Limb emission lines near solar H and K: ?? 3900 to 4000 �
نویسندگان
چکیده
منابع مشابه
Mg II h + k emission lines as stellar activity indicators of main sequence F - K stars
Context. The largest dataset of stellar activity measurements available at present is the one obtained at the Mount Wilson Observatory, where high-precision Ca II H+K fluxes have been measured from 1966 for about 2200 stars. Since the Mg II h and k lines at λ2800 Å are formed in a similar way to the Ca II H+K emission lines, they are also good indicators of chromospheric structure. The Internat...
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Previously, large discrepancies have been found between theory and observation for Fe emission line ratios in solar flare spectra covering the 224–327 Å wavelength range, obtained by the Naval Research Laboratory’s S082A instrument on board Skylab. These discrepancies have been attributed to either errors in the adopted atomic data or the presence of additional atomic processes not included ...
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Line widths derived from observational data obtained by SUMER onboard SOHO in August 1996 at disk center and at the limb are used to confront those derived via assuming Alfvén and/or magneto-acoustic wave heating. The observational data clearly shows a center-to-limb variation in the upper chromospheric and transition region lines, with only a marginal difference in the coronal lines in the sen...
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ژورنال
عنوان ژورنال: Solar Physics
سال: 1973
ISSN: 0038-0938,1573-093X
DOI: 10.1007/bf00152377