--- title: SPICE Data Release 1.0 author: SPICE consortium date: 2021-12-24 geometry: a4paper colorlinks: true lang: en-US standalone: true titlepage: true header-includes: --- DOI:[10.48326/idoc.medoc.spice.1.0](https://doi.org/10.48326/idoc.medoc.spice.1.0) Access to data: [https://spice.osups.universite-paris-saclay.fr/spice-data/release-1.0/](https://spice.osups.universite-paris-saclay.fr/spice-data/release-1.0/) and through the ESA [Solar Orbiter Archive](http://soar.esac.esa.int/). This data pack contains Solar Orbiter/SPICE data recorded during Short Term planning Period 122 (STP122, Nov. 16-23, 2020). These data were acquired early in the mission, under variable instrument configurations. We only distribute the Level 2 (calibrated) data for this release. In case issues in the Level 2 data are found that require to investigate the conversion from Level 1 to Level 2, access can be granted to the Level 1 data and to the software used to convert it. The processing software will eventually be released in SolarSoft. However, it should be clear that Level 2 data is the data product that scientists should use for their research. Level 2 data takes into account all the calibration parameters quantified at the time of the release. ## Documentation * The SPICE instrument is described in: [SPICE consortium et al 2020, A&A](https://doi.org/10.1051/0004-6361/201935574) * The processing steps applied to produce the L2 data are described in section 3.3.3 of the [Data Product Description Document](https://spice.ias.u-psud.fr/spice-data/documents/SPICE-UIO-DPDD-0002-1.4-Data_Product_Description_Document.pdf) * A very preliminary version of a [SPICE data user's manual](https://spice-wiki.ias.u-psud.fr/doku.php/data:data_analysis_manual) ## Known limitations * The wavelength calibration is the pre-flight one. In-flight wavelength calibration is ongoing. The wavelength calibration will be updated in subsequent releases. * Burn-in of the detector is not yet taken into account. At the time of the release however, there is no evidence of significant burn-in. * The pointing as reported in the headers is based on pre-flight measurements of the co-pointing between SPICE and the spacecraft. Registration by cross-correlation is required before the data can be compared with that from other instruments. * The spatial resolution is lower than measured pre-flight: 5.4” from ground tests, 6.7” in flight. * The spectral resolution is lower than measured pre-flight: (a) 2” slit, SW channel: ground test – 4.7 pixels, flight – 7.8 pixels; (b) 2” slit, LW channel: ground test – 5.3 pixels, flight – 9.4 pixels. * There is a systematic bias in measurements of Doppler velocities correlated to the intensity gradients — an effect qualitatively similar to what was reported in SoHO/CDS ([Haugan 1999](https://doi.org/10.1023/A:1005110421725)) and Hinode/EIS ([Young et al. 2012](https://doi.org/10.1088/0004-637X/744/1/14); [Warren et al. 2018](https://doi.org/10.3847/1538-4357/aaa9b8)), although with a larger magnitude. The source of this bias appears to be a combination of anisotropic PSFs (i.e., astigmatism) in both the telescope and spectrometer sections. An effort is on-going to model the effect and to devise corrective actions. As of today, we recommend not to interpret Doppler velocities in SPICE data without contacting the instrument team for advice. ## Citation & acknowledgements Scientific papers using SPICE data from this data release must: * Cite the SPICE instrument paper "SPICE consortium et al, A&A, 2020 DOI:[10.1051/0004-6361/201935574](https://doi.org/10.1051/0004-6361/201935574)"; * Cite this data release: DOI:10.48326/idoc.medoc.spice.1.0. This can be done following the suggestions by [DataCite](https://doi.datacite.org/dois/10.48326%2Fidoc.medoc.spice.1.0); * Include the following statement in the acknowledgements section: > The development of SPICE has been funded by ESA member states and ESA. It was built and is operated by a multi-national consortium of research institutes supported by their respective funding agencies: STFC RAL (UKSA, hardware lead), IAS (CNES, operations lead), GSFC (NASA), MPS (DLR), PMOD/WRC (Swiss Space Office), SwRI (NASA), UiO (Norwegian Space Agency). The usage of SPICE images as online web graphics or in printed materials must mention "Image Courtesy: ESA/Solar Orbiter/SPICE".