''Coronae'' of rotating interstellar clouds

In this Letter, we cconsider differential rotation of cool interstellar clouds in the presence of internal magnetic fields, and show that because of the relative ineffectiveness of field dissipation within the clouds, magnetized gas experiences buoyant forces. The resulting field loops emerge from the cloud, and dissipate their energy by field reconnection. The consequent heating is sufficient to produce relatively hote (Tapprox. =104 K) ''coronae'' about the clouds