X-ray and radio emission and the relativistic proton profile of the 2005 Jan. 20 event. From bottom to top: a) soft X-rays λ = 0.1−0.8 nm (dark line) and 0.05−0.4 nm (light; red in the colour plot of the online version); b) microwaves (dark line 2.7 GHz, light – red in the colour display – a combination of 17 GHz (NoRP) before and 15.4 GHz (LEAR) after 06:55 UT); c) dynamic radio spectrum at dm-m waves (ARTEMIS-IV; inverse colour scale; 1 s integration time); d) decametre-kilometre wave radio emission (Wind/WAVES; inverse colour scale; 1 min integration); e) proton flux time history at 2 GV (dark curve) and 5 GV (light curve; red in the online version) rigidity (kinetic energy 1.27 and 4.15 GeV, respectivelyy), time axis shifted back by 216 s. The intervals delimited by vertical lines and numbered 0 to 6 are different episodes of particle acceleration, as discussed in the text.