Detections of high-frequency oscillations in solar active region coronal loops

Details Detections of high-frequency oscillations in solar active region coronal loops Detections of high-frequency oscillations in solar active region coronal loops

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.505..441k&link_type=abstract

In: SOLMAG 2002. Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 Jun

Physics

1

Mhd, Waves, Eclipses, Corona, Oscillations

Scientific paper

One of the mechanisms proposed as a possible solution to the Sun's coronal heating problem is the damping of energy carried by magnetohydrodynamic (MHD) waves that are expected to be present in active regions. Continuing previous work on total solar eclipse data, we provide further obervational evidence for the existence of high-frequency MHD waves in coronal loops. Wavelet analysis is used to identify 21 areas of 4×4 arcsec2 with periodic intensity oscillations. The frequency range of these detections was 0.2-0.3 Hz and all last for at least 3 periods at a confidence level of more than 99%. All of the above detections are made just outside known coronal loops, leading us to suggest a possible, unconventional mechanism.

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