Voyager 1 and 2 LECP Pages

Fundamental Technologies

Voyager LECP Pages

STEP and STEPF Files

Definitions and Naming Convention

The files are prepared from the FAT (STEP) and filtered FAT (STEPF) binary files. The FAT files are step-synchronous averages of the LECP data. All data samples that occur within a specific motor position are averaged. If no data are read out in a given motor position, the datum will be absent. This file has one record for each motor position. If the LECP instrument is parked, then records are generated every 24 seconds with the motor position unchanging. Filtered FAT files are generated by comparing the rates derived from the MRT files with a “reasonable” maximum rate. Data that exceed the expected maximum are omitted from the averages.

First Line Sample: VOYAGER1,PRINTED,10-AUG-01,15:18:12,V177250A76.lst

(START)YYYY DD HH MM SEC (STOP) YYY DD HH MM SEC SECTOR N*(Item, Unc.)
where N* repeats the item and its uncertainty. The files are created in two systems of units, rates and fluxes. The naming conventions for these files are:

SSYYDDD(G,F)SGG.LST or SSYYDDDSGG.CSV where:

SS = V1 or V2
YY = two digit year number (77 through Present)
DDD = three digit day of year (for file start time)
(G,F) is an optional character which is present in the STEPF files to indicate that filtering has been applied
“S” = Stands for ASCII Listing of “Step” Files
GG = Group number from table below.

Grp. #	Col. 1	Col.2	Col. 3	Col.3	Col. 5	Col. 6	Descriptions
1	18	19	20	21	22		PL01,2,3,4,5 Rates
2	23	24	25	44	45		PL06,7,8,AL01,2 Rates
3	1	3	5	7	9		EB01,2,3,4,5 Rates
4	2	4	6	8	10		EB'01,2,3,4,5 Rates
5	11	12	13	14			EG06,7,8,9 Rates
6	34	50	36	52			E0 (E1) , D1F1, D1F2 Rates
7	26	35	46	51	60		E0 E2 (E3) Rates
8	27	28	29	53	54		Protons, Mediums Rates
9	37	38	47	61	62		Alphas, L Nuclei, H Nuclei Rates
10	39	40	48	55	63		Alphas, L Nuclei, H Nuclei Rates
11	15	16	17	33			E44, E45, E37, P31 Rates
12	30	31	42	58	66		E5 E4 (E3) Rates
13	32	43	59	67			E5 E4 E3 E2 Rates
14	41	49	56	57	64	65	E5 E4 (E3) Rates
15	68	75	76	74	73		Singles Rates
16	69	70	71	72			Singles Rates
17	83	84	85	97	98	99	Pd09,10,11, A d03,04,Z d01 Rates
18	80	81	82	94	95	96	Pd’09,10,11, A d’03,04,Z d’01 Rates
19	77	88	89	90			ESA0, PSA1, PSA2, PSA3 Rates
20	78	91	92	93			ESB0, PSB1, PSB2, PSB3 Rates
21	79	86	87				AB10, AB12, AB13 Rates
22	18	19	20	21	22		PL01,2,3,4,5 Fluxes
23	23	24	25	44	45		PL06,7,8,AL01,2 Fluxes
24	1	3	5	7	9		EB01,2,3,4,5 Fluxes
25	2	4	6	8	10		EB'01,2,3,4,5 Fluxes
26	11	12	13	14			EG06,7,8,9 Fluxes
27	34	50	36	52			E0 (E1) , D1F1, D1F2 Fluxes
28	26	35	46	51	60		E0 E2 (E3) Fluxes
29	27	28	29	53	54		Protons, Mediums Fluxes
30	37	38	47	61	62		Alphas, L Nuclei, H Nuclei Fluxes
31	39	40	48	55	63		Alphas, L Nuclei, H Nuclei Fluxes
32	15	16	17	33			E44, E45, E37, P31 Fluxes
33	30	31	42	58	66		E5 E4 (E3) Fluxes
34	32	43	59	67			E5 E4 E3 E2 Fluxes
35	41	49	56	57	64	65	E5 E4 (E3) Fluxes
36	83	84	85	97	98	99	Pd09,10,11, A d03,04,Z d01 Fluxes
37	80	81	82	94	95	96	Pd’09,10,11, A d’03,04,Z d’01 Fluxes
38	77	88	89	90			ESA0, PSA1, PSA2, PSA3 Fluxes
39	78	91	92	93			ESB0, PSB1, PSB2, PSB3 Fluxes
40	79	86	87				AB10, AB12, AB13 Fluxes

