Summary: PROMINENCES ON LATE TYPE ACTIVE STARS
Armagh BT61 9DG, N. Ireland
Abstract. There is increasing evidence of prominencelike neutral hydro
gen clouds suspended in the otherwise hot coronae of active latetype stars.
We review this evidence here and discuss the nature of these clouds. In
particular we discuss their possible role in rotational braking.
The solar paradigm is widely used to explain a broad range of phenomena on
latetype stars. These include stellar flares, sudden brightenings in broad
band radiation, from microwaves to hard Xrays (analogous to solar flares),
modulation of global visible and nearIR light by the varying visibility of
dark areas on the stellar surface as the underlying star rotates (``starspots'',
analogous to sunspots), and nonradiative heating of hot chromospheres
and coronae. All of these phenomena arise from powerful magnetic fields,
generated by the interaction of differential rotation and deep convection,
and intensified locally into loop structures at the photosphere and above,
in a manner familiar on the Sun.
Studying stellar counterparts of solar magnetic activity offers us many