SECCHI/HI Level-2 files from SwRI

C. E. DeForest, March 2015

The L2 data from SwRI exist in FITS form for both STEREO-A HI-1 and STEREO-A HI-2, through the end of 2013. They are photometric images of feature-excess brightness (radiance) in Thomson scattered light, extracted from the original images. The L1 photometry was performed using the standard SECCHI_PREP pipeline. Subsequent processing was as described initially in by DeForest, Howard & Tappin 2011 (Astrophys. J. 738, 103). Like the L1 data, the images are calibrated in "mean solar radiance" units (B_\odot or B_s), which consist of the solar intensity divided by its apparent size in steradians. A paper is in work for Astrophys. J. describing the processing in more detail.

Additional information can be found in the individual subdirectories.

ARTIFACTS TO AVOID

The HI data, particularly the HI-2 data, contain many artifacts that must be distinguished visually from the actual data. A non-exclusive list follows. In case of doubt, you can contact the instrument team, Craig DeForest, or Tim Howard (deforest@boulder.swri.edu).

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