RPW Data Center
solo_L2_rpw-lfr-surv-cwf-b
solo_L2_rpw-lfr-surv-cwf-b data provides the magnetic field continuous waveforms of the three components, measured in survey mode by the SCM sensor and LFR analyzer of the Solar Orbiter/RPW instrument. Data sampled at 16 Hz or 256 Hz is calibrated to correct sensor and analyzer transfer functions. The sampling rate can change throughout the file.The magnetic field is expressed in the SCM frame, as well as in the RTN frame of reference.
This data product has been produced following the method described in technical documentation.
DOI: https://doi.org/10.57780/esa-3xcjd4w
| Type of data | Continuous waveform of the magnetic field |
|---|---|
| Units | nT |
| Sampling rate | 16 Hz and/or 256 Hz |
| 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.
| NAME | TYPE | UNIT | DESCRIPTION |
|---|---|---|---|
| Epoch | CDF_TIME_TT2000 [1] | ns | Epoch time of the record |
| B | CDF_REAL4[3] | nT | 3 entries array with magnetic field values (B3x, B1y, B2z) in SCM frame |
| B_RTN | CDF_REAL4[3] | nT | 3 entries array with magnetic field values (Br, Bt, Bn) in RTN frame |
| SURVEY_MODE | CDF_UINT1 | Flag to indicate if the receiver in the SURVEY_BURST (=1) or SURVEY_NORMAL (=0) mode | |
| CALIBRATION_TABLE_INDEX | CDF_UINT1[2,2] | Calibration tables used: (i,1) = k gives the name of the calibration table file as gEntry[k] of Global attribute CALIBRATION_TABLE, and (i,2) gives the record number in the calibration table file. | |
| L2_QUALITY_BITMASK | CDF_UINT2 | Flag to indicate any context or events that can alterate data
| |
| QUALITY_BITMASK | CDF_UINT2 | Flag to indicate any context information or status at the receiver or experiment level. The value is inherited from the L1 parent | |
| QUALITY_FLAG | CDF_UINT1 | Flag to indicate the quality of the data from 0: Bad to 4: Excellent | |
| SAMPLING_RATE | CDF_REAL4 | Hz | Sampling rate |
| CARTESIAN_REPRESENTATION | CDF_CHAR[3] | Cartesian representation of a magnetic vector | |
| MAG_LABEL | CDF_CHAR[3] | Labels of the Magnetic fields components in the SCM frame = (Bx, By, Bz) | |
| MAG_LABEL_RTN | CDF_CHAR[3] | Labels of the Magnetic fields components in the RTN frame = (Br, Bt, Bn) |
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) |
|---|---|
| The magnetic field is greatly disturbed when the SCM heaters are switched on and off. | When the heater signature could be located in the signal, it was subtracted before calibration, bit1 of L2_QUALITY_BITMASK is set to 1 and QUALITY_FLAG is capped to 2 |
| LFR calibration signal is sometimes superimposed on the interplanetary magnetic field | bit2 of L2_QUALITY_BITMASK is set to 1 and QUALITY_FLAG is capped to 2 |
| Interferences from spacecraft equipment are present above the sensitivity of SCM at 8 Hz, 16 Hz and harmonics. Other interferences can be noted at 1.3 Hz and harmonics | Peaks caused by these interferences are easily identifiable in the power spectrum |
Release notes
See MODS global attribute in the CDF files for an history of the data modifications.
Authors
Matthieu Kretzschmar and Jean-Yves Brochot.
References
• The Solar Orbiter Radio and Plasma Waves (RPW) instrument, Maksimovic et al., A&A, 2020 (https://doi.org/10.1051/0004-6361/201936214)
• Jannet, G., Dudok de Wit, T., Krasnoselskikh, V., Kretzschmar, M., Fergeau, P., Bergerard-Timofeeva, M., et al. (2021). Measurement of magnetic field fluctuations in the Parker Solar Probe and Solar Orbiter missions. Journal of Geophysical Research: Space Physics, 126, e2020JA028543 (https://doi.org/10.1029/2020JA028543)
• Metadata Definition for Solar Orbiter Science Data, Helen R. Middleton
• RPW Data Product Description Document (DPDD)
• NASA CDF Web portal
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