAGE ITEM
89 * 3 0 0 MED(D)
* 11 0 0 MED(D)
90-104 * 3,11 1-15 0 MED(D)
105 * 3 0 0 MED(E)
* 11 0 0 MED(E)
106-120 * 3,11 1-15 0 MED(E)
121 * 3 0 0 MED(F)
* 11 0 0 MED(F)
122-136 * 3,11 1-15 0 MED(F)
137 * 4 0 0 MED R1
138 * 4 8 0 MED R1
139 * 4 0 0 MED R2
140 * 4 8 0 MED R2
141 * 4 1 0 MED R3
142 * 4 9 0 MED R3
143 * 4 1 0 MED R4
144 * 4 9 0 MED R4
145 * 8 4 0 MED R5
146 * 8 12 0 MED R5
147 * 8 0 0 MED R6
148 * 8 8 0 MED R6
149 * 4 5 0 MED R7
150 * 4 13 0 MED R7
151 * 12 0 0 MED R8
152 * 12 8 0 MED R8
153 * 12 4 0 MED R9
154 * 12 12 0 MED R9
155 * 8 4 0 LED R1
156 * 8 12 0 LED R1
157 * 8 0 0 LED R2
158 * 8 8 0 LED R2
159 * 12 0 0 LED R3
160 * 12 8 0 LED R3
161 * 10 1 0 VLED R1
162 * 10 5 0 VLED R1
163 * 10 9 0 VLED R1
164 * 10 13 0 VLED R1
165 * 2 2 0 VLED R2
166 * 2 6 0 VLED R2
167 * 2 10 0 VLED R2
168 * 2 14 0 VLED R2
169 * 10 2 0 VLED R3
170 * 10 6 0 VLED R3
171 * 10 10 0 VLED R3
172 * 10 14 0 VLED R3
173 * 2 3 0 VLED R4
174 * 2 7 0 VLED R4
175 * 2 11 0 VLED R4
176 * 2 15 0 VLED R4
177 * 10 3 0 VLED R5
178 * 10 7 0 VLED R5
179 * 10 11 0 VLED R5
180 * 10 15 0 VLED R5
181-188 * 2 0 0 MED sectored rate(MSE, 1-8)
189-196 * 10 0 0 VLED sectored rate(VLSE, 1-8)
197 * 4 4 0 OA sun time
198 * 4 4 0 OA earth width
199 * 4 4 0 OA earth time
200 * 4 4 0 OA spin period
201 * 0 Byte 1:DPPa2-8
analog transmitter on/off.
last 4 bits contain 2
redundant bits for SS 0 followed
by 2 redundant bits for SS 1
Byte 2:same as byte 1 for SS 2
and SS 3
Byte 3:DPPa3-19
OA/TM slave
last 2 bits contain 2 redundant
bits for SS 1
Byte 4:same as byte 3 for SS 3
202-367 * 0-15 1 same as words 36-201 for page 1
368-533 * 0-15 2 same as words 36-201 for page 2
534-699 * 0-15 3 same as words 36-201 for page 3
700 * Year, time of orbit data
* Day of year
701 * Milliseconds of day
702 * Right ascension, spin vector in
celestial inertial
coordinates(deg.)
703 * Declination