Study of a transient siphon flow in a cold loop

Y. Taroyan*, J. G. Doyle, B. Ishak, M. S. Madjarska, S. J. Bradshaw

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Proceeding (Non-Journal item)

Abstract

We report on joint SUMER and TRACE observations of a transient event which occurred in a cold loop, lasting a few minutes. The measurements were taken on 1999 June 3 between 09:18 UT and 11:08 UT. A sequence of TRACE images in the 1550 Å and 171 A filters show a disturbance which originates at one foot-point and propagates along the loop. The SUMER slit is placed at the other foot-point of the loop. During the event an intensity increase and a red shift of about 30 km s-1 was detected in the N V 1238.82 Å line. ID numerical simulations are performed and observable quantities derived from the results of the simulations. The observed dynamic behaviour of the N V 1238.82 Å line profiles is recovered. These results suggest that the observations could be interpreted in terms of a short-lived siphon flow reaching a speed of 110 km s-1 and driven by a nonlinear heating pulse. The energies required to drive the observed red-shifts are estimated to be 1024 erg. The absence of a significant blueshift caused by the return flow is explained.

Original languageEnglish
Title of host publication11th European Solar Physics Meeting - The Dynamic Sun:
Subtitle of host publicationChallenges for Theory and Observations
Pages649-654
Number of pages6
Edition600
Publication statusPublished - 2005
Event11th European Solar Physics Meeting - The Dynamic Sun: Challenges for Theory and Observations - Leuven, Belgium
Duration: 11 Sept 200516 Nov 2005

Publication series

NameEuropean Space Agency, (Special Publication) ESA SP
ISSN (Print)0379-6566

Conference

Conference11th European Solar Physics Meeting - The Dynamic Sun: Challenges for Theory and Observations
Country/TerritoryBelgium
CityLeuven
Period11 Sept 200516 Nov 2005

Keywords

  • Hydrodynamics
  • Line: profiles
  • Methods: numerical
  • Methods: observational
  • Sun: corona
  • Sun: transition region

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