Passbands and Geometrical Factors for Voyager 1 LECP Far Encounter and Cruise Channels
Passbands and Geometrical Factors for Voyager 2 LECP Far Encounter and Cruise Channels

Near Encounter STEP Files

INDEX	FAT #	NAME	LOW (MeV/N)	HIGH (MeV/N)	MEAN (MeV/N)	G.F. (cm²sr)
1	1.	EB01	0.015	0.0370	0.020	0.006
2	2.	EBD1	0.015	0.5000	0.020	0.00012
3	3.	EB02	0.037	0.0610	0.045	0.006
4	4.	EBD2	0.037	0.5000	0.045	0.00012
5	5.	EB03	0.070	0.112	0.090	0.006
6	6.	EBD3	0.070	0.5000	0.090	0.00012
7	7.	EB04	0.130	0.1830	0.120	0.006
8	8.	EBD4	0.130	0.5000	0.120	0.00012
9	9.	EB05	0.200	0.5000	0.200	0.006
10	10.	EBD5	0.200	0.5000	0.200	0.00012
11	11.	EG06	0.252	2.0000	0.250	0.00200
12	12.	EG07	0.480	2.0000	0.500	0.00200
13	13.	EG08	0.853	2.0000	0.900	0.00200
14	14.	EG09	2.100	5.0000	2.000	0.00200
15
16
17
18	18.	PL01	0.030	0.0530	0.025	0.04020
19	19.	PL02	0.053	0.0850	0.050	0.04020
20	20.	PL03	0.085	0.1390	0.100	0.04020
21	21.	PL04	0.139	0.2000	0.150	0.04020
22	22.	PL05	0.2000	0.5500	0.2500	0.04020
23	23.	PL06	0.5400	1.0500	0.6	0.04020
24	24.	PL07	1.0500	2.0300	1.0000	0.04020
25	25.	PL08	2.0300	4.0100	2.5000	0.04020
26	44.	AL01	0.9800	1.7700	1.0000	0.04020
27	45.	AL02	1.7700	4.2200	2.5000	0.04020
28	77.	ESA0	2.5000	99.999	2.5000	0.49350
29	78.	ESB0	8.5000	99.999	8.5000	0.94620
30	79.	AB10	8.5000	99.999	8.5000	0.05040
31	80.	DP09	0.2850	5.0200	0.2500	0.00084
32	81.	DP10	0.4800	2.5800	0.6	0.00084
33	82.	DP11	0.7250	1.6400	1.0000	0.00084
34	83.	PD09	0.2850	5.2500	0.2500	0.00260
35	84.	PD10	0.4800	2.7200	0.6	0.00260
36	85.	PD11	0.7250	1.5800	1.0000	0.00260
37	86.	AB12	54.000	87.300	50.000	0.05040
38	87.	AB13	87.300	152.00	100.00	0.05040
39	88.	PSA1	15.800	158.00	15.000	0.49350
40	89.	PSA2	15.800	49.000	25.000	0.49350
41	90.	PSA3	16.300	26.200	25.000	0.49350
42	91.	PSB1	54.000	174.00	50.000	0.94620
43	92.	PSB2	54.000	87.300	50.000	0.94620
44	93.	PSB3	54.000	59.000	50.000	0.94620
45	94.	DA03	0.4800	2.4500	0.6	0.00084
46	95.	DA04	0.7800	1.4100	1.0000	0.00084
47	96.	DZ01	0.4050	18.800	0.6	0.00084
48	97.	AD03	0.4800	2.5800	0.6	0.00260
49	98.	AD04	0.7800	1.4800	1.0000	0.00260
50	99.	ZD01	0.4000	19.800	0.6	0.00260

