Expected TESIS science outcome
A. Urnov
P.N.Lebedev Physics Institute of RAS, Russia
The capabilities and features of the TESIS instrumentation on board the Coronas-Photon spacecraft are considered from the viewpoint of current problems of atomic and plasma physics of solar corona.
These problems include the location and mechanisms of energy release and its transformation into the heat, XUV radiation, charge particle beams and plasma motions. The interrelation of local transient processes connected with eruptive phenomena - flares, CME, dimmings etc., with global long-term structures persistent in corona is also an important subject of study.
To anticipate possible scientific outcome from the TESIS experiment a short survey is given of the main approaches used in the preceding experiment SPIRIT on the CORONAS-F mission.
The main stress is made on the diagnostics techniques developed for a study of temporal and spatial dynamics of the temperature content of hot plasma structures necessary for understanding
the formation mechanisms of soft X-ray emission. In particular an approach based on a consistent modeling of complex data from CORONAS-F, GOES and RESSI satellites, including the use of time series of
monochromatic full-Sun images in the X-ray Mg XII 8.42 line and EUV lines, provided the spatial electron density and temperature distributions and their temporal evolution for long-duration events.
The method used allowed to verify the absolute intercalibration of the fluxes recorded in all aforementioned experiments and to reference the Mg XII images to the solar disk. A study of elemental abundances
as well as formation mechanisms of EUV emission was shown to be possible on the base of CHIANTI data bank.
Substantial improvements of spatial, spectral and temporal resolution in TESIS experiment as compared to SPIRIT one should allow to diagnose short-duration – impulsive and compact events,
and to study fine structure of their temporal evolution and details of the energy budget. Comparison of EUV and X-ray DEM permits to reveal non-steady state plasma characteristics
connected with transient ionization balance and non-Maxwellian phenomena. Full-Sun monochromatic XUV imaging spectroscopy of TESIS supported by other current extraterrestrial and
ground-based observations has to provide experimental constraints sufficient for selection of possible mechanism and quantitative modeling of complex eruptive phenomena under study.