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


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 (međunarodna recenzija, članak, znanstveni)


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

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

Izvornik
Solar Physics (0038-0938) 234 (2006); 273-299

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Sun - flares
(Sunčevi bljeskovi)

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
0007017

Ustanove
Geodetski fakultet, Zagreb

Profili:

Avatar Url Bojan Vršnak (autor)

Citiraj ovu publikaciju

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 (međunarodna recenzija, članak, znanstveni)
Vršnak, B., Temmer, M., Veronig, A., Karlicky, M. & Lin, J. (2006) Shrinking and Cooling of Flare Loops in a Two-Ribbon Flare. Solar Physics, 234, 273-299.
@article{article, year = {2006}, pages = {273-299}, keywords = {Sun\v{c}evi bljeskovi}, journal = {Solar Physics}, volume = {234}, issn = {0038-0938}, title = {Shrinking and Cooling of Flare Loops in a Two-Ribbon Flare}, keyword = {Sun\v{c}evi bljeskovi} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


Uključenost u ostale bibliografske baze podataka:


  • NASA-ADS