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 B ~> 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.
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 B ~> 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 | American English |
|---|---|
| Pages (from-to) | 165-179 |
| Number of pages | 15 |
| Journal | Solar Physics |
| Volume | 58 |
| Issue number | 1 |
| State | Published - 1978 |