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Shrinking and Cooling of Flare Loops in a Two-Ribbon Flare (CROSBI ID 121339)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Vršnak, Bojan ; Temmer, Manuela ; Veronig, Astrid ; Karlicky, Marian ; Lin, Jun Shrinking and Cooling of Flare Loops in a Two-Ribbon Flare // Solar physics, 234 (2006), 273-299-x

Podaci o odgovornosti

Vršnak, Bojan ; Temmer, Manuela ; Veronig, Astrid ; Karlicky, Marian ; Lin, Jun

engleski

Shrinking and Cooling of Flare Loops in a Two-Ribbon Flare

We analyze the evolution of the flare/postflare-loop system in the two-ribbon flare of November 3, 2003, utilizing multi-wavelength observations that cover the temperature range from several tens of MK down to 10^4 K. A non-uniform growth of the loop system enables us to identify analogous patterns in the height&#8211; time, h(t), curves measured at different temperatures. The &#8220; knees, &#8221; &#8220; plateaus, &#8221; and &#8220; bends&#8221; in a higher-temperature curve appear after a certain time delay at lower heights in a lower-temperature curve.We interpret such a shifted replication as a track of a given set of loops (reconnected field lines) while shrinking and cooling after being released from the reconnection site. Measurements of the height/time shifts between h(t) curves of different temperatures provide a simultaneous estimate of the shrinkage speed and cooling rate in a given temperature domain, for a period of almost ten hours after the flare impulsive phase. From the analysis we find the following: (a) Loop shrinkage is faster at higher temperatures &#8211; in the first hour of the loop-system growth, the shrinkage velocity at 5MK is 20 &#8211; 30 km s&#8722; 1, whereas at 1MK it amounts to 5 kms&#8722; 1 ; (b) Shrinking becomes slower as the flare decays &#8211; ten hours after the impulsive phase, the shrinkage velocity at 5MK becomes 5 kms&#8722; 1 ; (c) The cooling rate decreases as the flare decays &#8211; in the 5MK range it is 1MKmin&#8722; 1 in the first hour of the loop-system growth, whereas ten hours later it decreases to 0.2MKmin&#8722; 1 ; (d) During the initial phase of the loop-system growth, the cooling rate is larger at higher temperatures, whereas in the late phases the cooling rate apparently does not depend on the temperature ; (e) A more detailed analysis of shrinking/cooling around one hour after the impulsive phase reveals a deceleration of the loop shrinkage, amounting to &macr ; ; a &#8776; 10ms&#8722; 2 in the T < 5MK range ; (f) In the same interval, conductive cooling dominates down to T &#8776; 3 MK, whereas radiation becomes dominant below T &#8776; 2 MK ; (g) A few hours after the impulsive phase, radiation becomes dominant across the whole T < 5MK range. These findings are compared with results of previous studies and discussed in the framework of relevant models.

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Podaci o izdanju

234

2006.

273-299-x

objavljeno

0038-0938

Povezanost rada

Fizika

Indeksiranost