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Solar Flare Chromospheric Line Emission: Comparison Between IBIS High-resolution Observations and Radiative Hydrodynamic Simulations View all abstracts by submitter

Fatima Rubio da Costa   Submitted: 2014-12-04 13:56

Solar flares involve impulsive energy release, which results in enhanced radiation in a broad spectral and at a wide height range. In particular, line emission from the chromosphere (lower atmosphere) can provide critical diagnostics of plasma heating processes. Thus, a direct comparison between high-resolution spectroscopic observations and advanced numerical modeling results can be extremely valuable, but has not been attempted so far. We present in this paper such a self-consistent investigation of an M3.0 flare observed by the Dunn Solar Telescope's (DST) Interferometric Bi-dimensional Spectrometer (IBIS) on 2011 September 24 that we have modeled with the radiative hydrodynamic code RADYN (Carlsson & Stein 1992, 1997; Abbett & Hawley 1999; Allred et al. 2005). We obtained images and spectra of the flaring region with IBIS in Hα 6563 Å and Ca II 8542 Å, and with the Reuven Ramaty High Energy Solar Spectroscope Imager (RHESSI)in X-rays. The latter was used to infer the non-thermal electron population, which was passed to RADYN to simulate the atmospheric response to electron collisional heating. We then synthesized spectral lines and compared their shapes and intensities with those observed by IBIS and found that they exhibit an agreement in general. In particular, the synthetic Ca II 8542 Å profile fits well to the observed profile, while the synthetic Hα profile is fainter in the core than the observation. This indicates that Hα emission is more responsive to the non-thermal electron flux than the Ca II 8542 Å emission. We suggest that a refinement of the energy input and other processes is necessary to resolve this discrepancy.

Authors: Fatima Rubio da Costa, Lucia Kleint, Vahé Petrosian, Alberto Sainz Dalda, Wei Liu
Projects: None

Publication Status: submitted
Last Modified: 2014-12-05 13:41
Go to main E-Print page  DIRECT OBSERVATIONS OF TETHER-CUTTING RECONNECTION DURING A MAJOR SOLAR EVENT FROM 2014 FEBRUARY 24 TO 25  Magnetic reconnection between small-scale loops observed with the New Vacuum Solar Telescope  Edit Entry  Download Preprint  Delete Entry 

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