2004/02/11 by D. Tsiklauri, M. J. Aschwanden, V. M. Nakariakov +1 · 24 citations
Energy · Physics and Astronomy · #Apex (geometry) #Electron #Electron temperature #Flare #Ionosphere and magnetosphere dynamics #Oil, Gas, and Environmental Issues #Parameter space #Radiative transfer #Solar and Space Plasma Dynamics #Solar flare #Thermal #Viscosity #astro-ph
paper · pdf · doi:10.1051/0004-6361:20041088-1
published in Astronomy and Astrophysics 419(3), 1149-1158 (EDP Sciences)
arxiv created 2004/02/11 · openalex publication_date 2004/05/07 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A 1D loop radiative hydrodynamic model that incorporates the effects of gravitational stratification, heat conduction, radiative losses, external heat input, presence of helium, and Braginskii viscosity is used to simulate elementary flare loops. The physical parameters for the input are taken from observations of the Bastille-Day flare of 2000 July 14. The present analysis shows that: a) the obtained maximum values of the electron density can be considerably higher (4.2 1011 cm-3 or more) in the case of footpoint heating than in the case of apex heating (2.5 1011 cm-3); b) the average cooling time after the flare peak takes less time in the case of footpoint heating than in the case of apex heating; c) the peak apex temperatures are significantly lower (by about 10 MK) for the case of footpoint heating than for apex heating (for the same average loop temperature of about 30 MK). This characteristic would allow to discriminate between different heating positioning; d) in both cases (of apex and footpoint heating), the maximum obtained apex temperature is practically independent of the heating duration , but scales directly with the heating rate ; e) the maximum obtained densities at the loop apex, , increase with the heating rate and heating duration for both footpoint and apex heating. In Paper II we will use the outputs of these hydrodynamic simulations, which cover a wide range of the parameter space of heating rates and durations, as an input for forward-fitting of the multi-loop arcade of the Bastille-day flare.