2.7.1 https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions spase://NASA/NumericalData/STEREO-A/SECCHI/Wavelets NASA NumericalData STEREO SECCHI EUVI Wavelet-processed images 2025-12-04T13:31:35Z 2022-02-24T12:34:56.789 STEREO SECCHI: Initial SPASE XML resource description submission. Metadata submitted by A. Vourlidas on 2022-02-19, reviewed by LFB 2025-09-30T14:25:28Z Updated PublishedBy name to match ROR Registry. Added ResourceType and NamingAuthority. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. Matched version number in schemaLocation attribute to updated value in Version tag. ZCB 2025-12-04T13:31:35Z Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB The EUVI images (all four wavelengths) are processed via a wavelet-based multi-scale algorithm to remove the zeroth order component (primarily stray light). The algorithm is tuned to enhance the off-limb emission in the images. The resulting images are stored as both FITS (using the original header) and PNGs and can be ingested by the SECCHI Solarsoft IDL routines for analysis Please note that all of the SECCHI data is free for public use, but if you use them in presentations, published work, websites, etc, please give the appropriate image credits ("STEREO/SECCHI" will usually suffice). Stenborg, G.A., A. Vourlidas, and R.A. Howard 2008-02-01T00:00:00 Goddard Space Flight Center NASA STEREO spase://SMWG/Person/Brian.Wood PrincipalInvestigator 2020-01-01T00:00:00 spase://SMWG/Person/Angelos.Vourlidas MetadataContact ProjectScientist 2007-01-01T00:00:00 spase://SMWG/Person/William.T.Thompson GeneralContact spase://SMWG/Person/Guillermo.Stenborg Developer 2008-02-01T00:00:00 spase://SMWG/Person/Lee.Frost.Bargatze MetadataContact Algorithm Description https://iopscience.iop.org/article/10.1086/525556 The paper describes the algorithm and its application on the SOHO EIT images but the process is essential identical for the STEREO EUVI images: Stenborg, G., A. Vourlidas, and R.A. Howard, A Fresh View of the Extreme-Ultraviolet Corona from the Application of a New Image-Processing Technique, Astrophys. J., 674(2), 2008. (https://doi.org/10.1086/525556) en spase://SMWG/Repository/NASA/GSFC/STEREO_SC Online Open https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products STEREO Science Center https://stereo-ssc.nascom.nasa.gov/data/ins_data/secchi/wavelets/ APL SECCHI Archive http://solar.jhuapl.edu/Data-Products/EUVI-Wavelets.php en FITS PNG Uncalibrated Level 2 spase://SMWG/Instrument/STEREO-A/SECCHI spase://SMWG/Instrument/STEREO-B/SECCHI ImageIntensity 2006-10-01T00:00:00Z -P3D The EUVI files are wavelet-processed as soon as the level 0 files become available, usually within 3 days of acqusition ExtremeUltraviolet Sun.Corona Sun.TransitionRegion