RPW Data Center
solo_L2_rpw-tds-surv-hist2d
The solo_L2_rpw-tds-surv-hist2d data provide TDS statistics 2D histograms, measured in SURVEY NORMAL and BURST modes. As a part of the on board processing described in the section 2.1, TDS can also build on-board histograms from wave, dust and snapshot parameters calculated by the algorithm. The parameters that can be included in the statistics include peak and RMS amplitude of snapshots and of identified waves, wave frequency, and the amplitude and width of identified dust spikes. It is possible to choose via telecommand up to two pairs of parameters to be used for building of two-dimensional histograms.
DOI: https://doi.org/10.57780/esa-3xcjd4w
| Type of data | 2D histograms |
|---|---|
| Intensity Units | Variable |
| Time resolution | 0.1 sec to 5.4 seconds |
| Data format | CDF (3.9.0) |
| Granularity | 1 file per day |
Data organization
Each CDF record in the file contains one histogram from the TDS on board statistics accumulated over time in seconds indicated in HIST2D_COL_TIME variable. The statistic parameter is stored in HIST2D_PARAM and HIST2D_PARAM_LABEL. The numbers of histogram bins is given by HIST2D_BINS1 and HIST2D_BINS2. Histogram axes are stored in HIST2D_AXIS1 and HIST2D_AXIS2.
The Epoch time (CDF_TIME_TT2000) of each record represents the acquisition time of the first data sample in the accumulation time interval.
Missing or invalid data samples are represented using FILLVAL.
| NAME | TYPE | UNIT | DESCRIPTION |
|---|---|---|---|
| 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. |
| 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. |
| 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 |
| SURVEY_MODE | CDF_UINT1 | unitless Flag to indicate if the receiver in the SURVEY_BURST (=1) or SURVEY_NORMAL (=0) mode. | |
| SAMPLING_RATE | CDF_REAL4 | Hz | TDS sampling rate |
| INPUT_CONFIG | CDF_UINT4 | unitless | TDS input configuration word (a raw value not to be interpreted, use CHANNEL_REF /TDS_LOWGAIN instead) |
| TDS_CONFIG_LABEL | CDF_CHAR | unitless | Text representation of TDS input configuration. Can be: “SE1”, “DIFF1” or “XLD1’’. See Table 1. for interpretation. |
| SNAPSHOT_LEN | CDF_UINT4 | samples | Length of snapshot in samples |
| CHANNEL_REF | CDF_UINT1 | unitless | Configuration of the input signal for the histogram. 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. |
| HIST2D_ID | CDF_UINT1 | unitless | An ID number of the histogram (1 or 2). |
| HIST2D_PARAMS | CDF_UINT1 | unitless | The combination of parameters used to build this histogram. |
| HIST2D_PARAMS_LABEL CDF_CHAR unitless Label for hist2D parameters. | |||
| HIST2D_COL_TIME | CDF_UINT2 | s | The time period over which this histogram has been built. |
| HIST2D_AXIS1 | CDF_REAL4[128] | unitless | The X-axis (first parameter) of the histogram. |
| HIST2D_AXIS2 | CDF_REAL4[128] | unitless | The Y-axis (second parameter) of the histogram |
| HIST2D_BINS1 | CDF_UINT1 | unitless | Number of X bins in the histogram. |
| HIST2D_BINS2 | CDF_UINT1 | unitless | Number of Y bins in the histogram. |
| HIST2D_TOT_SNAPSHOT | CDF_UINT2 | unitless | Total number of snapshots processed when producing the histogram |
| HIST2D_COUNTS | CDF_UINT2[128, 128] | Counts | Counts corresponding to each bin in the histogram |
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.
| ISSUE | MITIGATION(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
Return to Data products description mainpage