The Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI)
satellite was launched on 5 February 2002. Its objective is to
study the energy release and particle acceleration in solar flares
through observations of X-rays and gamma rays. Two novel
technologies are combined to obtain both spectra and images over a
broad energy range. For the spectroscopy, cooled hyperpure
germanium detectors are used to cover the energy range from 3 keV
to 17 MeV with unprecedented keV-class resolution. Since focusing
optics are not possible for making images with such high energy
photons, tungsten and molybdenum absorbing grids are used to
modulate the X-rays and gamma-rays coming from the Sun as the
spacecraft rotates. This allows the spatial Fourier components of
the source to be determined so that images can be made in spectral
ranges where astronomical images have never been produced before.
These new instrumental techniques require equally innovative
software to reconstruct X-ray and gamma-ray spectra and images from
the observations.
Ample solar activity, abundant observations, and an open data
policy have attracted many researchers. Astronomers face in the
RHESSI mission an exciting new scientific potential. It has
unusually broad possibilities for improving our understanding of
the enigmatic solar flare phenomenon that is becoming increasingly
important as society depends more and more on space-based
technologies.
In this volume, the functioning of RHESSI is explained, the data
analysis techniques including spectroscopy and image reconstruction
are introduced, and the experiences of the first few months of
operation are summarized. First scientific results are presented
thatprovide the essential base for more extended studies using
RHESSI data and complementary observations by instruments on other
spacecraft and at ground-based solar observatories.
The accompanying CD-ROM contains X-ray and EUV movies showing
the dynamics of several solar flares. It also contains color
versions of the graphics in the printed papers and additional
material.
Scientists and students will find here the latest discoveries in
solar flare research, as well as inspiration for future work. The
papers will serve as references for the many new discoveries to
come from the continuing RHESSI observations.
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