Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...352l..99t&link_type=abstract
Astronomy and Astrophysics, v.352, p.L99-L102 (1999)
Astronomy and Astrophysics
Astrophysics
29
Magnetohydrodynamics (Mhd), Line: Profiles, Sun: Activity, Sun: Corona, Sun: Transition Region, Sun: Uv Radiation
Scientific paper
We explore the idea that the occurrence of nano-flares in a magnetic loop around the O vi formation temperature could explain the observed red-shift of mid-low transition region lines as well as the blue-shift observed in low coronal lines (T > 6x 105\ K). Observations are compared to numerical simulations of the response of the solar atmosphere to an energy perturbation of 4x 1024 ergs representing an energy release during magnetic reconnection in a 1-D semi-circular flux tube. The temporal evolution of the thermodynamic state of the loop is converted into C iv 1548, O vi 1032 and Ne viii 770 line profiles in non-equilibrium ionization. Performing an integration over the entire period of simulations, a redshift of ~ 6\ km\ s-1 is found in C iv, while a blue-shift of ~ 2\ km\ s-1 and ~ 10\ km\ s-1 were derived for O vi and Ne viii, respectively, in reasonable agreement with observations.
Doyle Gerry J.
Erdelyi Robert
Sarro Luis M.
Teriaca Luca
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