GOES X-ray flux recorded on September 13, 2005. The flare numbers, adapted from Liu et al. (2009), are indicated with capital roman numbers. The second flare is not discernible in the soft X-ray flux. The SOLIS-VSM observation time from 19:36 UT to 20:57 UT is represented by the red solid line. MDI, recording magnetograms in Ni i 676.77 nm, and the RHESSI observing times are indicated with green dashed-dotted and blue dashed lines, respectively.