First evidence of interaction between longitudinal and transverse waves in solar magnetic elements

Abstract

Small-scale magnetic fields are thought to play an important role in the heating of the outer solar atmosphere. By taking advantage of the unprecedented high-spatial and temporal cadence of IMaX, the filter vector polarimeter on board the Sunrise balloon-borne observatory, we study the transversal and longitudinal velocity oscillations in small magnetic elements. The results of this analysis are then compared to MHD simulations, showing excellent agreement. We found buffeting-induced transverse oscillations with velocity amplitudes of the order of 1-2 km/s, to be common along with longitudinal oscillations with amplitudes 0.4 km/s. Moreover, we also found an interaction between transverse oscillations and longitudinal velocity oscillations, showing a +-90 degrees phase lag at the frequency at which they exhibit the maximum coherence in the power spectrum. Our results are consistent with the theoretical picture in which MHD longitudinal waves are excited inside small magnetic elements as a response of the flux tube to the forcing action of the granular flows.

9 pages, 7 figures, A&A accepted

References in corpus (9)

• Alfven Waves in the Lower Solar Atmosphere
• A solar surface dynamo
• The solar magnetic field
• Penumbral structure and outflows in simulated sunspots
• Magnetic flux emergence in granular convection: Radiative MHD simulations and observational signatures
• Solar Magnetic Tracking. I. Software Comparison and Recommended Practices
• Channeling 5-min photospheric oscillations into the solar outer atmosphere through small-scale vertical magnetic flux tubes
• Non-linear numerical simulations of magneto-acoustic wave propagation in small-scale flux tubes
• Structure and Dynamics of Isolated Internetwork Ca II H Bright Points Observed by Sunrise

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