Detectability of High Frequency Acoustic Waves with TRACE

Details Detectability of High Frequency Acoustic Waves with TRACE Detectability of High Frequency Acoustic Waves with TRACE

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.547..125f&link_type=abstract

Proceedings of 'SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO a

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High Frequency Acoustic Waves, Trace

Scientific paper

High frequency acoustic waves have been proposed as a mechanism to heat the Solar chromosphere in internetwork regions. Such waves are difficult to detect using ground based observations because of seeing. Space based Solar observatories like SOHO and TRACE are not hampered by such high frequency disturbances caused by the Earth's atmosphere. We have used detailed NLTE radiation hydrodynamic simulations to investigate the detectability of high frequency acoustic waves with TRACE. A broad spectrum of acoustic waves are fed into the computational domain at the lower boundary of the model atmosphere and TRACE UV continuum intensities are calculated by folding the derived intensities with the TRACE filter functions for the 1600 and 1700 filters. Power spectra, phase diagrams and intensity response functions are calculated and intensity formation heights are derived. The simulations show that the width of the TRACE intensity response functions sets an upper frequency limit of 40 mHz for the detection of high frequency waves even in the absence of instrumental noise. Furthermore, Poisson noise for typical TRACE exposure times in a 30 minute time-series limits the detectability to below 25 mHz.

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