Sunday 5 November 2023, by Baptiste Cecconi, Xavier Bonnin
This collection is contains the daily direction finding (aka goniopolarimetric) Level 3 datasets for the Waves/LFR and Waves/HFR receivers onboard the STEREO-A and STEREO-B spacecraft.
The data collection contains daily Level 3 direction finding (aka goniopolarimetric) CDF files, derived from the Low Frequency Receiver (LFR) and High Frequency Receiver (HFR) of STEREO-A/Waves and STEREO-B/Waves spacecraft. This data collection has been produced following the goniopolarimetric inversion described in Krupar et al (2012).
Content
The collection is composed of daily CDF files, which variables are described in the table below. They are available in the cdf/ directory, with a directory structure based in the year and month of observation.
| Name | Type | Length | Unit | Description |
|---|---|---|---|---|
| Epoch | CDF_TT2000 | (N) | ns | Epoch encoded as Terrestrial Time on rotating Earth geoid, ns since J2000 |
| SENSOR_CONFIG | CDF_BYTE | (N,319,3) | Dual channel receiver antenna configuration | |
| TIMING | CDF_FLOAT | (N,319,3) | s | Temporal offset of each antenna channel configuration |
| QUALITY_FLAG | CDF_INT | (N) | High level information about the quality of the electric field measurements | |
| INTERPOL_FLAG | CDF_INT | (N,319) | Flag that indicates if the current record is real or interpolated | |
| PSD_V2 | CDF_FLOAT | (N,319,3,2) | V^2/Hz | Power spectral density before 1% background subtraction and antenna calibration |
| PSD_FLUX | CDF_FLOAT | (N,319) | W/m^2/Hz | Power spectral density after 1% background subtraction and antenna calibration |
| PSD_SFU | CDF_FLOAT | (N,319) | sfu | Power spectral density after 1% background subtraction and antenna calibration in solar radio flux unit normalized to 1 au |
| STOKES_I | CDF_FLOAT | (N,319) | W/m^2/Hz | Radio flux density |
| STOKES_Q | CDF_FLOAT | (N,319) | Normalized linear polarization | |
| STOKES_U | CDF_FLOAT | (N,319) | Normalized linear polarization | |
| STOKES_V | CDF_FLOAT | (N,319) | Normalized circular polarization | |
| SOURCE_SIZE | CDF_FLOAT | (N,319) | deg | The angular half aperture of the source as seen by a spacecraft (uniform profile) |
| WAVE_COLATITUDE_RTN | CDF_FLOAT | (N,319) | deg | Wave vector colatitude in the Radial-Tangential-Normal (RTN) system |
| WAVE_AZIMUTH_RTN | CDF_FLOAT | (N,319) | deg | Wave vector azimuth in the Radial-Tangential-Normal (RTN) system |
| WAVE_COLATITUDE_HCI | CDF_FLOAT | (N,319) | deg | Wave vector colatitude in the Heliocentric Inertial (HCI) system |
| WAVE_AZIMUTH_HCI | CDF_FLOAT | (N,319) | deg | Wave vector azimuth in the Heliocentric Inertial (HCI) system |
| WAVE_COLATITUDE_HEE | CDF_FLOAT | (N,319) | deg | Wave vector colatitude in the Heliocentric Earth Ecliptic (HEE) system |
| WAVE_AZIMUTH_HEE | CDF_FLOAT | (N,319) | deg | Wave vector azimuth in the Heliocentric Earth Ecliptic (HEE) system |
| WAVE_COLATITUDE_HEEQ | CDF_FLOAT | (N,319) | deg | Wave vector colatitude in the Heliocentric Earth Equatorial (HEEQ) system |
| WAVE_AZIMUTH_HEEQ | CDF_FLOAT | (N,319) | deg | Wave vector azimuth in the Heliocentric Earth Equatorial (HEEQ) system |
| SC_POS_HCI | CDF_FLOAT | (N,3) | km | STEREO spacecraft position in the Heliocentric Inertial (HCI) system in km |
| SC_POS_HEE | CDF_FLOAT | (N,3) | km | STEREO spacecraft position in the Heliocentric Earth Ecliptic (HEE) system in km |
| SC_POS_HEEQ | CDF_FLOAT | (N,3) | km | STEREO spacecraft position in the Heliocentric Earth Equatorial (HEEQ) system in km |
The file naming convention is: stX_l3_wav_RRR_yyyymmdd_vVV.cdf
X: a 1-letter code for the spacecraft in use (a=STEREO-A; b=STEREO-B);RRR: receiver in use (lfr or hfr).yyyy: Year in 4 digitsmm: Month in 2 digits (0-padded)dd: Day in 2 digits (0-padded)VV: version number (2 digits)Each dataset also contains quicklooks, in the png/ directory, with the same directory structure. Raw IDL Saveset files are also available in the sav/ directory.
Coverage and sampling
Acknowledgements
The STEREO/Waves L3 DF data collection has been produced by V Krupar (NASA/GSFC), QN Nugyen X Bonnin, B Cecconi and M Maksimovic (LESIA/Observatoire de Paris-PSL), with the support of CNRS and CNES.
BC was also supported by PADC and EPN2024-RI. The Europlanet 2024 Research Infrastructure (EPN2024-RI) project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 871149.
Contact
Any question or request should be addressed to contact.maser@obspm.fr