Abstract
Large-scale morphological waves with wavelengths of order 30° and amplitude=1/8λ exist in several long Hi filaments in a 540 square degrees of sky aroundl=230°,b=+40°. The extent of the longest filament is greater than 72°, the limit set by the boundaries of the area surveyed. TheHi gas appears to be controlled by magnetic fields and the motion within flux tubes, determined by analysis of velocity along the filament axes, shows the presence of wave patterns with amplitude 5 to 6 km s−1 on an angular scale similar to that seen in the spatial structure projected on the sky.
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Verschuur, G.L. Neutral hydrogen filaments at high galactic latitudes. Astrophys Space Sci 185, 137–152 (1991). https://doi.org/10.1007/BF00642712
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DOI: https://doi.org/10.1007/BF00642712