SOHO/Charge, Element, and Isotope Analysis System (CELIAS) Data Archive

The CELIAS instrument is designed to study the composition of the solar
wind (SW) and of solar and interplanetary energetic particles on
SOHO. SOHO is a project of international cooperation between ESA and
NASA. The CELIAS instrument consists of three different sensors with
associated electronics, which are optimized each for a particular
aspect of ion composition. These aspects are the elemental, isotopic,
and ionic charge composition of SW or energetic ions emanating from
the Sun. In addition, the Solar EUV Monitor (SEM) has been included
into CELIAS for monitoring the absolute EUV flux from the Sun.

Particle abundance observations of the solar wind and of solar
energetic particles (SEP) by itself, and in close correlation with
optically observable phenomena on the Sun, will allow to tackle
basically unsolved questions in solar physics such as: (1) the steady
heating process in the corona, (2) SW acceleration processes, (3)
dynamic heating phenomena driven by magnetic fields or waves,
e.g. heating in coronal mass ejections, filament eruptions, flares,
(4) SEP acceleration processes, (5) processes leading to variations in
abundances (elemental, ionic charge, isotopic) and (6) the relation
between composition and events/regions in the solar atmosphere.

Further scientific goals of CELIAS are to study the composition and
dynamics of interplanetary pick-up ions in correlation with the solar
EUV flux. For this purpose a solar EUV flux monitor (SEM) for the
wavelength 17 to 70 nm has been included into the CELIAS instrument as
a sub-unit of the STOF sensor. The SEM serves also to monitor the
total absolute EUV flux for the large EUV telescopes on SOHO.

Evidently, the understanding of the phenomena outlined above requires
collaboration with many other astrophysical disciplines. Among them
are ground based observations including radio astronomical data
(e.g. the well known Type III kilometric radio bursts which are
related to the strong enrichment of certain species in SEP's) or the
interpretation of solar wind abundances in terms of solar abundances
as derived from photospheric spectra, meteoritic composition, and from
solar oscillation data.

All SOHO/CELIAS data are available from the public SOHO data archive:
http://sohowww.nascom.nasa.gov/data/data.html

Mirror archives are available at:
SOHO Archive at Rutherford Appleton Laboratory, UK.:
http://trace.solararchive.rl.ac.uk/soho/

SOHO Archive at the Institut d'Astrophysique Spatiale, France:
http://idc-medoc.ias.u-psud.fr/

SOHO Archive at Osservatorio Astronomico di Torino, Torino, Italy:
http://solar.to.astro.it/