Evidence of Shock-Driven Turbulence in the Solar Chromosphere

Details Evidence of Shock-Driven Turbulence in the Solar Chromosphere Evidence of Shock-Driven Turbulence in the Solar Chromosphere

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp21b..03r&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SP21B-03

Mathematics

Probability

7507 Chromosphere, 7509 Corona, 7529 Photosphere, 7851 Shock Waves (4455), 7863 Turbulence (4490)

Scientific paper

We present observations of photospheric and chromospheric velocities at high spatial resolution using the Interferometric Bidimensional Spectrometer (IBIS). We study an area of quiet Sun and apply Fourier analysis to the velocity time series. We confirm the presence of significant power in the chromosphere above the cutoff frequency and find that it obeys power-law distribution with frequency up to our 25 mHz Nyquist limit. We further characterize the observations in terms of Probability Density Functions (PDFs) and find that the chromospheric PDFs are non-Gaussian and asymmetric. This suggests that the chromospheric high-frequency power is probably not made up of short-period waves propagating upward from the photosphere, but rather is the signature of turbulence generated within the chromosphere from shock oscillations near the cutoff frequency. The presence of this pervasive and broad spectrum of motions in the chromosphere is important for atmospheric modeling and is likely to have implications for the excitation of coronal loop oscillations.

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