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: http://www.sao.ru/Doc-en/Science/results/ar_solar/res2011.html
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A comparison of radiation in the corona above the spot in the radio
and X-ray ranges
In the observations of the 04.01.2011 solar eclipse at the RT-32 (the
observatories Svetloe and Zelenchukskaya) and RATAN-600 radio telescopes
the limiting angular resolution (1 arc second) in the eclipse observations
in the microwave frequency range was reached for the first time, determined
by the diffraction on the lunar limb. We obtained accurate measurements of
the effective height above the photosphere, where in the corona the source
of microwave radiation over the spots is located.
The positions of the spot center in the radio range with the images
in the coronal lines of the ultraviolet and X-ray ranges were compared.
It was found that the measured high brightness temperature of the radio
source above the spot, amounting to 6 million degrees, does not yield
any luminance in the coronal lines. This indicates a different nature
of plasma heating in the radio, EUV and X-ray frequency ranges.
(Contact - Peterova N.G.)
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