منابع مشابه
Modeling the Solar Chromosphere
Spectral diagnostic features formed in the solar chromosphere are few and difficult to interpret — they are neither formed in the optically thin regime nor in local thermodynamic equilibrium (LTE). To probe the state of the chromosphere, both from observations and theory, it is therefore necessary with modeling. I discuss both traditional semi-empirical modeling, numerical experiments illustrat...
متن کاملThe prolate solar chromosphere
We present a comparative analysis of the chromospheric solar limb prolateness, using strictly simultaneous Hα ground-based observations and HeII space-based observations. The typical prolateness is found to be ∆D/D = 5.5 × 10−3 in HeII and 1.2 × 10−3 in Hα. The first measurements in the 30.4 nm HeII line over a period of two years, as well as coronal data, are discussed to explore further the o...
متن کاملThe Non-magnetic Solar Chromosphere
We summarizerecent results from self-consistent non-LTE radiation hydrodynamicssimulations of the propagation of acoustic waves through the non-magnetic solar chromosphere. References to more detailed write-ups of the work are given. The simulations closely match the observed behaviour of Ca II H 2 V bright grains. Observations of CO-lines, that are problematicto explain in semi-empiricalone-co...
متن کاملOn the Nature of the Solar Chromosphere
DOT high-resolution imagery suggests that only internetworkspanning Hα “mottles” constitute the quiet-sun chromosphere, whereas more upright network “straws” in “hedge rows” reflect transition-region conditions.
متن کاملGeneration of Flows in the Solar Chromosphere Due to Magnetofluid Coupling
It is shown that a generalized magneto–Bernoulli mechanism can effectively generate high velocity flows in the Solar chromosphere by transforming the plasma pressure energy into kinetic energy. It is found that at reasonable heights and for realistic plasma parameters, there is a precipitous pressure fall accompanied by a sharp amplification of the flow speed. Subject headings: Sun: atmosphere ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2017
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201630082