Oscillations in EUV emission lines during a loop brightening

Details Oscillations in EUV emission lines during a loop brightening Oscillations in EUV emission lines during a loop brightening

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...93...85a&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 93, June 1984, p. 85-94. Research supported by the Consiglio Nazionale delle Ricerche.

Physics

15

Coronal Loops, Emission Spectra, Solar Flux Density, Solar Oscillations, Solar Spectra, Ultraviolet Spectra, Extreme Ultraviolet Radiation, Plasma Waves, Solar Magnetic Field, Spectroheliographs

Scientific paper

Oscillations in the emission in the ultraviolet lines of C II, O IV, and Mg X, detected by the Harvard College Observatory EUV spectroheliometer on Skylab are observed on August 7, 1973, during a loop brightening. The intensity of the EUV lines varies with a period of 141 s during the time of enhanced intensity of the coronal loop, lasting 10 min. The periodic oscillation is not only localized in the loop region but extends over a larger area of the active region, maintaining the same phase. The authors suggest that the intensity fluctuation of the EUV lines is caused by small-amplitude waves, propagating in the plasma confined in the magnetic loop and that size of the loop might be important in determining its preferential heating in the active region.

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