The observational evidence of microwave pulsations with very long periods in the corona

Details The observational evidence of microwave pulsations with very long periods in the corona The observational evidence of microwave pulsations with very long periods in the corona

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003acasn..44....8x&link_type=abstract

Acta Astronomica Sinica, vol. 44, no. 1, p. 8-15.

Astronomy and Astrophysics

Astronomy

Sun: Corona, Sun: Radio Radiation, Sun: Oscillations

Scientific paper

A rare event was observed with the microwave(1.0--2.0 and 2.6---3.8 GHz) radio spectrometer (in Beijing) at National Astronomical Observatory of China on September 23, 1998. This event is a complex radio type IV burst associated with multi-periodic pulsations, type III bursts, and type I-like noise storm. The pulsative components containing multiple long periods (about 7.3, 4.9, 3.7,1.2 and 0.4 minutes) are focused in the paper. The pulsations may be attributed to the standing Alfvèn waves mode in the close coronal loop. Because the standing Alfvèn MHD wave driven by the photospheric velocity field passing the magnetic field transversely, the modulation of radio emission is caused. Moreover, because there is a frequency drift downwards (towards photosphere) of the pulsations, it is not excluded the possibility that the oscillation is caused by the propagating disturbance in a close loop or open field structure. With the resonance of the Alfvèn waves is associated with the mode of photospheric 5 minute oscillations, the propose that very long periodic pulsations are come from the driving origin of the photosphere explains the existing possibility of couple existed between the coronal loop and the photosphere.

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