solo_L2_rpw-lfr-surv-asm data provides Averaged Spectral Matrices (ASM) in survey mode, computed for the three frequency ranges F0, F1, and F2 of the LFR analyser of the Solar Orbiter/RPW instrument. ASMs are produced routinely on-board with three magnetic and two electric field components corresponding to 5 × 5 electromagnetic spectral matrices. Their components are calculated as auto and cross power spectra.
L2 Averaged Spectral Matrices are fully calibrated in physical units and expressed both in spacecraft reference frame (SRF) and in sensor axis reference frame.

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 Averaged Spectral Matrices
Intensity units (V/m)²/Hz, nT²/Hz or V/m*nT/Hz
Frequency range 7 to 9984 HZ
Frequency number 288
Frequency step 1 Hz (F2), 16Hz (F1) and 96 Hz (F0)
Frequency scale Linear
Time resolution 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.
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
Epoch_F0 CDF_TIME_TT2000[1] ns Epoch time for F0 ASM
Epoch_F1 CDF_TIME_TT2000[1] ns Epoch time for F1 ASM
Epoch_F2 CDF_TIME_TT2000[1] ns Epoch time for F2 ASM
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_UINT2[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 ASM : F0, F1 or F2 in order to use only one skeleton for the 3 normal mode asm products of ICD.
F0 CDF_REAL4[88] - NRV Hz Frequencies of ASM at F0
F1 CDF_REAL4[104] - NRV Hz Frequencies of ASM at F1
F2 CDF_REAL4[96] - NRV Hz Frequencies of ASM at F2
BIAS_MODE_MUX_SET CDF_UINT1[1] unitless 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
ASM_CNT CDF_UINT1[1] Number of matrices read for a given sampling frequency (F0, F1 or F2).
ASM_RE_F0 CDF_REAL4[88,5,5] (V/m)²/Hz, nT²/Hz or V/m*nT/Hz All the real part of the 5x5 calibrated spectral matrices for all bins of F0 sampling frequency.
ASM_IM_F0 CDF_REAL4[88,5,5] (V/m)²/Hz, nT²/Hz or V/m*nT/Hz All the imaginary part of the 5x5 calibrated spectral matrices for all bins of F0 sampling frequency.
ASM_RE_F1 CDF_REAL4[104,5,5] (V/m)²/Hz, nT²/Hz or V/m*nT/Hz All the real part of the 5x5 calibrated spectral matrices for all bins of F1 sampling frequency.
ASM_IM_F1 CDF_REAL4[104,5,5] (V/m)²/Hz, nT²/Hz or V/m*nT/Hz All the imaginary part of the 5x5 calibrated spectral matrices for all bins of F1 sampling frequency
ASM_RE_F2 CDF_REAL4[96,5,5] (V/m)²/Hz, nT²/Hz or V/m*nT/Hz All the real part of the 5x5 calibrated spectral matrices for all bins of F2 sampling frequency.
ASM_IM_F2 CDF_REAL4[96,5,5] (V/m)²/Hz, nT²/Hz or V/m*nT/Hz All the imaginary part of the 5x5 calibrated spectral matrices for all bins of F2 sampling frequency.
ASM_RE_F0_SRF CDF_REAL4[88,5,5] (V/m)²/Hz, nT²/Hz or V/m*nT/Hz All the real part of the 5x5 calibrated spectral matrices for all bins of F0 sampling frequency in spacecraft reference frame (SRF).
ASM_IM_F0_SRF CDF_REAL4[88,5,5] (V/m)²/Hz, nT²/Hz or V/m*nT/Hz All the imaginary part of the 5x5 calibrated spectral matrices for all bins of F0 sampling frequency in spacecraft reference frame (SRF).
ASM_RE_F1_SRF CDF_REAL4[104,5,5] (V/m)²/Hz, nT²/Hz or V/m*nT/Hz All the real part of the 5x5 calibrated spectral matrices for all bins of F1 sampling frequency in spacecraft reference frame (SRF).
ASM_IM_F1_SRF CDF_REAL4[104,5,5] (V/m)²/Hz, nT²/Hz or V/m*nT/Hz All the imaginary part of the 5x5 calibrated spectral matrices for all bins of F1 sampling frequency in spacecraft reference frame (SRF).
ASM_RE_F2_SRF CDF_REAL4[96,5,5] All the real part of the 5x5 calibrated spectral matrices for all bins of F2 sampling frequency in spacecraft reference frame (SRF).
ASM_IM_F2_SRF CDF_REAL4[96,5,5] All the imaginary part of the 5x5 calibrated spectral matrices for all bins of F0 sampling frequency in spacecraft reference frame (SRF).
SYNCHRO_FLAG CDF_UINT1[1] Time synchronization flag

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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