Oscillations of a loop prominence preceding a limb flare

Details Oscillations of a loop prominence preceding a limb flare Oscillations of a loop prominence preceding a limb flare

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...70..115m&link_type=abstract

Solar Physics, vol. 70, Mar. 1981, p. 115-128.

Physics

31

Coronal Loops, H Alpha Line, Magnetohydrodynamic Waves, Solar Flares, Solar Limb, Solar Prominences, Magnetic Field Configurations, Plasma Currents, Plasma Turbulence, Solar Physics, Steady State, Velocity Distribution

Scientific paper

Observations of a limb flare and an associated loop prominence were obtained in H-alpha with the 512 channel magnetograph of the Kitt Peak National Observatory. Simultaneous radial and torsional oscillations with a period near 75 s, wavelength of 37,000 km, and amplitude of 1-2 km/s were detected in the loop approximately 90 min before the onset of the flare. These coupled oscillations are interpreted in terms of a kink instability of a current carrying flux tube. The magnitude of the steady-state component of current is estimated to be 6 x 10 to the 10th amperes.

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