منابع مشابه
Formation of helium spectrum in solar quiescent prominences
We present new non-LTE modelling of the helium spectrum emitted by quiescent solar prominences. The calculations are made in the frame of a one-dimensional plane-parallel slab. The physical parameters of our models are the electron temperature, the gas pressure, the slab width, the microturbulent velocity and the height above the solar surface. In this paper, we present isothermal isobaric mode...
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 کاملThe radio spectrum of a quiescent stellar mass black hole
Observations of V404 Cyg performed with the Westerbork Synthesis Radio Telescope at four frequencies, over the interval 1.4−8.4 GHz, have provided us with the first broadband radio spectrum of a ‘quiescent’ stellar mass black hole. The measured mean flux density is of 0.35 mJy, with a spectral index α = +0.09±0.19 (such that Sν ∝ ν). Synchrotron emission from an inhomogeneous partially self-abs...
متن کاملThe Fine Structure of Solar Prominences
Solar prominences and filaments (prominences projected against the solar disk) exhibit a large variety of fine structures which are well observed down to the resolution limit of ground-based telescopes. We describe the morphological aspects of these fine structures which basically depend on the type of a prominence (quiescent or active-region). Then we review current theoretical scenarios which...
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...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1956
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/116.6.699