RPW Data Center
solo_L2_rpw-hfr-surv
solo_L2_rpw-hfr-surv data provide E-field spectrum, measured in survey normal and burst modes over the 2 frequency bands – HF1 and HF2 - of the HFR receiver of the Solar Orbiter/RPW instrument.
Electrical auto/cross-correlations measured by the receiver are given in V^2/Hz (calibration takes already account of the harness + pre-amplifiers gain/phase contributions).
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 |
| Max Frequency range | 500 kHz to 16 MHZ |
| Max Frequency number | 321 |
| Min Frequency step | 50 kHz |
| Frequency scale | Linear |
| Time resolution | 0.1 sec to 5.4 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 a set of HFR (AGC1, AGC2) acquisition at a given time and frequency. See the CHANNEL_STATUS zVariable values to know which channel, 1 and/or 2, is connected to HFR and the SENSOR_CONFIG zVariable value to know with which sensor configuration.
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 | |
| SYNCHRO_FLAG | CDF_UINT1 [1] | Flag indicating if the receiver time is synchronized or not | |
| SWEEP_NUM | CDF_UINT4 [1] | HFR sweep index number in the current file | |
| SAMPLE_TIME | CDF_REAL8 [1] | Time of the HFR data sample since the beginning of the current sweep. Time is computed at the middle of the measurement. | |
| TICKS_NR | CDF_UINT4 [1] | Number of ticks between two HFR samples | |
| DELTA_TIME | CDF_REAL8 [1] | 𝛍s | Delta time of the HF band between two data samples in microseconds. Computed from TICKS_NR * (1 tick =15.258 𝛍s) |
| SWEEP_MODE | CDF_UINT1 [1] | HFR sweep mode of the current record | |
| SURVEY_MODE | CDF_UINT1 [1] | THR survey mode | |
| CHANNEL_STATUS | CDF_UINT1 [2] | HFR channel status of the current record | |
| AVERAGE_NR | CDF_UINT1 [1] | Number of averages applied (16, 32, 64 or 128) | |
| FRONT_END | CDF_UINT1 [1] | Front end setting (0=GND, 1=PREAMP,2=CAL) | |
| SENSOR_CONFIG | CDF_UINT1 [2] | Indicates the THR sensor configuration (HF_V1-V2=9, HF_V2-V3=10, HF_V3-V1=11) | |
| RPW_STATUS | CDF_UINT1 [15] | Flag indicating status of15 RPW sub-systems | |
| TEMPERATURE | CDF_UINT1 [4] | Temperature of the 3 HF PAs and analog, in degrees. In the case of an internal calibration mode, it contains the PCB temperature and the 3 Voltages. | |
| HFR_BAND | CDF_UINT1[1] | HFR frequency band of the current record. Possible values are: 1=HF1, 2=HF2. | |
| INTEGRATION_TIME | CDF_UINT1 [1] (NRV) | ms | Integration time of a single measurement on the HF band. Total measurement duration T (ms) over a sweep cycle is T = AVERAGE_NR * INTEGRATION_TIME * N_FREQ, where AVERAGE_NR is the number of averages (i.e., 16, 32, 64 or 128) and N_FREQ is the number of frequencies in the current sweep. |
| BANDWIDTH | CDF_UINT1 [1] | kHz | HFR frequency bandwidth |
| FREQUENCY | CDF_UINT2 [1] | kHz | Frequency of analysis |
| AGC1 | CDF_DOUBLE [1] | V2/Hz | Power spectral density at receiver+PA on channel 1 before applying antenna gain, for the current frequency |
| AGC2 | CDF_DOUBLE [1] | V2/Hz | Power spectral density at receiver+PA on channel 2 before applying antenna gain, the current frequency |
| CHANNEL_LABEL | CDF_CHAR [2] (NRV) | Label for channel (1, 2) | |
| RPW_STATUS_LABEL | CDF_CHAR [15] (NRV) | Label for 15 RPW subsystem status | |
| TEMPERATURE_LABEL | CDF_CHAR [4] (NRV) | Label for 3 PA temperatures + 1 analog | |
| SYNCHRO_FLAG | CDF_UINT1[1] | Flag indicating if the receiver time is synchronised or not (0=Not synchronized, 1=Synchronized) | |
| 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
| ISSUE | MITIGATION(S) |
|---|---|
| RPW MY (3) electrical antenna signal was lost intermittently between November 13th and March 15th. HFR acquisitions were impacted when measurements were performed in a dipole mode including 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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