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Astronomy & Astrophysics manuscript no. (will be inserted by hand later)

Summary: Astronomy & Astrophysics manuscript no.
(will be inserted by hand later)
Magnetic reconnection in 2D stratified atmospheres
Part II. Observational consequences
Ilia Roussev 1;2 and Klaus Galsgaard 3
1 High Altitude Observatory, NCAR, 3450 Mitchell Lane, Boulder, CO 80301, USA; e­mail: ilr@ucar.edu
2 Armagh Observatory, College Hill, Armagh, BT61 9DG, N. Ireland;
3 University of St. Andrews, School of Mathematics and Statistics, North Haugh, St. Andrews, Fife, KY16 9SS,
Scotland; e­mail: klaus@mcs.st­and.ac.uk
Received date, accepted date
Abstract. We synthesise three resonance transitions of Li­like ions, C iv 1548.2 š A, O vi 1031.9 š A, and Ne viii
770.4 š A, based on the MHD experiments presented in Part I of this study. Part I involved 2D MHD modelling
of magnetic reconnection events in stratified magneto­hydrostatic atmospheres selected to represent a `quiet' Sun
transition region environment. Here in Part II, we discuss some observable consequences of these simulations by
including effects of non­equilibrium ionization in a 1D approximation. All spectral line syntheses are done along a
particular ray, oriented vertically along the initial current structure. Computed time­series, in the three spectral
lines, reveal both blue­ and red­shifted Doppler components. It is found to be easier to detect the reconnection
event in the various emission lines as strongly Doppler­shifted components as the stratification increases. We
predict what the observational consequences of these reconnection events would be, if various spatial resolutions
under 1 arcsec become available in future observations. This work is a continuation of previous numerical studies


Source: Armagh Observatory


Collections: Physics