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[abridged] We describe the results of our multi-wavelength observing campaignon the young stellar objects in the LkH$\alpha$101 cluster. Our simultaneousX-ray and multi-frequency radio observations are unique in providingsimultaneous constraints on short-timescale variability at both wavelengths aswell as constraints on the thermal or nonthermal nature of radio emission fromyoung stars. Focussing in on radio-emitting objects and the multi-wavelengthdata obtained for them, we find that multi-frequency radio data indicatenonthermal emission even in objects with infrared evidence for disks. We findradio variability on timescales of decades, days and hours. About half of theobjects with X-ray and radio detections were variable at X-ray wavelengths,despite lacking large-scale flares or large variations. Variability appears tobe a bigger factor affecting radio emission than X-ray emission. A star withinfrared evidence for a disk, [BW88]~3, was observed in the decay phase of aradio flare. In this object and another ([BW88]~1), we find an inversecorrelation between radio flux and spectral index which contrasts with behaviorseen in the Sun and active stars. We interpret this behavior as therepopulation of the hardest energy electrons due to particle acceleration. Aradio and X-ray source lacking an infrared counterpart, [BW88]~1, may be nearthe substellar limit; its radio properties are similar to other clustermembers, but its much higher radio to X-ray luminosity ratio is reminiscent ofbehavior in nearby very low mass stars/brown dwarfs. We find no correspondencebetween signatures of particle acceleration and those of plasma heating, bothtime-averaged and time-variable. The lack of correlated temporal variability inmulti-wavelength behavior, the breakdown of multi-wavelength correlations of...

Multiwavelength Signatures of Magnetic Activity from Young Stellar Objects in the LkH\alpha101 Cluster