Grp. #	Col. 1	Col.2	Col. 3	Col.3	Col. 5	Col. 6	NE	FE	CR
1	PL01 Rate	PL02 Rate	PL03 Rate	PL04 Rate	PL05 Rate		X	X	X
2	PL06 Rate	PL07 Rate	PL08 Rate	AL01 Rate	AL02 Rate		X	X	X
3	Eb01 Rate	Eb02 Rate	Eb03 Rate	Eb04 Rate	Eb05 Rate		X	X	X
4	Eb‘01 Rate	Eb‘02 Rate	Eb‘03 Rate	Eb‘04 Rate	Eb‘05 Rate		X	X	X
5	Eg06 Rate	Eg07 Rate	Eg08 Rate	Eg09 Rate			X	X	X
6	A39 Rate	M38 Rate	D1F1 Rate	D1F2 Rate				X	X
7	P32 Rate	A33 Rate	M34 Rate	M35 Rate	H36 Rate			X	X
8	P1 Rate	P10 Rate	P11 Rate	M6 Rate	M7 Rate			X	X
9	A3 Rate	A4 Rate	L5 Rate	H8 Rate	H9 Rate			X	X
10	A12 Rate	A13 Rate	L14 Rate	M15 Rate	H43 Rate			X	X
11	E44 Rate	E45 Rate	E37 Rate	P31 Rate				X	X
12	P16 Rate	P23 Rate	A24 Rate	M25 Rate	H26 Rate			X	X
13	P27 Rate	A28 Rate	M29 Rate	H30 Rate				X	X
14	A17 Rate	L18 Rate	M19 Rate	M20 Rate	H21 Rate	H22 Rate		X	X
15	AR Rate	AL Rate	ALAR Rate	E5 Rate	E4 Rate			X	X
16	E0 Rate	E1 Rate	E2 Rate	E3 Rate				X	X
17	Pd09 Rate	Pd10 Rate	Pd11 Rate	Ad03	Ad04	Zd01	X
18	Pd'09 Rate	Pd'10 Rate	Pd'11 Rate	Ad'03	Ad'04	Zd'01	X
19	ESA0 Rate	PSA1 Rate	PSA2 Rate	PSA3 Rate			X
20	ESB0 Rate	PSB1 Rate	PSB2 Rate	PSB3 Rate			X
21	AB10 Rate	AB12 Rate	AB13 Rate				X
22	PL01 Flux	PL02 Flux	PL03 Flux	PL04 Flux	PL05 Flux		X	X	X
23	PL06 Flux	PL07 Flux	PL08 Flux	AL01 Flux	AL02 Flux		X	X	X
24	Eb01 Flux	Eb02 Flux	Eb03 Flux	Eb04 Flux	Eb05 Flux		X	X	X
25	Eb‘01 Flux	Eb‘02 Flux	Eb‘03 Flux	Eb‘04 Flux	Eb‘05 Flux		X	X	X
26	Eg06 Flux	Eg07 Flux	Eg08 Flux	Eg09 Flux			X	X	X
27	A39 Flux	M38 Flux	D1F1 Flux	D1F2 Flux				X	X
28	P32 Flux	A33 Flux	M34 Flux	M35 Flux	H36 Flux			X	X
29	P1 Flux	P10 Flux	P11 Flux	M6 Flux	M7 Flux			X	X
30	A3 Flux	A4 Flux	L5 Flux	H8 Flux	H9 Flux			X	X
31	A12 Flux	A13 Flux	L14 Flux	M15 Flux	H43 Flux			X	X
32	E44 Flux	E45 Flux	E37 Flux	P31 Flux				X	X
33	P16 Flux	P23 Flux	A24 Flux	M25 Flux	H26 Flux			X	X
34	P27 Flux	A28 Flux	M29 Flux	H30 Flux				X	X
35	A17 Flux	L18 Flux	M19 Flux	M20 Flux	H21 Flux	H22 Flux		X	X
36	Pd09 Flux	Pd10 Flux	Pd11 Flux	Ad03	Ad04	Zd01	X
37	Pd'09 Flux	Pd'10 Flux	Pd'11 Flux	Ad'03	Ad'04	Zd'01	X
38	ESA0 Flux	PSA1 Flux	PSA2 Flux	PSA3 Flux			X
39	ESB0 Flux	PSB1 Flux	PSB2 Flux	PSB3 Flux			X
40	AB10 Flux	AB12 Flux	AB13 Flux				X

