Evidence For Forced Kink-mode Loop Oscillations Observed By Sdo/aia

Details Evidence For Forced Kink-mode Loop Oscillations Observed By Sdo/aia Evidence For Forced Kink-mode Loop Oscillations Observed By Sdo/aia

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.2113w&link_type=abstract

American Astronomical Society, SPD meeting #42, #21.13; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Transverse loop oscillations were first discovered by TRACE in EUV wavelength and interpreted as global fast kink modes. These oscillations are impulsively excited by flares or filament eruptions and often show a strong damping within few oscillation periods. The oscillations and the damping mechanism have been intensively studied in observation and theory, leading to great advance in coronal seismology. However, measurements of the damping rate remains difficult, often limited by the short length of the detectable oscillation sequence in one single filter. SDO/AIA with multiple wavebands of unprecedentedly high sensitivity and wide temperature coverage provides a good opportunity in improving the accuracy of these measurements. Here we present an example of long-lasting oscillation events observed using SDO/AIA. In this event, kink oscillations of a slowly evolving coronal loop seen in 171, 193 and 211 A bands are excited by several flow ejections. The oscillations last over one and a half hours with periods of 3-4 min and no evident decay. In particular, the amplitudes of the oscillations show increase during the period of a large flow ejection with speeds of 200-300 km/s which lasts for about a half hour, and then falls down at speeds of 60-70 km/s measured in 304 A band. We interpret the growing oscillations as driven fast magnetosonic waves by impacting flows. We perform preliminary 3D MHD study of the event using an idealized bipolar active region model.

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