About the verification of the RPW data quality.


RPW QUALITY_BITMASK CDF VARIABLE

Definition

The formal definition of the QUALITY_BITMASK CDF zVariable is provided in the "Metadata Definition for Solar Orbiter Science Data" document (SOL-SGS-TN-0009). There is one value per CDF record.

For RPW L1 CDF

WARNING: QUALITY_BITMASK SETTING IS NOT FULLY IMPLEMENTED IN L1 CDF

The QUALITY_BITMASK CDF_UINT2 zVariable in the RPW L1 CDFs is set by the RPW operations and data pipeline (RODP) hosted at LESIA.

Table below gives the list of possible values for L1 CDFs. It assumes that these values are common to all RPW L1 CDF products.

Bit Decimal  valueMeaningJustificationComputationComment
1
BIAS1_SWEEP - ongoing sweepOngoing sweep on ANT1 probeShould be set from 100 ms before the sweep to 1 s after the sweep on a particular probe.
2
BIAS2_SWEEP - ongoing sweepOngoing sweep on ANT2 probe

3
BIAS3_SWEEP - ongoing sweepOngoing sweep on ANT3 probe

4
EMC QUIET windowSolO payload is in EMC QUIET modeKnown from EMC_MAND_QUIET E-FECS event 
5
EMC NOISY windowSolO payload is in EMC NOISY modeKnown from EMC_PREF_NOISY E-FECS event
6
Spacecraft roll manœuvreIndicate when the spacecraft perform rollsKnown from *_ROLL E-FECS event
7
Thruster firingsIndicate when the plateform thruster firings happen Known from TMC+WOL E-FECS event


RPW +Z ANT PA in the line of sight of the HGA during TX ON.The HGA TX may have an impact on the RPW science measurement quality when the ANT PA in the HGA light of sight To be determinated by ROC from SPICE computationNot implemented


SPICE Heat Shield Door is openSPICE HSD may have an impact on the RPW +Z ANT bending effectKnown from HSD_SPICE_OPEN E-FECS eventNot implemented


LFR setting has changed before the end of the current data samples acquisitionAccording to LFR data acquisition mechanism and CDF structure, it can be impossible for some dataset (i.e., SWF) to take of a LFR setting change - performed via a command execution on-board - in a CDF record time window. Users need nevertheless to be warned when such LFR setting change occurred during a data sample acquisition. Known from the reception of the TM_LFR_TC_EXE_SUCCESS {YIW00139} S1 TM that confirms the LFR setting change Not implemented


Possible SWA-PAS high voltage contaminationSWA-PAS unit may provoke noise on RPW measurementsInclusion of this event into the bitmask is TBC (quantification of the impact is TBD)Not implemented


BIAS1_CURRENT_NONCONSTANTChanges in biasing current may (1) not be instantaneous, and (2) may have uncertain timestamps.Should be set from 100 ms before to 1 s after any change in bias current on a particular probe (including sweeps).Not implemented


BIAS2_CURRENT_NONCONSTANT




BIAS3_CURRENT_NONCONSTANT




















For RPW L2 CDF

The zVariable QUALITY_BITMASK is set in the L1 CDF by the RPW data pipeline at LESIA and must not be changed by the RPW Calibration Software (RCS) when producing the L2 CDF. QUALITY_BITMASK bits allocated in L1 CDF must be saved "as is" in L2 CDF. To store information specific to L2 data, please use the dedicated L2_QUALITY_BITMASK CDF_UINT2 zVariable instead.

The optional CDF_UINT2 zVariable L2_QUALITY_BITMASK can be used instead in the RPW L2 CDF, in order to provide information related to the equipment. The name of this zVariable must be the same in all the L2 CDF, but the bit meaning can different.

Table below gives the list of values to be set in L2 CDF by RCS.

INSTRUCTION: Table to be filled with extra information to be passed by RCS in the L2 CDF QUALITY_BITMASK zVar using free bits. "Bit" and "Decimal value" columns should be let free for the moment. "Comment" column can be used to specify the L2 CDF product(s) for which the QUALITY_BITMASK zVar must be set (if it is not specified, it is assumed that all L2 CDF products requires this information).

Bit Decimal  valueMeaningJustificationComputationComment
0
SCM outworking or unknown temperatureIndicate when the SCM temperature are out of working rangeknown from HK_LFR_TEMP_SCM T< -55°C or T> +85°C

Values defined by SCMCAL in the L2 magnetical data (-B) CDFs only
1
SCM heater on/off transitionindicate EMC transient:
- SCM heater on/off
 
- Known from HK_PDU_HEATER_CURRENT

Values defined by SCMCAL in the L2 magnetical data (-B) CDFs only
2
LFR onboard calibration signalIndicate when the LFR send calibration signal to SCMknown from HK_LFR_CALIB_ENABLEDValues defined by SCMCAL in the L2 magnetical data (-B) CDFs only

RPW QUALITY_FLAG CDF VARIABLE

Definition

The formal definition of the QUALITY_FLAG CDF zVariable is provided in the "Metadata Definition for Solar Orbiter Science Data" document (SOL-SGS-TN-0009). There is one value per CDF record.

The possible values of the QUALITY_FLAG CDF zVariable are reported in the following table for convenience.

QualityMeaning
0

Bad data

1

Known problems, use at your own risk

2

Survey data, possibly not publication-quality

3

Good for publication, subject to PI approval

4

Excellent data which has received special treatment

Implementation plan

The QUALITY_FLAG values of the RPW L1 CDF are all set to "3" by default.

From this initial status, the RCS must then decide in an autonomous way to change or not the value of QUALITY_FLAG records, when transferring the quality information to the output RPW CDF. The RCS decision must rely on relevant data (i.e, QUALITY_BITMASK, other data, parent data, etc.) as explained in the next section.

Computation

The detailed computation of the QUALITY_FLAG for each RPW L1R/L2 data product must be given in the RCS Software Requirements Specification (SRS) documents (see RPW Calibration Software Documentation).

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