Nonlinearly Selected Frequencies in Coronal Loops

Details Nonlinearly Selected Frequencies in Coronal Loops Nonlinearly Selected Frequencies in Coronal Loops

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996soph..168..273n&link_type=abstract

Solar Physics, Volume 168, Issue 2, pp.273-277

Physics

5

Scientific paper

A nonlinear process for the resonant generation of low-frequency fast magnetosonic kink waves in coronal loops is discussed. The efficiency of the process is strongly enhanced due to the existence of a nonlinearly selected frequency produced by a constant frequency difference in the dispersion curves in the short wavelength limit. The kink wave with the selected frequency interacts with high-frequency kink and sausage waves. The efficiency of such interaction does not require coherence in the interactive waves. In a loop of width 2 × 103 km, field strength 50 G and number density 5 × 1015 m-3, the nonlinearly selected frequency is of order 46 mHz (period 21.8 s), but this may range through 11 mHz to 184 mHz (periods 86.5 s to 5.4 s) for typical coronal conditions.

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