ROW_BYTES = 172 COLUMNS = 25 OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = LONGITUDE DATA_TYPE = ASCII_REAL POSITIVE_LONGITUDE_DIRECTION = EAST START_BYTE = 1 BYTES = 8 FORMAT = "F8.4" UNIT = DEGREE DESCRIPTION = "East longitude of the target of the detector boresight in body fixed (IAU2000), planetocentric coordinates. Values of latitude, longitude and radius are interpolated from the frame midpoint in the MOLA PEDR and are not as precise as individual altimetry data." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = LATITUDE DATA_TYPE = ASCII_REAL START_BYTE = 9 BYTES = 9 FORMAT = "F9.4" UNIT = DEGREE DESCRIPTION = "North latitude of the target of the detector boresight in body fixed (IAU2000), planetocentric coordinates." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = MARS_RADIUS DATA_TYPE = ASCII_REAL START_BYTE = 18 BYTES = 10 FORMAT = "F10.1" UNIT = METER DESCRIPTION = "The magnitude of the vector from the center of mass of Mars to the detector boresight target point, in meters, averaged at the frame midpoint." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 NAME = EPHEMERIS_TIME DATA_TYPE = ASCII_REAL START_BYTE = 28 BYTES = 13 FORMAT = "F13.2" UNIT = SECOND DESCRIPTION = "Ephemeris Time in seconds past J2000. For a half-frame of 10 shots, this corresponds to the end of noise counting for shot 5, and the start of noise counting for shot 6. The target position of the detector boresight is calculated at this time." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 5 NAME = NORMALIZED_POWER_1 DATA_TYPE = ASCII_REAL START_BYTE = 41 BYTES = 7 FORMAT = "F7.3" DESCRIPTION = "Spectral radiance of surface in the detector field of view at 1064 nm wavelength from MOLA channel 1, averaged over the 1 s half-frame. Power has been normalized to a constant Mars mean solar distance. The solar irradiance at 1 AU at 1064 nm is 647 mW per meter squared per nm, or 279 mW per meter squared per nm at Mars. Spectral SOLAR_RADIANCE from a perfectly Lambertian scattering surface is nominally 279 times the cosine of the SOLAR_ZENITH_ANGLE divided by pi steradians, or ~89 mW/(m^2 sr nm), although at high solar incidence the contribution of scattered light may be substantial. The radiance factor I/F commonly used in astronomy is given by: I/F = NORMALIZED_POWER/SOLAR_RADIANCE. This ratio may range from 0 to greater than 1, depending on surface albedo and phase angle. The MOLA measurements of I/F often exceed unity, owing to an undetermined calibration scale factor. An empirical factor of 0.7 applied to NORMALIZED_POWER produces values of I/F similar to those observed by the Hubble Space Telescope and other terrestrial instruments. Units are milliwatts per meter squared per steradian per nanometer." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 6 NAME = NORMALIZED_POWER_2 DATA_TYPE = ASCII_REAL START_BYTE = 48 BYTES = 7 FORMAT = "F7.3" DESCRIPTION = "Spectral radiance from MOLA channel 2, averaged over the 1 s half-frame, as described above. Units are milliwatts per meter squared per steradian per nanometer." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 7 NAME = RECEIVER_THRESHOLD_1 DATA_TYPE = ASCII_INTEGER START_BYTE = 55 BYTES = 4 FORMAT = "I4" DESCRIPTION = "An instrument parameter that sets the trigger threshold for photon detection on channel 1." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 8 NAME = RECEIVER_THRESHOLD_2 DATA_TYPE = ASCII_INTEGER START_BYTE = 59 BYTES = 4 FORMAT = "I4" DESCRIPTION = "An instrument parameter that sets the trigger threshold for photon detection on channel 2." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 9 NAME = RECEIVER_THRESHOLD_3 DATA_TYPE = ASCII_INTEGER START_BYTE = 63 BYTES = 4 FORMAT = "I4" DESCRIPTION = "An instrument parameter that sets the trigger threshold for photon detection on channel 3." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 10 NAME = RECEIVER_THRESHOLD_4 DATA_TYPE = ASCII_INTEGER START_BYTE = 67 BYTES = 4 FORMAT = "I4" DESCRIPTION = "An instrument parameter that sets the trigger threshold for photon detection on channel 4." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 11 NAME = MARS_RANGE DATA_TYPE = ASCII_REAL START_BYTE = 71 BYTES = 8 FORMAT = "F8.0" UNIT = METER DESCRIPTION = "The magnitude of the vector from the MOLA instrument to the target point, averaged from the valid MOLA ground returns in the 1-second half frame." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 12 NAME = EMISSION_ANGLE DATA_TYPE = ASCII_REAL START_BYTE = 79 BYTES = 8 FORMAT = "F8.3" UNIT = DEGREE DESCRIPTION = "The angle between the vector from Mars center of mass to the target point, and the vector from the target point to MOLA. This angle varies slowly and thus is computed once at the midpoint of each 2-second data frame, likewise values in columns 13-18." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 13 NAME = OFF_NADIR_ANGLE DATA_TYPE = ASCII_REAL START_BYTE = 87 BYTES = 8 FORMAT = "F8.3" UNIT = DEGREE DESCRIPTION = "The angle between the vector from MOLA to the target point and the vector from MOLA to Mars center of mass. Also known as LOOK_ANGLE." