Abstract
We present unique NUV observations of a well-observed X-class flare from NOAA 12087 obtained at Ond\v{r}ejov Observatory. The flare shows a strong white-light continuum but no detectable emission in the higher Balmer and Lyman lines. RHESSI and Fermi observations indicate an extremely hard X-ray spectrum and gamma-ray emission. We use the RADYN radiative hydrodynamic code to perform two type of simulations. One where an energy of 3 x 10^11 erg/cm^2/s is deposited by an electron beam with a spectral index of ~3 and a second where the same energy is applied directly to the photosphere. The combination of observations and simulations allow us to conclude that the white-light emission and the suppression or complete lack of hydrogen emission lines is best explained by a model where the dominant energy deposition layer is located in the lower layers of the solar atmosphere rather than the chromosphere.
Original language | English |
---|---|
Pages (from-to) | 46-54 |
Journal | The Astrophysical Journal |
Volume | 837 |
Issue number | 1 |
DOIs | |
Publication status | Published - 01 Mar 2017 |
Bibliographical note
13 pagesKeywords
- WHITE-LIGHT FLARES
- SPECTROSCOPY
- HYDROGEN LINES
- Modeling
Fingerprint
Dive into the research topics of 'Suppression of Hydrogen Emission in an X-Class White-Light Solar Flare'. Together they form a unique fingerprint.Student Theses
-
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
File