Abstract
Observations of an X1 class WL solar flare on 2014 June 11 showed a surprisingly weak emission in both higher order Balmer and Lyman lines and continua. The flare was observed by RHESSI but low energy cut-off of non-thermal component was indeterminable due to the unusually hard electron spectrum (delta = 3). An estimate of power in non-thermal electron beams together with an area of WL emission observed by HMI yielded to an upper and lower estimate of flux 1E9 and 3E10 erg/cm2/s, respectively. We performed a grid of models using a radiative hydrodynamic code RADYN in order to compare synthetic spectra with observations. For low energy cut-off we chose a range from 20 to 120 keV with a step of 20 keV and delta parameter equal to 3. Electron beam-driven models show that higher low energy cut-off is more likely to produce an absorption Balmer line profile, if the total energy flux remains relatively low. On the other hand a detectable rise of HMI continuum (617 nm) lays a lower limit on the beam flux. Proton beam-driven models with equivalent fluxes indicate a greater penetration depth, while the Balmer lines reveal significantly weaker emission. Atmospheric temperature profiles show that for higher values of low energy cut-off the energy of the beam is deposited lower in chromosphere or even in temperature minimum region. This finding suggests, that suppressed hydrogen emission can indicate a formation of white-light continuum below chromosphere.
Original language | English |
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DOIs | |
Publication status | Published - 14 Dec 2017 |
Event | AGU Fall meeting 2017 - New Orleans, United States Duration: 11 Dec 2017 → 15 Dec 2017 |
Conference
Conference | AGU Fall meeting 2017 |
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Country/Territory | United States |
City | New Orleans |
Period | 11/12/2017 → 15/12/2017 |
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Dive into the research topics of 'Modelling of Electron and Proton Beams in a White-light Solar Flare'. Together they form a unique fingerprint.Student theses
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Analysis and Modelling of a Type II White-light Solar Flare
Author: Procházka, O., 2019Supervisor: Mathioudakis, M. (External person) (Supervisor)
Student thesis: Doctoral Thesis › Doctor of Philosophy
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