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Small-Scale High-Temperature Structures in Flare Regions

Chernov, G. P.; Kovalev, V. A.; Hanaoka, I.

When analyzing YOHKOH/SXT, HXT (soft and hard X-ray) images of solar flares against the background of plasma with a temperature T ~ 6 MK, we detected localized (with minimum observed sizes of approximately 2000 km) high-temperature structures (HTSs) with T = (20-50) MK with a complex spatial-temporal dynamics. Quasi-stationary, stable HTSs form a …

Observations of Bright Coronal Points at Wavelengths of 5.2 and 1.76 cm

Maksimov, V. P.; Prosovetskii, D. V.; Krissinel, B. B.

Based on two-dimensional solar images obtained with the Siberian Solar Radio Telescope and the Nobeyama Radio Heliograph and using YOHKOH soft X-ray images, we investigate bright coronal points. The principal microwave emission mechanism of these points is shown to be the thermal bremsstrahlung of an optically thin plasma. The fact that, in severa…