Acoustic Shocks in the Quiet Internetwork and the Role of Magnetic Fields

Details Acoustic Shocks in the Quiet Internetwork and the Role of Magnetic Fields Acoustic Shocks in the Quiet Internetwork and the Role of Magnetic Fields

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.2.37c&link_type=abstract

"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,

Physics

Scientific paper

By using imaging spectroscopy in the CaII 854.2 nm line obtained with IBIS over several quiet Sun regions, we present compelling evidence of acoustic shocks occurring in the quiet chromosphere at the dominant 3-minute periodicity. The shocks present many of the characteristics prescribed in 1-D hydrodynamics models, including a mostly vertical propagation of the disturbance from regions of enhanced photospheric velocity at periodicities close to the acoustic cut-off.
Our most interesting result, however, is the large influence that magnetic structures exert on the development of chromospheric shocks. In particular, shocks are essentially absent from extended regions around magnetic network elements, creating the so-called "magnetic shadows". These areas coincide with the presence of chromospheric fibrils rooted in the network itself, that apparently absorb or otherwise modify the upward propagating acoustic waves, inhibiting the formation of shocks.
Intriguingly, we also find a clear reduction in the number of shocks observed in quiet internetwork areas whenever small magnetic structures are seen in MDI HR maps. This is true even when strong photospheric motions at the relevant periods are present. This might imply the need to reevaluate the acoustic contribution to the observed chromospheric "basal" flux.

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