Journal
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
Volume 59, Issue -, Pages S663-S668Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pasj/59.sp3.S663
Keywords
Sun : atmospheric motions; Sun : chromosphere; waves
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Funding
- Science and Technology Facilities Council [PP/D002907/1] Funding Source: researchfish
- STFC [PP/D002907/1] Funding Source: UKRI
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We use Hinode/SOT Ca II H-line and blue continuum broadband observations to study the presence and power of high frequency acoustic waves at high spatial resolution. We find that there is no dominant power at small spatial scales; the integrated power using the full resolution of Hinode (0.'' 05 pixels, 0.'' 16 resolution) is larger than the power in the data degraded to 0.'' 15 pixels (TRACE pixel size) by only a factor of 1.2. At 20 mHz the ratio is 1.6. Combining this result with the estimates of the acoustic flux based on TRACE data of Fossum and Carlsson (2006, ApJ, 646, 579), we conclude that the total energy flux in acoustic waves of frequency 5-40 mHz entering the internetwork chromosphere of the quiet Sun is less than 800 W m(-2), inadequate to balance the radiative losses in a static chromosphere by a factor of five.
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