TGO NOMAD Calibrated Data

Instrument: NOMAD

PDS4 Collection: urn:esa:psa:em16_tgo_nmd:data_calibrated

PDS4 Bundle: urn:esa:psa:em16_tgo_nmd

NOMAD PDS4 Calibrated data are generated from two ways. One way is to create the calibrated data by a pipeline which is split between channel (SO/LNO and UVIS) and observation type (nadir and solar occultation). The other way is to derive the calibrated data directly from the calibration observations that do not pass through either pipeline. See more information in section 5.4 of NOMAD Experiment to Archive Interface Control Document.

Calibrated data have a different naming convention, with more detail concerning the observation type and spectral range where appropriate:

For solar occultation observations with SO or LNO:

nmd_cal_sc_<channel>_<YYYYMMDD1>T<hhmmss1>-<YYYYMMDD2>T<hhmmss2>-<altitude_type>-<obs_type>-<diffraction_order>.

For nadir observations with LNO:

nmd_cal_sc_lno_<YYYYMMDD1>T<hhmmss1>-<YYYYMMDD2>T<hhmmss2>-<obs_number>-<obs_type>-<diffraction_order>.

For UVIS observations:

nmd_cal_sc_uvis_<YYYYMMDD1>T<hhmmss1>-<YYYYMMDD2>T<hhmmss2>-<obs_type>.

Where:

<channel>

so = SO channel science data

lno = LNO data

uvis = UVIS data

<YYYYMMDD1>T<hhmmss1> is the observation start time in years, months, days, hours, minutes and seconds respectively.

<YYYYMMDD2>T<hhmmss2> is the observation end time in years, months, days, hours, minutes and seconds respectively.

<altitude_type> denotes whether the given diffraction order was measured continuously throughout the occultation, or if it was switched at 50km (see section 3.3.7.1 of NOMAD Experiment to Archive Interface Control Document). The three options are:

H=measured only at high altitudes

L=measured only at low altitudes

A=measured at all altitudes, which is by far the most common.

<obs_number> is a special flag for LNO, as it is theoretically possible that each nadir observation can be split into two

halves, with a different set of diffraction orders used for each half.

1 = diffraction orders measured during the entire or first half of the nadir

2 = those measured during the second half of the nadir observation.

note: At the time of writing this splitting has never been used, so only values of 1 will be present in the archive.

<obs_type> is the observation type, see more details in section 2.8 of NOMAD Experiment to Archive Interface Control Document.

I=occultation ingress (during solar occultation)

E=occultation egress (during solar occultation)

G = Grazing occultation (during solar occultation)

S = Fullscan (during a solar occultation observation)

F = Fullscan (during a nadir observation)

D = Day nadir.

N = Night nadir

L = Dayside limb observation

O = Nightside limb observation

C = Calibration

<diffraction_order> is the observed SO/LNO diffraction order, in the range 90-225, if appropriate.