CORONAS-F Solar Observations

Details CORONAS-F Solar Observations CORONAS-F Solar Observations

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....4848o&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #4848

Computer Science

Scientific paper

Observations of the Sun made within the CORONAS-F mission during 2001-2002 have been discussed. The broadband measurements obtained with the multi-channel photometer DIFOS in six spectral channels (350, 500, 650, 850, 1100, and 1500 nm) have been used to plot the amplitude spectra of p-modes of the global solar oscillations and to determine the relative oscillation amplitudes as a function of the wavelength. The spectrophotometer DIOGENESS and X-ray spectrometer RESIK recorded multiple spectral lines in the 3-7 Å X-ray range from the most intensive solar flares, which could not be measured earlier, because all previous instruments went off-scale, i.e. the line profiles were cut-off in amplitude. High-resolution temporal series of monochromatic full-Sun images in the L MgXII emission line at 8.42 Å have been obtained by the SPIRIT spectroheliograph. The images revealed plasma structures with the temperature in the range 3 20 MK characterized by specific shape and dynamics, differing from that of relatively low temperature (1 2 MK) plasma. The main remarkable features of the phenomena observed for the first time in monochromatic images are as follows: high spatial variability in brightness with the contrast of more than two orders of magnitude; presence of some compact sources with high locations up to 0.3 solar radius and well-pronounced ’spider’-like forms; substantially different variability in the dynamic behaviour characterized by the life-times from minutes to days. The gamma-ray spectrometer HELICON and flare spectrometer IRIS provided high-resolution (10 milliseconds) records of the flare-generated X-ray emission. These records were used to identify the characteristic features of pre-flare situation in the Sun and the flare process itself.

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