Summed Gamma Spectra

The SGS data set is a collection of data tables that contain a gamma spectrum and the associated engineering data that has been summed over 5-degree by 5-degree latitude-longitude cells on the surface of Mars and over a time period of 15-degrees of solar longitude (Ls). The SGS are produced because the individual gamma spectra collected during an approximately 19.7 second collection interval do not contian enough counts to be statistically significant. The SGS are summed over large enough and long enough spatial and temporal intervals to provide a statistically meaningful spectrum that can be used for scientific data analysis.

Detailed Information

Column Descriptions
Column Name Type Bytes Units
AREOCENTRIC_LATITUDE IEEE_REAL 4
Centerpoint areocentric latitude.
AREOCENTRIC_EAST_LONGITUDE IEEE_REAL 4
Centerpoint areocentric east longitude.
UTC_START_TIME CHARACTER 23
UTC time of first spectrum in sum.
UTC_STOP_TIME CHARACTER 23
UTC time of last spectrum in sum.
SC_START_TIME IEEE_REAL 8
Time of first spectrum in sum, in units of spacecraft clock ticks (256 per second).
SC_STOP_TIME IEEE_REAL 8
Time of last spectrum in sum, in units of spacecraft clock ticks (256 per second).
CLOCK_TIME IEEE_REAL 8 MILLISECOND
Sum of pixel durations.
RECORD_COUNT IEEE_REAL 8
Count of spectra being summed.
BAD_CODE MSB_UNSIGNED_INTEGER 4
Non-zero if any spectra had bad_code set.
LLD_SUM IEEE_REAL 8
Lower level discriminator count sum.
ULD_SUM IEEE_REAL 8
Upper level discriminator count sum.
L1_SUM IEEE_REAL 8
Sum of counts within the L1 energy range.
L2_SUM IEEE_REAL 8
Sum of counts within the L2 energy range.
L3_SUM IEEE_REAL 8
Sum of counts within the L3 energy range.
PHA_SUM IEEE_REAL 8
Sum of Pulse Height Analyzer counter.
HVBS_MONITOR_MIN IEEE_REAL 4 VOLT
Minimum value of High Voltage Bias Supply Monitor voltage.
HVBS_MONITOR_MAX IEEE_REAL 4 VOLT
Maximum value of High Voltage Bias Supply Monitor.
HVBS_MONITOR_MEAN IEEE_REAL 4 VOLT
Mean value of High Voltage Bias Supply Monitor.
HVBS_MONITOR_STD IEEE_REAL 4 VOLT
Standard Deviation of High Voltage Bias Supply Monitor.
IS_TEMP_A_MIN IEEE_REAL 4 CELSIUS
Minimum value of Inner Stage temperature A.
IS_TEMP_A_MAX IEEE_REAL 4 CELSIUS
Maximum value of Inner Stage temperature A.
IS_TEMP_A_MEAN IEEE_REAL 4 CELSIUS
Mean value of Inner Stage temperature A.
IS_TEMP_A_STD IEEE_REAL 4 CELSIUS
Standard Deviation of Inner Stage temperature A.
IS_TEMP_B_MIN IEEE_REAL 4 CELSIUS
Minimum value of Inner Stage temperature B.
IS_TEMP_B_MAX IEEE_REAL 4 CELSIUS
Maximum value of Inner Stage temperature B.
IS_TEMP_B_MEAN IEEE_REAL 4 CELSIUS
Mean value of Inner Stage temperature B.
IS_TEMP_B_STD IEEE_REAL 4 CELSIUS
Standard Deviation of Inner Stage temperature B.
OS_TEMP_A_MIN IEEE_REAL 4 CELSIUS
Minimum value of Outer Stage temperature A.
OS_TEMP_A_MAX IEEE_REAL 4 CELSIUS
Maximum value of Outer Stage temperature A.
OS_TEMP_A_MEAN IEEE_REAL 4 CELSIUS
Mean value of Outer Stage temperature A.
OS_TEMP_A_STD IEEE_REAL 4 CELSIUS
Standard Deviation of Outer Stage temperature A.
OS_TEMP_B_MIN IEEE_REAL 4 CELSIUS
Minimum value of Outer Stage temperature B.
OS_TEMP_B_MAX IEEE_REAL 4 CELSIUS
Maximum value of Outer Stage temperature B.
OS_TEMP_B_MEAN IEEE_REAL 4 CELSIUS
Mean value of Outer Stage temperature B.
OS_TEMP_B_STD IEEE_REAL 4 CELSIUS
Standard Deviation of Outer Stage temperature B.
B170K_TEMP_MIN IEEE_REAL 4 CELSIUS
Minimum value of 170K card temperature.
B170K_TEMP_MAX IEEE_REAL 4 CELSIUS
Maximum value of 170K card temperature.
B170K_TEMP_MEAN IEEE_REAL 4 CELSIUS
Mean value of 170K card temperature.
B170K_TEMP_STD IEEE_REAL 4 CELSIUS
Standard Deviation of 170K card temperature.
GPA_TEMP_MIN IEEE_REAL 4 CELSIUS
Minimum value of Gamma Pulser Analyzer temperature.
GPA_TEMP_MAX IEEE_REAL 4 CELSIUS
Maximum value of Gamma Pulser Analyzer temperature.
GPA_TEMP_MEAN IEEE_REAL 4 CELSIUS
Mean value of Gamma Pulser Analyzer temperature.
GPA_TEMP_STD IEEE_REAL 4 CELSIUS
Standard Deviation of Gamma Pulser Analyzer temperature.
GAMMA_VREF_TEMP_MIN IEEE_REAL 4 CELSIUS
Minimum value of Gamma V Reference temperature.
GAMMA_VREF_TEMP_MAX IEEE_REAL 4 CELSIUS
Maximum value of Gamma V Reference temperature.
GAMMA_VREF_TEMP_MEAN IEEE_REAL 4 CELSIUS
Mean value of Gamma V Reference temperature.
GAMMA_VREF_TEMP_STD IEEE_REAL 4 CELSIUS
Standard Deviation of Gamma V Reference temperature.
APPS_GAIN_DHK_DEFAULT MSB_UNSIGNED_INTEGER 2
Default value of APPS gain.
APPS_GAIN_DHK_MIN MSB_UNSIGNED_INTEGER 2
Minimum value of APPS gain.
APPS_GAIN_DHK_MAX MSB_UNSIGNED_INTEGER 2
Maximum value of APPS gain.
GAIN_MEAN IEEE_REAL 4
Mean value of gain corrections.
OFFSET_MEAN IEEE_REAL 4
Mean value of offset corrections.
FIRST_CHANNEL_MAX MSB_UNSIGNED_INTEGER 2
Maximum first valid channel in the spectrum.
LAST_CHANNEL_MIN MSB_UNSIGNED_INTEGER 2
Minimum last valid channel in the spectrum.
GAMMA_SPECTRUM IEEE_REAL 131072
Corrected gamma spectrum, float value for each channel.