  Flares we observe on stars in white light, UV or soft X-rays are probably
harbingers of coronal mass ejections (CMEs). If we use the Sun as a guide,
large stellar flares will dissipate two orders of magnitude less X-ray
radiative energy than the kinetic energy in the associated CME. Since coronal
emission on active stars appears to be dominated by flare activity, CMEs pose a
quandary for understanding the fraction of their energy budget stars can spend
on magnetic activity. One answer is magnetic suppression of CMEs, in which the
strong large-scale fields of active stars entrap and prevent CMEs unless their
free energy exceeds a critical value. The CME-less flaring active region NOAA
2192 presents a possible solar analogue of this. Monster CMEs will still exist,
and have the potential to ravage planetary atmospheres.
