SAMPEX MAST 6-Second Rate Data Documentation
This data set consists of 6-second particle rates from the MAST instrument. The data set covers the complete mission, from launch through 2004-182. The rates are not calibrated or converted into physical units. Calibrated particle intensities are also available.
The data are derived from the SAMPEX RS Set data, documented in the SAMPEX NGDF Data File Description.
The time-stamps for the attitude/orbit (PS Set) data have been synced (in ground data processing) with the time-stamps for these 6-second rate data, and with the time-stamps for the particle intensity data.
Thus, the timestamps in each of these data sets may be used to associate the appropriate attitude/orbit data with each 6-second intensity or rates data record.
In addition, the intensity, attitude/orbit, and rates data have been filled so that they all contain the same number of records per day.
The Basic Rates are counts accumulated over 6-second intervals. The multiplexed rates are sampled during 1, 2, or 4 6-second periods every 96 seconds. Thus, their units are also counts/6 seconds, but the data are valid only once (or twice, or 4 times) per 16 data records.
More information on the SAMPEX spacecraft, instruments, operations, and the science data may be found in the SAMPEX Mission and Instrument Documentation.
Description of each data field
- year:
Four-digit year - day:
Day of year (starting at 1) - hr:
Hour of day - min:
Minute of hour - sec:
Second of minute - fp_year:
Year, floating-point - fp_doy:
Day of year, floating-point - sec_of_day:
Second of day - Subcom:
The subcom defines the multiplexed rates for HILT, MAST, and PET. Valid values are 6 thru 21. Thus, each subcom cycle lasts 16×9 = 96 seconds.Basic Rates
- Z1_Sec:
OR of Z1R0, R1, R2 (almost all proton chance coincidences)- ADC_OR:
Trigger of any ADC; protons >~3 MeV, detector noise- Live_Time:
Instrument Livetime, 732 counts/6 seconds = 99.7%- PEN:
Mostly CNO > ~150 MeV/nuc- Z1:
Almost all proton chance coincidences- Z2:
He 8-15 MeV/nuc (5-15 in some periods)- HIZR0:
Z >= 6, 17-19.5 MeV/nuc for O (14.5-19.5 for some periods)- HIZR1:
Z >= 6, 19.5 - 23 MeV/n Oxygen- HIZR2:
Z >= 6, 23 - 31.1 MeV/n Oxygen- HIZR3:
Z >= 6, 31.1 - 51.9 MeV/n Oxygen- HIZR4:
Z >= 6, 51.9 - 76.5 MeV/n Oxygen- HIZR5:
Z >= 6, 76.5 - 113 MeV/n Oxygen- HIZR6:
Z >= 6, 113 - 156 MeV/n OxygenMultiplexed Rates
- M1XSA:
M1 Z2-level discriminator
Subcom=6- M1XSB:
M1 HIZ level discriminator
Subcom=7- M2YSA:
M2 Z2-level discriminator
Subcom=8- M2YSB:
M2 HIZ level discriminator
Subcom=9- M3XSA:
M3 Z2-level discriminator
Subcom=10- M3XSB:
M3 HIZ level discriminator
Subcom=11- M4YSA:
M4 Z2-level discriminator
Subcom=12- M4YSB:
M4 HIZ level discriminator
Subcom=13- D1A:
D1 Z2-level discriminator
Subcom=14- D1B:
D1 HIZ-level discriminator
Subcom=15- D2A:
D2 Z2-level discriminator
Subcom=16- D2B:
D2 HIZ-level discriminator
Subcom=17- D3A:
D3 Z2-level discriminator
Subcom=18- D3B:
D3 HIZ-level discriminator
Subcom=19- D4A:
D4 Z2-level discriminator
Subcom=20- D4B:
D4 HIZ-level discriminator
Subcom=21- M1X1:
