RPW Data Center
solo_L2_rpw-tnr-surv
solo_L2_rpw-tnr-surv data provide electrical (E) and magnetic (B) fields spectra, measured in the survey normal and burst modes over the 4 frequency bands - A, B, C and D - of the TNR receiver of the Solar Orbiter/RPW instrument.
Electrical auto/cross-correlations measured by the two channels 1 and 2 of the receiver are given in V^2/Hz (calibration takes already account of the harness + pre-amplifiers gain/phase contributions).
Magnetic spectral power densities measured by the two channels 1 and 2 of the receiver are fully calibrated in nT/Hz^(1/2), including already the complete system contribution (receiver + harness + pre-amplifiers + magnetic sensors).
Data have been produced following the method described in this paper.
DOI: https://doi.org/10.57780/esa-3xcjd4w
| Type of data | Spectrum |
|---|---|
| Intensity units | V^2/Hz for E-field and nT/Hz^(1/2) for B-field |
| Frequency range | 4 kHz to 1 MHZ |
| Frequency number | 128 (4 x 32) |
| Frequency step | 4.5% * f |
| Frequency scale | Log |
| Time resolution | 1 to 12 seconds |
| Data format | CDF (3.9.0) |
| Granularity | 1 file per day |
Data organization
Table below gives the name, data type, units and description of the zVariables stored in the CDF file.
Each CDF record contains one TNR band spectrum of 32 frequencies.
In the the “TYPE” column, the expected size (i.e., number of elements along each dimension) of the zVariable for a CDF record is given between bracket (e.g., “[1]”).
Non-record-variant zVariables are indicated by a “(NRV)” additional label in the “TYPE” column.
| NAME | TYPE | UNIT | DESCRIPTION |
|---|---|---|---|
| Epoch | CDF_TIME_TT2000 [1] | ns | Epoch time of the record |
| JULIAN_DAY | CDF_REAL8[1] | JD | Julian day corresponding to Epoch |
| NUM | CDF_UINT4 [1] | Index number of the record in the L1 parent file | |
| INTERPOL_FLAG | CDF_UINT1 [1] | Flag to indicate if the current EPOCH value is computed from an interpolated time or actual time as returned in the packet (0=actual, 1=interpolated) | |
| QUALITY_FLAG | CDF_UINT1 [1] | Flag to indicate the quality of the data | |
| QUALITY_BITMASK | CDF_UINT2 [1] | Flag to indicate any context information or status at the receiver or experiment level | |
| SWEEP_NUM | CDF_UINT4 [1] | TNR sweep index number in the current file | |
| MEASUREMENT_DURATION | CDF_DOUBLE [1] | ns | Time duration of the current TNR band measurement in nanoseconds. |
| TICKS_NR | CDF_UINT4 [1] | Number of ticks between two samples for the current TNR band | |
| DELTA_TIME | CDF_DOUBLE [1] | 𝛍s | Delta times of the current TNR band between two data samples in microseconds. Computed from TICKS_NR * (1 tick = 15.258 𝛍s) |
| SURVEY_MODE | CDF_UINT1 [1] | Flag to indicate if the receiver in the SURVEY_BURST (=1) or SURVEY_NORMAL (=0) mode | |
| AVERAGE_NR | CDF_UINT1 [1] | Number of averages applied (16, 32, 64 or 128) | |
| AUTO_CROSS_STATUS | CDF_UINT1 [2] | Flag to indicate if the auto and cross values are computed (=1) or not (=0) for each of the two channels 1 and 2 | |
| CHANNEL_STATUS | CDF_UINT1 [2] | Status of the TNR channels 1 and 2 for the current record. Possible values are: 1=OFF, 0=ON. | |
| FRONT_END | CDF_UINT1 | Indicates the TNR front end setting (GND=0, PREAMP=1, CAL=2) | |
| SENSOR_CONFIG | CDF_UINT1 [2] | Indicates the THR sensor configuration (V1=1, V2=2, V3=3, V1-V2=4, V2-V3=5, V3-V1=6, B_MF=7, HF_V1-V2=9, HF_V2-V3=10, HF_V3-V1=11) for the two TNR channels 1 and 2. | |
| RPW_STATUS | CDF_UINT1 [15] | Status of 15 RPW sub-systems. | |
| TEMPERATURE | CDF_UINT1 [4] | degrees | Temperatures of the 3 HF Pas + 1 analog. in degrees. In the case of an internal calibration mode, it contains the PCB temperature and the 3 Voltages. |
