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On the determination of noise in photographic measurements of solar velocities and magnetic fields

✍ Scribed by P. N. Brandt; A. Nesis

Publisher
Springer
Year
1973
Tongue
English
Weight
257 KB
Volume
31
Category
Article
ISSN
0038-0938

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✦ Synopsis

The noise in photographic measurements of solar velocities and magnetic fields is assumed to be essentially determined by the granularity of the film, its gamma, the scanning spot size and the parameters of the specific spectral line. A formula is derived which serves for a quantitative estimate of the rms velocity and magnetic field noise when evaluating spectrograms and spectroheliograms.

Four typical examples are treated and show that the estimate is correct within 200o / . * Mitteilungen aus dem Fraunhofer Institut Nr. 118.

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