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The flare activity and the ultraviolet emission of the sun during its 24-thcycle are analysed. As compared to cycles 21-23, where the most powerful flareswere observed during the decay phase, in cycle 24 the greatest number ofpowerful flares (>X2.7) occurred in the rising phase and at the maximum withthe exception of the two largest flares of cycle 24 X9.3 and X8.2 in September2017. We showed that regression fits of solar UV indices to the overallradiation level from the sun are substantially different for cycle 24 comparedto cycles 21-23. It is found that for the flare of August 9, 2011 (SDO andGOES-15 observations), the flare propagates in a direction from the uppercorona to the transition region and to the chromosphere. A study of the N-Sasymmetry in the distribution of the flares in cycle 24 reveals a strongpredominance of flares in the N-hemisphere in 2011 and in the S-hemisphere in2014. It is also found that during cycles 23 and 24, the delays in the onset ofproton events relative to the onset of the flares that cause them have adistribution with a distinct maximum corresponding to a delay of 2 hours forprotons with energies >10 MeV, as well as for those with energies >100 MeV.

Flare activity of the Sun and variations in its UV emission during cyrcle 24