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 14 NAME = LOCAL_TIME DATA_TYPE = ASCII_REAL START_BYTE = 95 BYTES = 8 FORMAT = "F8.4" DESCRIPTION = "The local true solar time in hours of 24 in a Martian Sol at the target point, as a decimal number." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 15 NAME = SOLAR_PHASE_ANGLE DATA_TYPE = ASCII_REAL START_BYTE = 103 BYTES = 8 FORMAT = "F8.3" UNIT = DEGREE DESCRIPTION = "The solar phase angle between a vector from the target point to the Sun, and a vector from the target point to MOLA." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 16 NAME = SOLAR_ZENITH_ANGLE DATA_TYPE = ASCII_REAL START_BYTE = 111 BYTES = 8 FORMAT = "F8.3" UNIT = DEGREE DESCRIPTION = "The solar zenith angle between a vector from the target point to the Sun, and a vector from Mars center of mass to the target point. Also known as SOLAR_INCIDENCE_ANGLE." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 17 NAME = SOLAR_LONGITUDE DATA_TYPE = ASCII_REAL START_BYTE = 119 BYTES = 9 FORMAT = "F9.4" UNIT = DEGREE DESCRIPTION = "The solar longitude at Mars, a seasonal variable that is usually abbreviated L sub s." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 18 NAME = ANOMALY_FLAG DATA_TYPE = ASCII_INTEGER START_BYTE = 128 BYTES = 2 FORMAT = "I2" DESCRIPTION = "A flag that is set to 0 for an error-free packet. If spacecraft attitude data was absent for some (2) or all (3) of the 2-second data frame, the MGS Spacecraft pointing is assumed nadir and the observation angles are approximated accordingly. If there were no ground returns in the data frame, this flag is increased by 4." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 19 NAME = NOISE_COUNTS_1 DATA_TYPE = ASCII_INTEGER START_BYTE = 130 BYTES = 7 FORMAT = "I7" DESCRIPTION = "The number of noise counts received on channel 1, sum of ten values taken at the RECEIVER_THRESHOLD_1 during the ten measurements that make up a 1 second half-frame. These have been stored in the packet as a 5-bit binary logarithm with 3-bit mantissa. Due to downward rounding these values may be as much as 12% lower than the actual noise counts during a 1 second half-frame." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 20 NAME = NOISE_COUNTS_2 DATA_TYPE = ASCII_INTEGER START_BYTE = 137 BYTES = 7 FORMAT = "I7" DESCRIPTION = "The decimal number of noise counts received on channel 2, sum of ten values taken at the RECEIVER_THRESHOLD_2 during the ten measurements that make up a 1 second half-frame. These have been stored in the packet as described above." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 21 NAME = NOISE_COUNTS_3 DATA_TYPE = ASCII_INTEGER START_BYTE = 144 BYTES = 7 FORMAT = "I7" DESCRIPTION = "The decimal number of noise counts received on channel 3, sum of ten values taken at the RECEIVER_THRESHOLD_3 during the ten measurements that make up a 1 second half-frame. These have been stored in the packet as described above." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 22 NAME = NOISE_COUNTS_4 DATA_TYPE = ASCII_INTEGER START_BYTE = 151 BYTES = 7 FORMAT = "I7" DESCRIPTION = "The decimal number of noise counts received on channel 4, sum of ten values taken at the RECEIVER_THRESHOLD_4 during the ten measurements that make up a 1 second half-frame. These have been stored in the packet as described above." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 23 NAME = SEQUENCE_COUNT DATA_TYPE = ASCII_INTEGER START_BYTE = 154 BYTES = 6 FORMAT = "I6" MINIMUM = 0 MAXIMUM = 16383 DESCRIPTION = "This field contains a sequential count (modulo 16385) of each packet generated by the MOLA flight software. This counter is initialized at 0 at instrument restart, and increments by 1 on succeeding packets. When the counter reaches 16384, it is recorded as 0, as is the following packet. Each packet contains 14 half-frames of 10 shots. The spacecraft clock is not recorded in the first packet following instrument restart, so SEQUENCE_COUNT may be used to determine the timing of packets following instrument reset." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 24 NAME = ORBIT_NUMBER DATA_TYPE = ASCII_INTEGER START_BYTE = 160 BYTES = 6 FORMAT = "I6" DESCRIPTION = "The mapping mission orbit number determined by the Mars Global Surveyor Flight Operations system, plus 10000. Orbits increment at each spacecraft descending equator crossing. Numbers below 10000 were reserved for the Aerobraking Mission Phase, during which periapse passes numbered from 1 to 1682 were used as orbit number." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 25 NAME = DETECTOR_TEMPERATURE DATA_TYPE = ASCII_REAL START_BYTE = 166 BYTES = 5 FORMAT = "F5.2" UNIT = DEGREES DESCRIPTION = "Temperature of the MOLA detector in degrees Centigrade obtained from a thermal model of the detector subassembly and temperature readings of the detector interface plate. This temperature is used to correct for the temperature response of the detector photodiode." END_OBJECT = COLUMN