منابع مشابه
Prominences on Late Type Active Stars
There is increasing evidence of prominence-like neutral hydrogen clouds suspended in the otherwise hot coronae of active late-type stars. We review this evidence here and discuss the nature of these clouds. In particular we discuss their possible role in rotational braking.
متن کاملMagnetic Dips in Prominences
Magnetic dips are generally assumed to be basic equilibrium con-gurations in quiescent solar prominences. Here we discuss two types of the magnetic dips which were considered in the literature: (1) dips resulting from a force-free magnetic equilibrium in the corona, and (2) magnetic dips which are formed in situations where the Lorentz force balances the weight of the prominence plasma. An impo...
متن کاملThe Helium spectrum in erupting solar prominences
Even quiescent solar prominences may become active and sometimes erupt. These events are occasionally linked to coronal mass ejections. However we know very little about the plasma properties during the activation and eruption processes. We present new computations of the helium line profiles emitted by an eruptive prominence. The prominence is modelled as a plane-parallel slab standing vertica...
متن کاملSubsurface Circulations within Active Regions
Using high-resolution ring analysis (HRRA) we deduce subsurface flows within magnetic active regions and within quiet sun. With this procedure we are capable of measuring flows with a horizontal spatial resolution of 2◦ in heliographic angle (or roughly 20 Mm). From the resulting flow fields we deduce mean inflow rates into active regions, mean circulation speeds around active regions, and prob...
متن کاملGeodesic Active Regions for Tracking
In this paper we propose some new ideas for tracking multiple moving objects by the propagation of curves. We assume a static observer, as well as the existence of a background reference frame. The tracking is performed using an improved Geodesic Active Contour model that incorporates boundary-based and region-based motion information. This model is called a Geodesic Active Region model. Initia...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1968
ISSN: 0074-1809
DOI: 10.1017/s0074180900021653