High-resolution observations of multiwavelength emissions during two X-class white-light flares

Yan Xu, Wenda Cao, Chang Liu, Guo Yang, Ju Jing, Carsten Denker, A. Gordon Emslie, Haimin Wang

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55 Scopus citations


We observed two X-class white-light flares (WLFs) on 2003 October 29 (∼20:40 UT) and November 2 (∼17:16 UT) using the Dunn Solar Telescope (DST) and its High-Order Adaptive Optics (HOAO) system in several wavelengths. The spatial resolution was close to the diffraction limit of DST's 76 cm aperture, and the cadence was as high as 2 s. This is the first time that WLFs have been observed in the near-infrared (NIR) wavelength region. We present a detailed study in this paper comparing photospheric continuum observations during the two events with corresponding line-of-sight magnetograms from the Solar and Heliospheric Observatory (SOHO) Michelson Doppler Imager (MDI) and hard X-ray (HXR) data from the Ramaty High-Energy Solar Spectroscopic Imager (RHESSI). We also discuss several models that provide possible mechanisms to explain these continuum enhancements, especially in the NIR.

Original languageEnglish (US)
Pages (from-to)1210-1216
Number of pages7
JournalAstrophysical Journal
Issue number2 I
StatePublished - Apr 20 2006

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Sun: activity
  • Sun: flares
  • Sun: photosphere


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