Correlated Dynamics of Hot and Cool Plasmas in Two Solar Flares

Details Correlated Dynamics of Hot and Cool Plasmas in Two Solar Flares Correlated Dynamics of Hot and Cool Plasmas in Two Solar Flares

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mwoc.conf..271k&link_type=abstract

Multi-Wavelength Observations of Coronal Structure and Dynamics -- Yohkoh 10th Anniversary Meeting. Proceedings of the conferenc

Physics

Scientific paper

We report far-ultraviolet observations of a solar limb flare by the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrometer. At a fixed pointing of the slit above the limb, spectra were simultaneously obtained in several emission lines that covered a wide temperature range of ≅ 104 -- 107 K. The temporal evolution of the spectra revealed a high degree of correlation between the dynamical behavior of hot (T ~107 K) and cool (T ~104 K) material during the main flare phase. Hot and cool plasma brightened at nearly the same place, with cool plasma reaching maximum brightness before the hot plasma. The opposite line-of-sight velocities reached their peak values simultaneously. A correlated, rapidly damped oscillatory motion followed, while the excess (turbulent) line widths decayed in a similar manner. This behavior points to an active role of cool plasma in the dynamics of this flare, different from the usual picture of passive cooling after the impulsive phase. An interpretation is suggested in terms of magnetic reconnection which is triggered by rapid localized cooling due to the thermal instability in a loop-loop interaction geometry.

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