Dynamic Fibrils are driven by Magnetoacoustic Shocks

Details Dynamic Fibrils are driven by Magnetoacoustic Shocks Dynamic Fibrils are driven by Magnetoacoustic Shocks

2006-07-14

arxiv.org/abs/astro-ph/0607332v1

Astrophys.J.647:L73-L76,2006

Astronomy and Astrophysics

Astrophysics

ApJ Letters, in press

Scientific paper

10.1086/507452

The formation of jets such as dynamic fibrils, mottles, and spicules in the solar chromosphere is one of the most important, but also most poorly understood, phenomena of the Sun's magnetized outer atmosphere. We use extremely high-resolution observations from the Swedish 1-m Solar Telescope combined with advanced numerical modeling to show that in active regions these jets are a natural consequence of upwardly propagating slow mode magnetoacoustic shocks. These shocks form when waves generated by convective flows and global p-mode oscillations in the lower lying photosphere leak upward into the magnetized chromosphere. We find excellent agreement between observed and simulated jet velocities, decelerations, lifetimes and lengths. Our findings suggest that previous observations of quiet sun spicules and mottles may also be interpreted in light of a shock driven mechanism.

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