Abstract
A mechanism of excitation of radial oscillations of a 'magnetic tube' is proposed for the interpretation of a periodic modulation of type IV radio burst intensity in the meter and decimeter range. After the flare a configuration with denser plasma extended along the magnetic field can be formed in the corona. Eigenoscillations of such a system are damped by MHD-wave emission into the external coronal plasma. However, if high energy protons with β ≳ 0.2 are trapped by this configuration, the damping of oscillations can be made up for by an amplification due to bounce-resonant plasma instability. The regularity of the pulse period is explained by presence of a maximum in the wave growth rate dependence on the frequency.
Original language | English |
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Pages (from-to) | 165-179 |
Number of pages | 15 |
Journal | Solar Physics |
Volume | 58 |
Issue number | 1 |
DOIs | |
State | Published - Jun 1978 |
Externally published | Yes |