The solo_L2_rpw-tds-sbm2-tswf-e data provides TDS regular waveform snapshots with up to three electric components, measured in the SBM1 mode. This data product has an identical structure as solo_L2_rpw-tds-surv-tswf-e.

DOI: https://doi.org/10.57780/esa-3xcjd4w

Data product key facts
Type of data Time series
Units V/m and V
Time resolution variable
Data format CDF (3.9.0)
Granularity 1 file per day

Data organization

Each CDF record in the file contains a waveform snapshot (time series) for up to three channels of the electric field, as indicated in CHANNEL_ON. The same waveform data are represented in multiple forms in the file:
The internal data organization is the same as for solo_L2_rpw-tds-surv-tswf-e.

NAMETYPEUNITDESCRIPTION
Epoch CDF_TIME_TT2000 ns Primary time used as a reference in the file. Corresponds to the time of the first sample of the snapshot.
EPOCH_OFFSET CDF_INT8[65536] ns Time offset in nanoseconds for each data sample in the snapshot from the Epoch time.
CALIBRATION_TABLE_INDEX CDF_UINT1[2] unitless Index of SWF calibration table
QUALITY_FLAG CDF_UINT1 unitless Flag to indicate the quality of the data. 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.
QUALITY_BITMASK CDF_UINT2 unitless Flag to indicate any context information or status at the receiver or experiment level. Forwarded from L1 data.
L2_QUALITY_BITMASK CDF_UINT2 unitless Flag to indicate any context information or status at the receiver or experiment level.
SURVEY_MODE CDF_UINT1 unitless Flag to indicate if the receiver in the SURVEY_BURST (=1) or SURVEY_NORMAL (=0) mode.
BIAS_ON CDF_UINT1 unitless Non-zero if BIAS powered on.
BIAS1_ON CDF_UINT1 unitless Non-zero if biasing active on ANT1.
BIAS2_ON CDF_UINT1 unitless Non-zero if biasing active on ANT2.
BIAS3_ON CDF_UINT1 unitless Non-zero if biasing active on ANT3.
BIAS_HV_ON CDF_UINT1 unitless Non-zero if BIAS High Voltage active.
BIAS_MUX_MODE CDF_UINT1 unitless BIAS MUX setting
RPW_THR_ON CDF_UINT1 unitless Non-zero value indicates THR was powered on.
RPW_LFR_ON CDF_UINT1 unitless Non-zero value indicates LFR was powered on.
RPW_ANT1_ON CDF_UINT1 unitless Non-zero value indicates preamplifier on antenna 1 was powered on.
RPW_ANT2_ON CDF_UINT1 unitless Non-zero value indicates preamplifier on antenna 2 was powered on.
RPW_ANT3_ON CDF_UINT1 unitless Non-zero value indicates preamplifier on antenna 3 was powered on.
RPW_SCM_ON CDF_UINT1 unitless Non-zero value indicates SCM sensor was powered on.
RPW_SCM_CALIB CDF_UINT1 unitless Non-zero if SCM calibration signal is active.
SAMPLING_RATE CDF_REAL4 Hz Sampling rate of the snapshot in Hz (262 or 524 kHz).
DOWNLINK_REASON CDF_UINT1 unitless Selection code of the down-linked packet, 1=WAVE, 2=DUST, 5=OTHERS
DOWNLINK_ALGO_CODE CDF_UINT1 unitless Onboard selection algorithm code
CHANNEL_OVERFLOW CDF_UINT1[4] unitless Channel overflow data. One byte per channel. If set to 1, the channel was saturated by out-of-range input during the snapshot.
BUFFER_OVERFLOW CDF_UINT1 unitless Normally zero. Non-zero value indicates TDS internal buffer overflow and possibly bad data.
FILTER_COEFS CDF_UINT1 unitless Index of the FIR digital filter used by TDS (1 to 3).
INPUT_CONFIG CDF_UINT4 unitless TDS input configuration word (a raw value not to be interpreted, use CHANNEL_REF /TDS_LOWGAIN instead)
TDS_LOWGAIN CDF_UINT1[4] unitless One value per channel. For each channel indicates f the receiver is in the LOWGAIN (=1) or HIGHGAIN (=0) mode
TDS_CONFIG_LABEL CDF_CHAR unitless Text representation of TDS input configuration. Can be: “SE1”, “DIFF1” or “XLD1’’. See Table 1. for interpretation.
SNAPSHOT_SEQ_NR CDF_UINT2 unitless Sequential number of a snapshot incremented with every snapshot
CHANNEL_REF CDF_UINT1[4] unitless Configuration of signal channels in the snapshot. Each element is a decadic number AB, where the digits A and B indicate a combination of RPW antennas in this channel (0=GND 1=V1, 2=V2, 3=V3). The number AB indicates that the corresponding channel contains a difference of 2 channels A-B. For example, value of 31 indicates dipole V3-V1.
CHANNEL CDF_UINT1[4] (NRV) unitless Metadata referring to a channel axis.
CHANNEL_LABEL CDF_CHAR[4] (NRV) N/A Labels for the channel axis.
SAMPS_PER_CH CDF_UINT4 unitless Number of samples per channel
CHANNEL_ON CDF_UINT1[4] unitless If element X of the channel is non-zero, the corresponding channel X contains valid data.
WAVEFORM_DATA CDF_REAL4[3, 65536] V/m Calibrated electric field waveform snapshots in antenna coordinates. Each component corresponds to one TDS channel.
WAVEFORM_DATA_VOLTAGE CDF_REAL4[3, 65536] V The TDS waveform calibrated to voltage using a constant factor calibration.
E_FIELD_Y_SRF CDF_REAL4[65536] V/m Y component of calibrated E-field in SRF coordinates.
E_FIELD_Z_SRF CDF_REAL4[65536] V/m Z component of calibrated E-field in SRF coordinates.
RPW_ANTENNA_RTN CDF_INT8[3, 3] unitless Matrix of vectors representing three effective directions and lengths of RPW antennas in RTN coordinates.
RPW_ANTENNA_RTN_LABEL_1 CDF_CHAR[4] (NRV) N/A Labels for a vector axis.
RPW_ANTENNA_RTN_LABEL_2 CDF_CHAR[4] (NRV) N/A Labels for a component axis.

Caveats and known issues

Table below gives the list of main known issues and the actions taken to mitigate them.
Please read the CAVEATS global attribute entries in the CDF files to be aware of the possible issues and limitations concerning data.

ISSUEMITIGATION(S)
RPW MY (3) electrical antenna signal was lost intermittently between November 2023 and February 28, 2024. TDS acquisitions were impacted when measurements were performed on this antenna. TDS receiver was switched into the monopole mode (SE1) configuration.

Release notes

See MODS global attribute in the CDF files for an history of the data modifications.

Authors

David Pisa, and Jan Soucek.

References

• The Solar Orbiter Radio and Plasma Waves (RPW) instrument, Maksimovic et al., A&A, 2020 (https://doi.org/10.1051/0004-6361/201936214)
• Metadata Definition for Solar Orbiter Science Data, Helen R. Middleton
• RPW Data Product Description Document (DPDD)
• NASA CDF Web portal

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