| TNR_BAND | CDF_UINT1 | TNR band of the current record. Possible values are: 1=A, 2=B, 3=C, 4=D | |
| FREQUENCY | CDF_UINT4 [32] | Hz | 32 frequencies of analysis of the current TNR band in Hz |
| INTEGRATION_TIME | CDF_UINT1 [4] (NRV) | ms | Integration time of a single measurement in the four TNR A, B,C and D bands in milliseconds. Total measurement duration T (ms) for a given TNR band is T = INTEGRATION_TIME * AVERAGE_NR, where AVERAGE_NR is the number of averages (i.e., 16, 32, 64 or 128). |
| BANDWIDTH | CDF_FLOAT [4,32] (NRV) | Hz | TNR frequency bandwidth in Hz |
| AUTO1 | CDF_DOUBLE [32] | V2/Hz | Power spectral density at receiver+PA on channel 1 before applying antenna gain, for the 32 frequencies of the current TNR band |
| AUTO2 | CDF_DOUBLE [32] | V2/Hz | Power spectral density at receiver+PA on channel 2 before applying antenna gain, for the 32 frequencies of the current TNR band |
| CROSS_R | CDF_DOUBLE [32] | V2/Hz | Real part of the cross-correlation between channel 1 and channel 2 signals, for the 32 frequencies of the current TNR band |
| CROSS_I | CDF_DOUBLE [32] | V2/Hz | Imaginary part of the cross-correlation between channel 1 and channel 2 signals, for the 32 frequencies of the current TNR band |
| PHASE | CDF_DOUBLE [32] | degrees | TNR Phase in degreesradians, computed from the cross-correlation Im. And Real. Parts [PHASE=atan2(CROSS_I/CROSS_R) * 180/pi]. For the 32 frequencies of the current TNR band |
| MAGNETIC_SPECTRAL_POWER1 | CDF_DOUBLE [32] | nT/Hz1/2 | Magnetic power spectral density from 1 search coil axis in channel 1, for the 32 frequencies of the current TNR band |
| MAGNETIC_SPECTRAL_POWER2 | CDF_DOUBLE [32] | nT/Hz1/2 | Magnetic power spectral density from 1 search coil axis in channel 2, for the 32 frequencies of the current TNR band |
| SYNCHRO_FLAG | CDF_UINT1 [1] | Flag to indicate if the receiver time is synchronised or not with the S/C computer clock. | |
| TNR_BAND_FREQ | CDF_UINT4 [4,32] (NRV) | Hz | Frequencies of analysis of the 4 TNR bands in Hz |
| BAND_LABEL | CDF_CHAR [4] (NRV) | Label for TNR band (A, B, C, D) | |
| CHANNEL_LABEL | CDF_CHAR [2] (NRV) | Label for channel (1, 2) | |
| TEMPERATURE_LABEL | CDF_CHAR [4] (NRV) | Label for 3 PA temperatures + 1 analog | |
| RPW_STATUS_LABEL | CDF_CHAR [15] (NRV) | Label for 15 RPW sub-system status | |
| POST_GAP_FLAG | CDF_UINT1[1] | Flag that indicates data gap in the records. |
Rules of use
Please read the text of the Rules_of_use global attribute in the CDF files.
See also in https://rpw-datacenter.obspm.fr/spip.php?article4.
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) |
|---|---|
| TNR band B data acquisitions are sometime badly timestamped on-board, resulting of incorrect Epoch values for the TNR band B in CDF records. | The Epoch values for the impacted records are replaced in the CDF file by interpolated values. (INTERPOL_FLAG zVariable can be used to identify the records.) |
| RPW MY (3) electrical antenna signal was lost intermittently between November 13th and March 15th. TNR acquisitions were impacted when measurements were performed on this antenna. | Specific entry added for the global attribute CAVEATS and QUALITY_FLAG zVariable set to 1 for impacted records. |
Release notes
See MODS global attribute in the CDF files for an history of the data modifications.
Authors
Antonio Vecchio, Milan Maksimovic, Xavier Bonnin and Quynh Nhu Nguyen
References
• The Solar Orbiter Radio and Plasma Waves (RPW) instrument, Maksimovic et al., A&A, 2020 (https://doi.org/10.1051/0004-6361/201936214)
• THR-Calibration Procedures, A. Vecchio, (REF TO BE ADDED)
• Metadata Definition for Solar Orbiter Science Data, Helen R. Middleton
• RPW Data Product Description Document (DPDD)
• NASA CDF Web portal
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