The nature of magnetic activity at the low-mass end of the main-sequence

We propose for XMMNewton observations of 5 carefully selected ultracool dwarfs,jointly with the EVLA and Halpha monitoring, to systematically investigatemagnetic activity in lateM dwarfs. Our targets are nearby (<20 pc), known tomaintain magnetic fields (direct field detections), they yield evidence forchromospheres (Halpha emission) and have known rotation rate (v sini). This willallow us to study the connection between chromospheric and coronal activity,their relation with rotation, and possibly study the dynamics of flares at thebottom of the mainsequence. This proposal has been downscaled from an LPsubmitted to AO10 in order to accomodate the TAC request to make the multiwavelength observations simultaneous which would be unfeasible for a much larger sample. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]