Reuven Ramaty High Energy Solar Spectroscopic Imager
The X-ray telescope orbits the earth since 2002, delivering data until 2018.
RHESSI is the precursor of the STIX X-ray telescope.
ROLE OF THE INSTITUTE FOR DATA SCIENCE
> Data management: data browser, host of the RHESSI European Data Centre
> Image processing: compressed sensing algorithm
> Science: analysis of solar flares, particle acceleration
Project lead at i4Ds: André Csillaghy
Partners: international consortium led by University of California at Berkeley
Keywords: space sciences, solar physics, X-ray imaging, data archiving
After more than 16 years of successful operations since its launch in 2002, RHESSI will be decommissioned on October 1, 2018. The on-board receiver has been slowly degrading since 2017, and commanding from the ground has become increasingly difficult. We have not been able to send commands successfully since mid-July 2018. Find more information on the RHESSI mission website.
We will celebrate the successful mission at the Institute for Data Science with some wine, snacks and a short talk by it’s PI Säm Krucker highlighting RHESSI’S journey.
21 September, 17.30, section 5.2A. Everybody is welcome!
RHESSI is a NASA-satellite designed and built with Swiss participation (Paul Schärer Institute and ETH) with an X-ray solar telescope on board observing solar flares. It delivered data from 2002 – 2018, much longer than the initially planned two years. Scientists and engineers at the Institute for Data Science have been involved in all aspects of the mission even before the institute existed. Since 2013, Säm Krucker is the principal investigator of the RHESSI mission through his affiliation with University of California at Berkeley.
PEOPLE @I4DS WORKING WITH RHESSI DATA
Dr. Marina Battaglia
Dr. Matej Kuhar
Dr. Diego Casadei
Dr. Lucia Kleint
OPEN RESOURCES AND RESULTS
VISUALS AND AUDIO
Artist rendition of RHESSI spacecraft. Credits: NASA
The spacecraft tube (image above) and the grid trays (image below) were produced by PSI in Switzerland. Credit: SSL Berkeley
Nine grids were mounted on a grid tray at each end of the telescope tube. The grid pairs modulate the transmission of solar flare x-ray and gamma-ray emissions through to the detectors as the spacecraft spins around the axis of the telescope tube. The modulated count rates in the nine detectors are used in computers on the ground to construct images of solar flares in different energy bands. Credit: SSL Berkeley
The spectrometer contains nine germaniumdetectors that are positioned behind the nine gridpairs on the telescope. Credit: SSL Berkeley
Reconstruction of a solar flare image from X-ray raw data. Column left: back projection, column right: image processed by the compressed sensing algorithm developed at I4DS. Credit: Simon Felix, Roman Bolzern
RHESSI and Solar Dynamis Observatory observed a solar flare at the solar limb. RHESSI’s observations are in blue (gamma-ray) and red (X-ray). This flare has been studied in detail at I4DS. Credit: Marina Battaglia
A multi-mission view of a solar flare: SDO, IRIS, RHESSI. During the height of the flare, we see gamma-ray emission (violet) observed by RHESSI. Credit: NASA’s Scientific Visualization Studio
The Solar Dynamics Observatory and RHESSI observed magnetic reconnection during a solar flare. Credit: NASA/Goddard Space Flight Center Scientific Visualization Studio