Prominence fine structures in a magnetic equilibrium. II. A grid of two-dimensional models

Details Prominence fine structures in a magnetic equilibrium. II. A grid of two-dimensional models Prominence fine structures in a magnetic equilibrium. II. A grid of two-dimensional models

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...442..331h&link_type=abstract

Astronomy and Astrophysics, Volume 442, Issue 1, October IV 2005, pp.331-343

Astronomy and Astrophysics

Astrophysics

30

Sun: Prominences, Magnetohydrodynamics (Mhd), Radiative Transfer, Line: Profiles

Scientific paper

We construct a grid of 2D vertical-thread models for prominence fine structures which are in magnetohydrostatic (MHS) equilibrium. Such thread models have been described in a previous paper by Heinzel & Anzer (2001), but here we use a modified 2D transfer code with an adaptive MHS grid. Multilevel non-LTE transfer calculations are now performed for a 12-level plus continuum hydrogen model atom, in order to study the behaviour of the Lyman-series lines observed by SOHO/SUMER. Our grid consists of 18 models which cover a range of central column masses, magnetic-field intensities and two parameters characterising the 2D temperature structure of the thread. Since different Lyman lines and their parts (line center, peak, wings) are formed at different places within the thread, the Lyman series may serve as a good diagnostic tool for thermodynamic conditions varying from central cool parts to a prominence-corona transition region. We demonstrate this behaviour for various lines, showing their synthetic profiles as seen from two perpendicular directions along and across the magnetic field lines, respectively, and displaying the respective contribution functions. This study confirms our earlier conclusion that the Lyman line profiles are much more reversed when seen across the field lines, compared to those seen along the lines. The latter can be even unreversed. We also show the geometrical cross-section (shape) of all 18 models. Their thread-like shape with a considerable aspect ratio resembles recent high-resolution Hα images. Finally, we discuss the relation of our thread models to the vertical threads studied by Fontenla et al. (1996, ApJ, 466, 496).

Affiliated with

Also associated with

No associations

Rating

Prominence fine structures in a magnetic equilibrium. II. A grid of two-dimensional models does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Prominence fine structures in a magnetic equilibrium. II. A grid of two-dimensional models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Prominence fine structures in a magnetic equilibrium. II. A grid of two-dimensional models will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1617650