Characterization of intensity and spatial variations along coronal loops. II. A TRACE case study

Details Characterization of intensity and spatial variations along coronal loops. II. A TRACE case study Characterization of intensity and spatial variations along coronal loops. II. A TRACE case study

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...441..327b&link_type=abstract

Astronomy and Astrophysics, Volume 441, Issue 1, October I 2005, pp.327-335

Astronomy and Astrophysics

Astrophysics

4

Sun: Corona, Waves, Sun: Magnetic Fields, Instabilities

Scientific paper

We describe dynamical features and evolutionary characteristics of brightening coronal loops. We describe intensity variations, both in space and time, along a coarse grain loop structure, confirming high speed velocity scenarios. We apply the method to TRACE space-born images that show a compound of several magnetic threads. MICA ground-based images display a unique non-resolved loop structure. We confirm that a coherent behavior of the intensity along neighboring magnetic tubes occurs, i.e. we obtain a similar pattern from both telescopes: each has two branches, suggesting the sliding down of plasma in both directions from a given position on the loop structure. The apparent sliding down occurs in approximately 12 min. After the first appearance, TRACE registers two reiterations of the phenomenon suggesting a wave-based explanation. The feasibility of wave-based and flow-based models is analyzed. In either case, in order to explain the coherent coronal behavior the scenario of apparently non-interacting coronal threads requires theoretical explanations that consider uniform chromospheric conditions covering the footpoints of all the related magnetic tubes. We suggest a characteristic longitude of coherence.

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