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- W2127887714 abstract "High resolution Stokes-I spectra of the Zeeman- sensitive lines at 846.85 nm and 630.25 nm were used to determine the magnetic eld strength and the brightness tem- perature of a simple, relatively symmetric sunspot umbra and its umbral dots (UDs). We nd a decrease in brightness temperature for central (30 %) and peripheral UDs (20-25 %) compared to the sur- rounding quiet sun. This corresponds to a difference in temper- ature of about 1600 K and 1200-1400 K respectively. The magnetic eld strength within the umbra is derived fromtheZeemansplittingoftheStokes-Iprole.Fieldstrengths within the umbra vary between 1500 and 3000 G. Further anal- ysisofthe 846.85 nmspectraindicatesthatthemagneticeld strength within the umbral features is not signicantly reduced neitherforcentrally( 3 %)norforperiphericallylocatedUDs (1-2 %). The 630.25 nm line yields an enhanced weakening of eld strength of 7 % for an isolated located UD. The measured properties of UDs do not vary signicantly during a 40 min observation sequence." @default.
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- W2127887714 date "1997-05-01" @default.
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- W2127887714 title "Some properties of sunspot umbral dots" @default.
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