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We present lightcurves obtained in X-ray by the XMM-Newton EPIC cameras andsimultaneous radio lightcurves obtained with the VLA for five active M-typeflare stars. A number of flare events were observed, and by comparing radiowith X-ray data, we consider various possible flare mechanisms. In cases wherethere seems to be a clear correlation between radio and X-ray activity, we usean energy budget argument to show that the heating which leads to the X-rayemission could be due to the same particles emitting in the radio. In caseswhere there is radio activity without corresponding X-ray activity, we arguethat the radio emission is likely to arise from coherent processes involvingcomparatively few particles. In one case, we are able to show from polarizationof the radio emission that this is almost certainly the case. Cases for whichX-ray activity is seen without corresponding radio activity are more difficultto explain. We suggest that the heating particles may be accelerated to veryhigh energy, and the resulting synchrotron radio emission may be beamed indirections other than the line of sight.Comment: 12 pages, 10 figure

Flares observed with XMM-Newton and the VLA