منابع مشابه
The signature of chromospheric heating in Ca II H spectra
Context. The heating process that balances the solar chromospheric energy losses has not yet been determined. Conflicting views exist on the source of the energy and the influence of photospheric magnetic fields on chromospheric heating. Aims. We analyze a 1-hour time series of cospatial Ca II H intensity spectra and photospheric polarimetric spectra around 630 nm to derive the signature of the...
متن کاملChromospheric Flares
In this topical review I revisit the “chromospheric flare”. This should currently be an outdated concept, because modern data seem to rule out the possiblity of a major flare happening independently in the chromosphere alone, but the chromosphere still plays a major observational role in many ways. It is the source of the bulk of a flare’s radiant energy – in particular the visible/UV continuum...
متن کاملChromospheric Oscillations
We show results from NSO/Sacramento Peak data to discuss three issues: (i)—the spatial occurrence of chromospheric 3–min oscillations; (ii)—the validity of Ca II H&K line-center Doppler Shift measurements; (iii)—the significance of oscillation power and phase at frequencies above 10 mHz.
متن کاملSearching for chromospheric Lyman-α emission in A–F stars from IUE high resolution spectra
With the aim of locating the boundary for the onset of chromospheric emission in the H-R diagram we have undertaken a spectroscopic study of the hydrogen Ly-α, using the IUE short wavelength spectrograph in the high resolution mode. We report here on the analysis of IUE spectra of 11 A–F type stars. We have detectedLy-α emission in stars as early asA7 (B–V = 0.19), establishing a new limit for ...
متن کاملChromospheric Fine Structure Didactically
The solar chromosphere is occupied with a wealth of fine structures referred to by diverse nomenclature. Recent identification of slow-mode magnetoacoustic shocks, excited by p-modes of photospheric oscillations, as plausible drivers of dynamic fibrils and spicules was followed by a surge of observational studies and numerical simulations attempting to reveal the role of chromospheric fine stru...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 1957
ISSN: 0004-6256
DOI: 10.1086/107626