A mechanism for pulsation in solar microwave bursts

Details A mechanism for pulsation in solar microwave bursts A mechanism for pulsation in solar microwave bursts

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985cha%26a...9..241y&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 9, Issue 3, p. 241-245.

Astronomy and Astrophysics

Astrophysics

Scientific paper

I suggest that the pulsation in solar microwave bursts is a modulation of gyro-synchrotron radiation. Whistler waves at the foot of a coronal loop (radio source) interact with nonthermal electrons with loss-cone distribution at the top. As a consequence, electrons outside the loss-cone diffuse into the loss-cone, pass through the loop foot, sink in the atmosphere, and emit gyro-synchrotron radiation as additional pulses. Electrons remaining outside the loss-cone give the background radiation of the burst.
Assuming the configuration of a magnetic dipole lying below the photosphere, I calculated the period of pulsation to be 1 s- 1 min. The ratio of the pulse peak to background intensity is calculated to be 0 - 100%; the calculated pulse width is about 0.3 - 50 s. These values are consistent with the observed values. A brief discussion of the probable interpretation of fast, millisecond structures is also given.

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