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Prominences show a surprising amount of fine structure and it is widelybelieved that their threads, as seen in H$\alpha$ observations, provideindirect information concerning magnetic field topology. We investigate thespontaneous emergence and evolution of fine structure in high-densitycondensations formed through the process of thermal instability under typicalsolar coronal conditions. Our study reveals intricate multidimensionalprocesses that occur through in situ condensations in a representative coronalvolume in a low plasma beta regime. We performed 2D and 3D numericalsimulations of interacting slow magnetohydrodynamic (MHD) wave modes when allrelevant non-adiabatic effects are included.  We show that the interaction of multiple slow MHD wave modes in a regimeunstable to the thermal mode leads to thermal instability. This initially formspancake-like structures almost orthogonal to the local magnetic field, whilelow-pressure induced inflows of matter generate rebound shocks. This issucceeded by the rapid disruption of these pancake sheets through thin-shellinstabilities evolving naturally from minute ram pressure imbalances. Thiseventually creates high-density blobs accompanied by thread-like features fromshear flow effects. The further evolution of the blobs follows the magneticfield lines, such that a dynamical realignment with the background magneticfield appears. However, the emerging thread-like features are not at allfield-aligned, implying only a very weak link between fine structureorientation and magnetic field topology which has far-reaching implications forfield topology interpretations based on H$\alpha$ observations.

Thermal instabilities: Fragmentation and field misalignment of filament fine structure