منابع مشابه
Oscillations and running waves observed in sunspots
In order to study umbral oscillations, running penumbral waves and the relationship between them, we analyzed CCD, high resolution, sunspot observations obtained at center and the wings of the Hα line and the Fe I 5576 Å line. The UBF filter was used in order to produce high cadence sequences of filtergrams. Images were processed to remove the sharp intensity gradient between the umbra and the ...
متن کاملOscillations and running waves observed in sunspots ? II . Photospheric waves
To continue our study of waves related to sunspots in the photosphere, we analyzed CCD, high resolution sunspot observations obtained in the Fe i 557.6 nm line. We produced " time slice images " which reveal inward slow propagating waves in the photospheric penumbra and outward propagating waves in the area around the sunspot. The phase velocity of the waves is near 0.5 km s −1 in both cases an...
متن کاملSunspots in the Laboratory
We show that extrinsic or non-fundamental uncertainty influences markets in a controlled environment. This work provides the first direct evidence of sunspot equilibria. These equilibria require a common understanding of the semantics of the sunspot variable, and they appear to be sensitive to the flow of information. Extrinsic uncertainty matters when information flows slowly, as in a call mar...
متن کاملFine Structure in Sunspots
■ Abstract Important physical processes on the Sun, and especially in sunspots, occur on spatial scales at or below the limiting resolution of current solar telescopes. Over the past decade, using a number of new techniques, high-resolution observations have begun to reveal the complex thermal and magnetic structure of a sunspot, along with associated flows and oscillations. During this time re...
متن کاملModelling broadband polarisation in sunspots
The eeect of line overlap (blending) on broadband linear (NLP) and circular (NCP) polarisation in spectra of solar magnetic regions , especially sunspot umbrae, is explored in a systematic way, employing spectrum synthesis in polarised light on a grand scale over thousands of Angstrr oms. An extensive grid of theoretical Stokes IQU V spectra allows the discussion of the dependence of NLP and NC...
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ژورنال
عنوان ژورنال: Australian Journal of Physics
سال: 1985
ISSN: 0004-9506
DOI: 10.1071/ph850811