RHESSI Mission Archive


RHESSI was in operation for more than 16 years, from February 2002 to April 2018, recording over 120,000 X-ray events over more than a complete 11-year solar cycle. We are generating the Mission Archive products listed below in order to facilitate current analysis of RHESSI observations, and to ensure continued use of the RHESSI science data in years to come. The Mission Archive should be completed by October 2020.

Click the image below to see the distribution and duration of flares throughout the RHESSI mission:

Note: This page and all of the products listed below are currently under development.

Status: In progress

The detector health database provides a snapshot of the status of the front and rear segments of the nine RHESSI detectors at a resolution of one day. Six criteria were examined for each detector segment - off, voltage change, noisy data, unsegmented, and missing data (described in more detail here). The results are stored both in computer-readable csv files and monthly plot files showing green (good), amber (some problems), and red (do not use) indicators for each day for each of the 18 detector segments.

Status: In progress

For every flare in the RHESSI flare catalog, high quality images have been generated for an optimized grid of times and energies customized for each flare, using several of the RHESSI image reconstruction algorithms.

Energy Spectra

Status: Not started

Three types of energy spectrum FITS files and their corresponding detector response (SRM) files will be generated for selected (TBD) flare intervals:

  • Standard energy resolution spectra, combined-detector, multi-orbit files, 4s, 77 energy bins 3-250 keV, for flares > TBD
  • High energy resolution spectra for larger flares (TBD), separate detector, multi-orbit files, 4s, native energy bins
  • For the < 20 RHESSI gamma-ray flares, spectrum and SRM FITS files at appropriate energy and time binning, as well as FITS files of suitable background for each flare

Visibility Database

Status: In progress

Two types of visibility FITS files will be generated for all flare time intervals:

  • Time/energy bins same as in image archive (directory)
  • Finer resolution time/energy bins

Solar Aspect System Calibrated Database

Status: In progress

Generate mission-long Level-1 calibrated SAS data and make the SAS limb and image data available to the broader public.

Gamma-ray Burst Database

Status: ?

Terrestrial Gamma Flashed (TGF) Database

Status: ?

Products that are used internally by the RHESSI software

Calibration Database

Status: In progress

Update and complete existing spectrometer calibration databases:

  • Gain/offset
  • Spectral resolution
  • Low-energy threshold for events ("slow threshold")

Create two new databases (TBD):

  • Recover-ramp-rejection parameters
  • Low-energy threshold for triggers ("fast threshold")

Roll Angle System Calibrated Database

Status: In progress

Provide a verified roll angle database for the full mission.