SEEING Seeing information.

Name

Format

Units

Measure

Comments

Columns

Key

TIME

Double s EPOCH Time interval mid-point

INTERVAL

Double s Time interval

CONFIG_DESCRIPTION_ID

Int Config-description identifier

Data description

NUM_BASE_LENGTH

Int Number of baselengths Nbasept points sampling the function

Data

(BASELENGTH)

Float( Nbasept) m baseline length points

(PHASERMS)

Float( Nbasept) deg RMS Phase Fluctuations

SEEING

Float Seeing parameter, deduced for the LO1 freq.

EXPONENT

Float Exponent of spatial structure function

Notes: This table holds informations on the phase structure and seeing.
TIME
Time midpoint
INTERVAL
Time interval over which the seeing information is extracted
CONFIG_DESCRIPTION_ID
Configuration descriptor identifier providing a direct index to a CONFIG_DESCRIPTION sub-table row number. Note that this configuration description may have been defined specifically to be used in this SEEING sub-table; it may eg refer to the merging of two spectral subarrays. This item allows to know if the seeing originates from the measurements at the astronomical frequency, for the radiometric measurements or from both.
NUM_BASE_LENGTH
Number of baselength bins Nbasept determining the rms fluctuations
BASELENGTH
Actual baselengths on which the rms phase is determined.
PHASERMS
rms phase fluctuations for these baselengths.
SEEING
Seeing parameter, deduced for the LO1 frequency.
EXPONENT
Exponent of power law of the phase structure function

Comment: The phase structure function could be computed on-the-fly when accessing the data in the MAIN and or the TOTAL_POWER_MONITORING table(s). However the intent with this table is to get efficiently the information without reading data!