We discuss the problem of a limiting height of quiescent prominences
and the relation of this value to the photospheric magnetic field characteristics.
In some papers the limiting height is assumed to be related to the strength
of the magnetic field or its horizontal gradient. We note that in a model
of inverse polarity filament, the equilibrium is stable only in the region
where the photospheric magnetic field falls off with a height not faster
than 1/h. Current-free magnetic field calculations are compared with the
observed prominence heights. It is shown that a prominence height is in
fact depends on the vertical gradient value and never exceeds the level
where the power is equal to one in the power-low decrease of the magnetic
field. This is a new way to predict prominence eruptions and CME.
Authors: B.P. Filippov, O.G. Den.
Organization: Institute of Terrestrial Magnetism, Ionosphere
and
Radio Wave Propagation, Russian
Academy of Sciences
Telephone: 7 095 334 0284
Fax: 7
095 334 0124
e-mail: bfilip@
Address: IZMIRAN, Troitsk Moscow
Region, 142092, Russia