Persistent 1.5 S oscillations superimposed to a solar burst observed at two mm-wavelengths

Details Persistent 1.5 S oscillations superimposed to a solar burst observed at two mm-wavelengths Persistent 1.5 S oscillations superimposed to a solar burst observed at two mm-wavelengths

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...92..283z&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 92, May 1984, p. 283-298. Research supported by the Financiadora de Estudos e Projetos and

Physics

15

Magnetically Trapped Particles, Millimeter Waves, Solar Oscillations, Solar Radio Bursts, Amplitudes, Cross Correlation, Electrons, H Alpha Line, Solar Flares, Solar Magnetic Field, Synchrotron Radiation

Scientific paper

Long-enduring quasi-periodic oscillations (1.5 s) superimposed upon a solar burst have for the first time been observed simultaneously at two different mm-wavelengths (22 GHz and 44 GHz). The oscillations were present throughout the burst duration (about 10 min), and were delayed at 44 GHz with respect to 22 GHz by 0.3 s. The relative amplitude of the oscillation was of about 20 percent at 44 GHz and of about 5 percent at 22 GHz. Interferometer measurements at 10.6 GHz indicated the burst source position stable within 1 arcsec. An He I D3 line flare showed two persistent small spots separated by about 10 arcsec. The 22/44 GHz burst position corresponds well with the location of the He I D3 spots. The oscillations display features which distinguish them from ultrafast time structures found in other bursts. One possible interpretation is a modulation of the synchrotron emission of trapped electrons by a variable magnetic field on a double burst source, optically thin at 44 GHz and with optical thickness more than about 0.3 at 22 GHz.

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