Computer Science – Sound
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.3003w&link_type=abstract
American Astronomical Society, SPD meeting #40, #30.03; Bulletin of the American Astronomical Society, Vol. 41, p.864
Computer Science
Sound
Scientific paper
We present two cases of propagating slow magnetoacoustic waves in coronal loops observed by Hinode/EIS. In the first case, the 5-min waves were detected in a transition-region line (He II) and five coronal lines (Fe X - Fe XV) at a plage region. We find that the oscillations detected in coronal lines are highly correlated, and the amplitude decreases with increasing temperature. These waves may be caused by the leakage of the p-modes through the chromosphere and transition region into the corona. The temperature dependence of the oscillation amplitudes can be explained by damping of the waves traveling along the loop with multithermal fine structure near the footpoint. In the second case, outwardly propagating (on the order of 100 km/s) quasi-periodic disturbances along a fan-like coronal structure were for the first time detected simultaneously in intensity and Doppler shift. The measured amplitudes for the oscillations are consistent with the interpretation in terms of slow magnetoacoustic waves rather than high-speed outflows. The waves contain multiple harmonics of the periods of 12 min and 25 min. Their origin is not clear. The damping length of these low-frequency waves is distinctly longer than that of 5 min waves previously detected by TRACE in the similar structure. A new application of coronal seismology is given based on this observation, with which the true sound speed and temperature near the loop's footpoint are estimated. The work of LO and TJW was supported by NRL grant N00173-06-1-G033. LO was also supported by NASA grant NNG06GI55G.
Davila Javier
Ofman Leon
Wang Tongjiang
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