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Shrinking and cooling of flare loops in a two-ribbon flare
Vrsnak, B1; Temmer, M1; Veronig, A2; Karlicky, M3; Lin J(林隽)4,5; Vrsnak, B (reprint author), Fac Geodesy, Hvar Observ, Zagreb, Croatia.
Source PublicationSOLAR PHYSICS
Contribution Rank第4完成单位
Indexed BySCI
AbstractWe 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 - time, h(t), curves measured at different temperatures. The "knees," " plateaus," and " bends" 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 - in the first hour of the loop-system growth, the shrinkage velocity at 5 MK is 20 - 30 km s(-1), whereas at 1 MK it amounts to 5 km s(-1); (b) Shrinking becomes slower as the flare decays - ten hours after the impulsive phase, the shrinkage velocity at 5 MK becomes 5 km s(-1); ( c) The cooling rate decreases as the flare decays - in the 5 MK range it is 1 MK min(-1) in the first hour of the loop-system growth, whereas ten hours later it decreases to 0.2 MK min(-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 (a) over bar approximate to 10 m s(-2) in the T < 5 MK range; (f) In the same interval, conductive cooling dominates down to T approximate to 3 MK, whereas radiation becomes dominant below T approximate to 2 MK; (g) A few hours after the impulsive phase, radiation becomes dominant across the whole T < 5 MK range. These findings are compared with results of previous studies and discussed in the framework of relevant models.
Subject AreaAstronomy & Astrophysics
WOS IDWOS:000237326300005
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
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Document Type期刊论文
Corresponding AuthorVrsnak, B (reprint author), Fac Geodesy, Hvar Observ, Zagreb, Croatia.
Affiliation1.Faculty of Geodesy, Hvar Observatory, Zagreb, Croatia
2.IGAM/Institute of Physics, University of Graz, Graz, Austria
3.Astronomical Institute of the Academy of Sciences of the Czech Republic, Ondřejov, Czech Republic
4.Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming, Yunnan, P.R. China
5.Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts, U.S.A.
Recommended Citation
GB/T 7714
Vrsnak, B,Temmer, M,Veronig, A,et al. Shrinking and cooling of flare loops in a two-ribbon flare[J]. SOLAR PHYSICS,2006,234(2):273-299.
APA Vrsnak, B,Temmer, M,Veronig, A,Karlicky, M,Lin J,&Vrsnak, B .(2006).Shrinking and cooling of flare loops in a two-ribbon flare.SOLAR PHYSICS,234(2),273-299.
MLA Vrsnak, B,et al."Shrinking and cooling of flare loops in a two-ribbon flare".SOLAR PHYSICS 234.2(2006):273-299.
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