Written 26-Jun-2024 by Kim Tolbert

The Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) recorded X-ray data between 3 keV and 17 MeV from the Sun between February 2012 and April 2018. Please see the RHESSI web site at https://hesperia.gsfc.nasa.gov/rhessi for a complete description of the mission, the instrument, and the software needed to analyze the data. 

Visibilities are calibrated measurements of Fourier components of the source distribution.  They represent a compact, noise-free transformation of the input imaging data, containing all the information required for image reconstruction.

These directories contain high time- and energy-resolution visibility FITS files for each flare in the RHESSI Image Archive. The visibilities have 8s time resolution and up to 20 energy bins depending on the energy of the flare. All functional detectors (front segments only) are used.  (Visibility FITS files with the same binning as the images in the image archive are in the visibility_fits_v2 directory one level up.)

Please see https://hesperia.gsfc.nasa.gov/rhessi3/data-access/rhessi-data/visibilities/ for more information on the visibility files and how to use them.