solo_L1_rpw-lfr-surv-bp2 data provides uncalibrated Basic Parameters set 2 (BP2) in survey normal and burst modes, computed for the three frequency ranges F0, F1, and F2 of the LFR analyser of the Solar Orbiter/RPW instrument. The BP2s are just a compression of the frequency averaged ASM.

Data have been produced following the method described in Chust et al, 2021 (see references)

Reminder : F0 = 24576 Hz, F1 = 4096 Hz, F2 = 256 Hz and F3 = 16 Hz,

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

Data product key facts
Type of data Basic Parameters Set 2
Intensity units None
Frequency range 10.5 to 9648 Hz in normal mode
120 to 9840 Hz in burst mode
Frequency number 36 in normal mode
48 in burst mode
Frequency step 8Hz (F2), 128Hz (F1) and 768Hz (F2) in normal mode
64Hz (F1) and 384Hz (F0) in burst mode
Frequency scale Linear
Time resolution 4 seconds in normal mode and 1 second in burst mode
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.
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.

NAMETYPEUNITDESCRIPTION
Epoch CDF_TIME_TT2000[1] ns Epoch time of the record
ACQUISITION_TIME CDF_UINT4[2] CCSDS CUC Acquisition time as returned in TM packets
QUALITY_FLAG CDF_UINT1[1] Flag to indicate the quality of the data
COMMON_BIA_STATUS_FLAG CDF_UINT1[1] LFR common parameters and BIAS status info relevancy flag
QUALITY_BITMASK CDF_UINT1[1] Additional flag to add quality information
SURVEY_MODE CDF_UINT1[1] LFR survey mode
FREQ CDF_UINT1[1] Index to indicate the sampling frequency of the snapshot : F0, F1 or F2 in order to use only one skeleton for the 3 normal mode asm products of ICD.
BIAS_MODE_MUX_SET CDF_UINT1[1] Copy of multiplexer setting
BIAS_MODE_HV_ENABLED CDF_UINT1[1] Copy of enable/disable HV (+- 100V).
BIAS_MODE_BIAS1_ENABLED CDF_UINT1[1] Copy of enable/disable BIAS 1.
BIAS_MODE_BIAS2_ENABLED CDF_UINT1[1] Copy of enable/disable BIAS 2.
BIAS_MODE_BIAS3_ENABLED CDF_UINT1[1] Copy of enable/disable BIAS 2.
BIAS_ON_OFF CDF_UINT1[1] Copy of BIAS status
BW CDF_UINT1[1] BIAS Works/BIAS Fails configuration
SP0 CDF_UINT1[1] Shaping of electrical data
SP1 CDF_UINT1[1] Shaping of electrical data
R0 CDF_UINT1[1] Rooting of electrical data
R1 CDF_UINT1[1] Rooting of electrical data
R2 CDF_UINT1[1] Rooting of electrical data
BP2_CNT CDF_UINT1[1] Number of BP2 sets read for a given sampling frequency (F0, F1 or F2).
AUTO CDF_REAL8[26,5] Component of autovariances from the EM data stream
CROSS_RE CDF_REAL4[26,10] Real part of complex cross correlations from the EM data
CROSS_IM CDF_REAL4[26,10] Imaginary part of complex cross correlations from the EM data
ACQUISITION_TIME_UNITS CDF_CHAR[2] Label for ACQUISITION_TIME UNIT_PTR attribute
ACQUISITION_TIME_LABEL CDF_CHAR[2] Label for ACQUISITION_TIME
SCET CDF_REAL8[1] Ticks Spaceraft Elapsed Time
SYNCHRO_FLAG CDF_UINT1[1] Flag to indicate if the local time is synchronized with the RPW DPU clock or not. Possible values: synchronized=0, not synchronized=1. This flag is extracted from ACQUISITION_TIME in L0 packets, it is the MSB of the CUC time.

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.

ISSUEMITIGATION(S)

Release notes

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

Authors

Thomas Chust, Rodrigue Piberne, Bruno Katra, Alexis Jeandet and Véronique Bouzid (retired).

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)
• Observations of whistler mode waves by Solar Orbiter’s RPW Low Frequency Receiver (LFR): In-flight performance and first results, Chust et al, A&A, 2021, https://doi.org/10.1051/0004-6361/202140932
• NASA CDF Web portal

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