On the origin of solar white-light flares

Details On the origin of solar white-light flares On the origin of solar white-light flares

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...354..691g&link_type=abstract

Astronomy and Astrophysics, v.354, p.691-696 (2000)

Astronomy and Astrophysics

Astrophysics

5

Sun: Flares, Sun: Chromosphere, Sun: Photosphere, Sun: X-Rays, Gamma Rays

Scientific paper

Using the Hα line intensity as a constraint, we study the role of a chromospheric condensation and the role of non-thermal effects in producing the continuum enhancement of white-light flares. Within an acceptable range of Hα line intensities and electron energy flux, it is shown that neither a chromospheric condensation nor non-thermal effects alone can directly explain the observed continuum enhancement. The hybrid role of both chromospheric condensation and non-thermal effects can only lead to a Balmer jump, but still not to a significant continuum intensity increase between 4000 and 7000 Ä. A possible picture is discussed, that is, the Balmer jump is directly produced by the association of a chromospheric condensation and of non-thermal effects, while the continuum enhancement between 4000 and 7000 Ä, is indirectly produced by the condensation and the non-thermal effects via radiative heating to the deeper photospheric layers.

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