The enclosed subdirectories contain archived versions of WISPR data from prior releases that have subsequently been replaced by newer versions.

Each calibration release will have its own 'rel.yyyymmdd' directory, corresponding to the initial release date of that revision of the calibration. A given calibration release may have multiple versions of files within it. 

If a new version of files is required without a new calibration due to a different issue, this will also be placed in the same folder, as it was processed the same way. Dates will be added to this file to explain the reasons for any re-release.
 
We provide access to these archive files for completeness, but users seeking to analyze the WISPR observations should only use the most recent release/versions, available via https://wispr.nrl.navy.mil/wisprdata.

Please contact any member of the WISPR team with questions about this.

rel.20191112: 
   2019/11/12: This is an archive of the first data PSP data released on November 12, 2019 with the original calibrations

rel.20200915:
   2020/09/15: After a calibration update to the level 2 files, these files were outdated and replaced with improved versions
   2023/01/03: An issue with L2 high cadence images was detected, so these files were correctly re-processed and updated 

rel.20240215:
   2024/02/15: WISPR-0 L2s for encounters 10-15 have been re-processed with a new straylight correction. L3s have been re-released, but there is no meaningful change to them.