Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..848..133r&link_type=abstract
RECENT ADVANCES IN ASTRONOMY AND ASTROPHYSICS: 7th International Conference of the Hellenic Astronomical Society. AIP Conferenc
Astronomy and Astrophysics
Astrophysics
1
Mhd Waves, Plasma Waves, Turbulence, Coronal Loops, Streamers, Flares, Radio, Microwave
Scientific paper
Study of an oscillating loop observed with high spatial resolution (NoRH) shows the presence of two Fourier spectral peaks: P1 = 14-17 s, which is more pronounced at the loop apex and P2 = 8-11 s, that is stronger at the loop legs. We found the phase shift, P2/4, between the pulsations at the northern leg and at the loop top for the P2 spectral component and a lack of the phase shift between different parts of the flare loop for the P1 component. The computed phase speeds and periods of MHD modes of a coronal loop confirm identification of the first periodicity P1 as the global (fundamental) sausage mode. The second periodicity can be associated with several modes: the second and the third longitudinal harmonics of the kink mode, the third harmonics of the sausage mode and the second harmonics of ballooning mode.
Melnikov Victor F.
Nakariakov Valery M.
Reznikova Veronika E.
Shibasaki Kiyoto
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