Characterization of intensity variations along FeXIV coronal loops. A case study

COSTA, ANDREA, STENBORG, GUILLERMO

SOLAR PHYSICS

SPRINGER

Año: 2004 vol. 222 p. 229 - 245

0038-0938

Abstract. We discuss a method, and corresponding results, in order to analyze the dynamics of localized small scale coronal (postflaring) loops observed with the MICA (Mirror Coronagraph for Argentina) telescope in the well known green coronal line at 530.3 nm. In particular, we designed a procedure to measure intensity variations along the structure of a loop, both in space and time. The method was applied to a loop on the south-west limb on green line images taken on October 1st, 2001 with a cadence of about one per minute. Significant coronal variability was detected in a compact loop system suggesting different types of plasma fow. One of them shows a brightening at the top, which moves down along the axis of the loop with mean velocities that suggest scenarios of high-speed plasma fows. The results obtained allow the fow inside coronal structures to be characterized and theoretical descriptions related to different physical scenarios to be compared.We discuss a method, and corresponding results, in order to analyze the dynamics of localized small scale coronal (postflaring) loops observed with the MICA (Mirror Coronagraph for Argentina) telescope in the well known green coronal line at 530.3 nm. In particular, we designed a procedure to measure intensity variations along the structure of a loop, both in space and time. The method was applied to a loop on the south-west limb on green line images taken on October 1st, 2001 with a cadence of about one per minute. Significant coronal variability was detected in a compact loop system suggesting different types of plasma fow. One of them shows a brightening at the top, which moves down along the axis of the loop with mean velocities that suggest scenarios of high-speed plasma fows. The results obtained allow the fow inside coronal structures to be characterized and theoretical descriptions related to different physical scenarios to be compared. Keywords: Solar Corona { Fe XIV line { Post are loopsSolar Corona { Fe XIV line { Post are loops