𝔖 Bobbio Scriptorium
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Time-averaged observations of the sun with a 3840 Å filter

✍ Scribed by Gary A. Chapman

Book ID
104647922
Publisher
Springer
Year
1974
Tongue
English
Weight
302 KB
Volume
37
Category
Article
ISSN
0038-0938

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✦ Synopsis

Observations of the Sun with a 3840/~ interference filter of 12 ~ full-width at half-maximum are compared with broad band filtergrams at 5300/~ and 6103/~ magnetograms. The limit for detecting faculae by the three techniques is compared. An improvement in detecting faculae at 3840 ~ can be obtained by time-averaged photographs with the time-averaging done either at the telescope or in the darkroom. The former method has certain disadvantages. The 3840/~ filter can show the presence of faculae near the limb much better than white-light photographs or magnetograms. This feature makes 3840 ~ filtergrams useful in conjunction with solar oblateness studies.

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