Abstract
The appearance of the Hα fibrils suggests the presence of magnetic fields inclined at noticeably non-radial angles in the Sun's chromosphere. We present evidence to suggest that these angles continue into the photosphere.
The presence even of small non-radial inclinations can significantly affect the appearance of regions observed by a longitudinal magnetograph. In particular, a simple bipolar loop can appear unbalanced when viewed near the limb. We suggest that the observed polar signal may be nothing more than a geometric effect arising when a balanced but systematically aligned array of bipolar pairs is viewed at an angle.
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Pope, T., Mosher, J. Evidence for non-radial fields in the Sun's photosphere and a possible explanation of the polar magnetic signal. Sol Phys 44, 3–12 (1975). https://doi.org/10.1007/BF00156842
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DOI: https://doi.org/10.1007/BF00156842