Schedule for STEP ASCII file generation:

Voyager 1
Launch through 1979 63 19 41 12	Groups 1-16 and 22-35
1979 63 19 41 36. through 1979 65 8 18 21.9	Groups 1-5, 23-26, 17-21, and 36-40
1979 65 8 18 21.9 through present	Groups 1-16 and 22-35
1990 150 (?) through present
Voyager 2
Launch through 1981 238 1 9 35.4	Groups 1-16 and 22-35
1981 238 1 9 35.4 through 1981 238 7 1 35.4	Groups 1-5, 23-26, 17-21, and 36-40
1981 238 7 1 35.4 through present	Groups 1-16 and 22-35

Description of Voyager LECP CSV Files Type "S" or "STEP"

Record #	Field #	Contents
1.	1	Spacecraft ID VOYAGER:1:PRINTED (example)
	2	ON:
	3	Date & Binary Source 4-SEP-01:16:42:34:V177250S03 (example)
2.	1	YY	Labeling for Start Time of Data Interval
	2	DAY
	3	HH
	4	MM
	5	SS
	6	YY	Labeling for End Time of Data Interval
	7	DAY
	8	HH
	9	MM
	10	SS
	11	SC	Label for Sector Direction of this interval
	12	dd	Label for Scan Direction of this Sector
	13	Label for Data Column #1 Eβ01RATE
	14	Label for Data Column #1 Uncertainty Eβ01UNC
	15	Label for Data Column #2
	16	Label for Data Column #2 Uncertainty
	17	Label for Data Column #3
	18	Label for Data Column #3 Uncertainty
	19	Label for Data Column #4
	20	Label for Data Column #4 Uncertainty
	21	Label for Data Column #5
	22	Label for Data Column #5 Uncertainty
	23	Label for Data Column #6
	24	Label for Data Column #6 Uncertainty
3.	1	Data Start Time Year
	2	Data Start Time Day
	3	Data Start Time Hour
	4	Data Start Time Minute
	5	Data Start Time Second
	6	Data End Time Year
	7	Data End Time Day
	8	Data End Time Hour
	9	Data End Time Minute
	10	Data End Time Second
	11	Sector 1-8, 9 if unknown
	12	Direction +1 for increasing, -1 for decreasing, 0 if unknown
	13	Label for Data Item #1 Eβ01RATE (counts/second, -1 if not present)
	14	Label for Item #1 Uncertainty Eβ01UNC (c./second, -1 if not present)
	15	Label for Data Item #2
	16	Label for Item #2 Uncertainty
	17	Label for Data Item #3
	18	Label for Item #3 Uncertainty
	19	Label for Data Item #4
	20	Label for Item #4 Uncertainty
	21	Label for Data Item #5 (may not be present in some files)
	22	Label for Item #5 Uncertainty (may not be present in some files)
	23	Label for Data Item #6 (may not be present in some files)
	24	Label for Item #6 Uncertainty (may not be present in some files)
4 thru N	Repetitions of Data Records (identical to above field description and labeling)

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Last modified 8/5/05, Tizby Hunt-Ward
tizby@ftecs.com