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Some comments on the limb shift of solar lines

✍ Scribed by Jacques M. Beckers; George Driver Nelson

Publisher
Springer
Year
1978
Tongue
English
Weight
943 KB
Volume
58
Category
Article
ISSN
0038-0938

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✦ Synopsis

The well-known correlation between granulation intensity and velocity fluctuations causes a shift of the average line position called the 'convective blue shift'. It is argued that this convective blue shift is most likely reponsible for the limb effect of solar Fraunhofer lines. To explain the center-to-limb variation of this limb effect it is essential that both horizontal and vertical motions in the granulation are considered. The effects of a variation in the granulation properties across the Sun on large scale velocity pattern observations are discussed. Abnormal granulation patterns observed inactive regions and at the boundaries of supergranules could be responsible for part or all of the 'd0wnflow' observed there.

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