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We present first results of a four-epoch VLBA survey for nonthermal emissiontoward all 556 compact radio sources previously identified in a deep VLA surveyof the Orion Nebula Cluster (ONC). We identify VLBA counterparts toward anunprecedented 123 sources. Of these, 41 do not have X-ray counterparts, ofwhich 34 also do not display near-infrared counterparts. Since these cannot beexplained by extragalactic background sources, this suggests a component of theONC population of young stellar objects that are too deeply embedded for evenX-rays to be detectable. We find pervasive variability and detect even most ofthe highest-S/N sources in only one out of four epochs. Neither a negativespectral index nor extreme variability in the VLA data is a good predictor of aVLBA detection.

A VLBA Survey of radio stars in the Orion Nebula Cluster: I. The nonthermal radio population