Collection Information
IDENTIFIER urn:nasa:pds:mess-mag-raw:data-lac::1.0
NAME MESSENGER MAG Alternating Current Data Collection
TYPE Data
DESCRIPTION Contains alternating current (AC) level values at the commanded sample rate. To conserve telemetry the vector sampling will usually be less than the maximum rate, 20 sample/s. To provide a record of the amplitude of fluctuations for frequencies higher than 1 Hz, an AC amplitude is calculated from the internally sampled 20/s data for the sensor axis commanded as the AC_AXIS. Thus, in addition to the vector samples data, a 1 Hz to 10 Hz bandpass average amplitude is evaluated for the commanded sensor axis, selected by command, and recorded as a log AC value with a 4-bit mantissa of the four most significant non-zero bits and a 4-bit power of two exponent of the 4th (least significant) bit of the mantissa. This is called the logAC value. It is created once per second and saved for telemetry at that rate or at the commanded science rate, whichever is less frequent.
SEARCH/ACCESS DATA MESSENGER MAG Alternating Current Data Collection Online
   
Citation
DIGITAL OBJECT IDENTIFIER (DOI) 10.17189/1522364
AUTHOR LIST Korth, H.
EDITOR LIST
PUBLICATION YEAR 2021
DESCRIPTION Contains alternating current (AC) level values at the commanded sample rate. To conserve telemetry the vector sampling will usually be less than the maximum rate, 20 sample/s. To provide a record of the amplitude of fluctuations for frequencies higher than 1 Hz, an AC amplitude is calculated from the internally sampled 20/s data for the sensor axis commanded as the AC_AXIS. Thus, in addition to the vector samples data, a 1 Hz to 10 Hz bandpass average amplitude is evaluated for the commanded sensor axis, selected by command, and recorded as a log AC value with a 4-bit mantissa of the four most significant non-zero bits and a 4-bit power of two exponent of the 4th (least significant) bit of the mantissa. This is called the logAC value. It is created once per second and saved for telemetry at that rate or at the commanded science rate, whichever is less frequent.
   
Context
START DATE TIME 2004-08-12T05:44:07.000Z
STOP DATE TIME 2015-04-30T03:08:04.000Z
LOCAL MEAN SOLAR TIME
LOCAL TRUE SOLAR TIME
SOLAR LONGITUDE
PRIMARY RESULT PURPOSE ENGINEERING
PRIMARY RESULT PROCESSING LEVEL Raw
PRIMARY RESULT DESCRIPTION
PRIMARY RESULT WAVELENGTH RANGE
PRIMARY RESULT DOMAIN
PRIMARY RESULT DISCIPLINE NAME
INVESTIGATION MESSENGER
OBSERVING SYSTEM
OBSERVING SYSTEM COMPONENT MESSENGER
Magnetometer
TARGET CALIBRATION
EARTH
VENUS
MERCURY
REFERENCES