M1 position ADC trigger
Subcom=6- M1XS:
M1 ADC trigger
Subcom=7- M2Y1:
M2 position ADC trigger
Subcom=8- M2YS:
M2 ADC trigger
Subcom=9- M3X1:
M3 position ADC trigger
Subcom=10- M3XS:
M3 ADC trigger
Subcom=11- M4Y1:
M4 position ADC trigger
Subcom=12- M4YS:
M4 ADC trigger
Subcom=13- D1:
D1 ADC trigger
Subcom=14- D2:
D2 ADC trigger
Subcom=15- D3:
D3 ADC trigger
Subcom=16- D4:
D4 ADC trigger
Subcom=17- D5:
D5 ADC trigger
Subcom=18- D6:
D6 ADC trigger
Subcom=19- G1:
Low-level anticoincidence guard
Subcom=20- G2:
HIgh-level anticoincidence guard
Subcom=21- D7:
D7 discriminator
Subcom=6- G35L:
LL anticoincidence guard D3 or D5
Subcom=7- G35H:
HL anticoincidence guard D3 or D5
Subcom=8- G47L:
LL anticoincidence guard D4 or D7
Subcom=9- G47H:
HL anticoincidence guard D4 or D7
Subcom=10- G6L:
LL anticoincidence guard D6
Subcom=11- G6H:
HL anticoincidence guard D6
Subcom=12- MAST_HAZ:
ADC trigger close to previous ADC trigger
Subcom=13- D5A:
D5 Z2-level discriminator
Subcom=14- D5B:
D5 HIZ-level discriminator
Subcom=15- D6A:
D6 Z2-level discriminator
Subcom=16- D6B:
D6 HIZ-level discriminator
Subcom=17- M12:
Logical AND of M1 & M2
Subcom=18- M34:
AND of M3 & M4 (=M3 in certain periods)
Subcom=19- L:
OR of Z2-level discriminators
Subcom=20- H:
OR of HIZ-level discriminators
Subcom=21- Z1R0:
Nominal stop in M4 (or M3 in certain periods)
Subcom=6 or 13 or 14 or 21- Z1R1:
Nominal proton stop in D1 (mostly chance coinc.)
Subcom=7 or 15- Z1R2:
Nominal proton stop in D2 (mostly chance coinc.)
Subcom=8 or 16- Z1R3:
Nominal proton stop in D3 (mostly chance coinc.
Subcom=9 or 17- Z1R4:
Nominal proton stop in D4 (mostly chance coinc.)
Subcom=10 or 18- Z1R5:
Nominal proton stop in D5 (mostly chance coinc.)
Subcom=11 or 19- Z1R6:
Nominal proton stop in D6 (mostly chance coinc.)
Subcom=12 or 20- Z2R0:
Probable He stop in M4 (or M3 in certain periods)
Subcom=6 or 13 or 14 or 21- Z2R1:
Probable He stop in D1
Subcom=7 or 15- Z2R2:
Probable He stop in D2
Subcom=8 or 16- Z2R3:
Probable He stop in D3
Subcom=9 or 17- Z2R4:
Nominal He stop in D4 (mostly chance coinc.)
Subcom=10 or 18- Z2R5:
Nominal He stop in D5 (mostly chance coinc.)
Subcom=11 or 19- Z2R6:
Nominal He stop in D6 (mostly chance coinc.)
Subcom=12 or 20Attitude/Orbit
A subset of the SAMPEX attitude/orbit data. For more, see the Complete attitude/orbit data set.- GEO_Long
Longitude in GEO coordinate system (0 to 360 degrees).- GEO_Lat
Longitude in GEO coordinate system (0 to 360 degrees).- L_Shell
L-shell parameter.- Invariant_Lat
Invariant latitude (degrees).- Pitch
Pitch angle of a particle heading down the instrument boresight (i.e., angle between S/C z-axis and (-1) times the local magnetic field vector), in degrees.- Magnetic_Lat
Algebraic magnetic latitude (degrees).- Mag_Local_Tm
Local time at magnetic equator along current field line (hr) ECD.- Att_Flag
Flag, data quality flag indicating source of attitude information (Applies only to pitch angle for the attitude/orbit data subset included here).
Executive summary: flag =0,1,100, or 101 means attitude is OK. Other values indicate attitude is not OK. - Z1_Sec: