# 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 Oxygen#### Multiplexed 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 20#### Attitude/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.