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The relationship between observed structures in the solar atmosphere and themagnetic fields threading them is known only for the solar photosphere, eventhen imprecisely. We suggest that some of the fine structure in the moretenuous chromosphere and corona- specifically some populations of spicules andfibrils- correspond to warps in 2D sheet-like structures, as an alternative toconventional interpretations in terms of tube-like structures. The sheets areperhaps related to magnetic tangential discontinuities, which Parker has arguedarise naturally in low-beta conditions. Some consequences of this suggestion,if it can be confirmed, are discussed.

Thermal fine structure and magnetic fields in the solar atmosphere: spicules and fibrils