A Caltech Library Service

The apparent reversal of fields at the solar limb

Zirin, Harold (1999) The apparent reversal of fields at the solar limb. Solar Physics, 184 (2). pp. 249-252. ISSN 0038-0938. doi:10.1023/a:1005136823249.

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item:


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.

Item Type:Article
Related URLs:
URLURL TypeDescription ReadCube access
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.
Funding AgencyGrant Number
Subject Keywords:Magnetic Field, Divergence Angle, Longitudinal Magnetic, Field, Solar Limb, Projection Effect
Issue or Number:2
Record Number:CaltechAUTHORS:20200728-152911337
Persistent URL:
Official Citation:Zirin, H. The Apparent Reversal of Fields at the Solar Limb. Solar Physics 184, 249–252 (1999).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104620
Deposited By: Rebecca Minjarez
Deposited On:29 Jul 2020 16:27
Last Modified:16 Nov 2021 18:33

Repository Staff Only: item control page