Published February 1999
| public
Journal Article
The apparent reversal of fields at the solar limb
- Creators
- Zirin, Harold
Abstract
We show how the apparent reversal of longitudinal magnetic fields near the limb is a projection effect and may be used to estimate the divergence angle of the magnetic canopy. The limb distance at which the apparent reversal is not seen is the limiting angle of divergence of lines of force emerging from the surface. We have surveyed a number of polar limb magnetograms, where the unipolar field makes this easier, and found the divergence angle to be about 20° from the vertical.
Additional Information
© 1999 Kluwer Academic Publishers. Received 8 September 1998; accepted 14 October 1998. I thank Dr Robert Cameron for his helpful suggestions and discussions. This work was supported by NSF ATM-9726147 and NASA NAGW-1972.Additional details
- Eprint ID
- 104620
- DOI
- 10.1023/a:1005136823249
- Resolver ID
- CaltechAUTHORS:20200728-152911337
- ATM-9726147
- NSF
- NAGW-1972
- NASA
- Created
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2020-07-29Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field