Stellar X-ray emission as an indicator of stellar magnetic activity

An overview of recent Einstein Observatory observations and theoretical modeling of stellar X-ray emission is presented, with particular emphasis upon the role such studies can play furthering our understanding of stellar magnetic activity. Recent analyses of stellar X-ray observations from the Einstein Observatory have focused on the interpretation of stellar coronal emission and possibly-related surface magnetic activity within the framework of our understanding of solar activity; including 'loop' models of stellar coronae, observations of coronal emission variability on a wide range of time scales (which provide information on the morphology of the emitting plasma), and observations and modeling of low-resolution spectroscopic X-ray observations (which test the applicability of solar modeling). These recent results all reinforce the argument that stellar coronal emission constitutes an excellent probe for studying stellar magnetic activity over a wide dynamic range, one which may prove to be uniquely suited to studying such activity in distant (and hence faint) sources. (Auth.)