The data product solo_L2_rpw-lfr-sbm1-bp1 provides Basic Parameters set 1 (BP1) in SBM1 mode, computed for the frequency range F0 of the LFR analyser of the Solar Orbiter/RPW instrument.

DOI: https://doi.org/10.57780/ESA-3XCJD4W
Publisher: ESA
Citation: European Space Agency & Maksimovic, M. (2024). RPW, Radio and Plasma Waves instrument (Version v1.0) [Dataset]. European Space Agency. https://doi.org/10.57780/ESA-3XCJD4W

Link to the data repository

Data files are available from the Solar Orbiter Archive home page.

Copies of the files are also stored in the LIRA local data repository.

Data product overview

The BP1s consist of seven spectral quantities which aim at characterizing the waves: the total electric and magnetic power spectra, the wave normal vector, a wave ellipticity estimator, a wave planarity estimator, the radial-component of the Poynting vector, and a phase velocity estimator.

L2 Basic Parameters set 1 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,

Data product key facts
Type of data Basic Parameters Set 1
Intensity units (V/m²)/Hz, nT²/Hz, nW/m^2/Hz, km/s, or None
Frequency range 1776 to 9840 Hz
Frequency number 22
Frequency step 384Hz
Frequency scale Linear
Time resolution 0.25 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
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
L2_QUALITY_BITMASK CDF_UINT1[1] Flag to indicate specific quality issue for L2 data
F0 CDF_REAL4[22] - NRV Hz Frequencies of BP1 at F0
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
BP1_CNT CDF_UINT1[1] Number of BP1 sets read for a given sampling frequency (F0, F1 or F2).
PE_F0 CDF_REAL8[22] (V/m²)/Hz Spectral power of E field at F0
PB_F0 CDF_REAL8[22] nT²/Hz Spectral power of B field at F0
NVEC_F0 CDF_REAL4[22,3] Wave normal vector from magnetic field at F0
NVEC_F0_SRF CDF_REAL4[22,3] Wave normal vector from magnetic field at F0 in spacecraft reference frame (SRF).
ELLIP_F0 CDF_REAL8[22] Wave ellipticity from magnetic field at F0
DOP_F0 CDF_UINT1[22] Degree of polarization from magnetic field at F0
SX_REA_F0 CDF_REAL8[22] nW/m^2/Hz Real parts of the X component of the Poynting vector at F0
SX_ARG_F0 CDF_UINT1[22] Argument bit = 1 if abs(Im(SX)) > abs(Re(SX)) else 0, at F0
VPHI_REA_F0 CDF_REAL8[22] km/s Phase velocities estimated from the X projection of Maxwell-Faraday equation at F0
VPHI_ARG_F0 CDF_UINT1[22] Argument bit = 1 if abs(Im(SX)) > abs(Re(SX)) else 0, at F0
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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