The oscillations of a spherical body consisting of hot electron-nuclear plasma are considered. It is shown that there are two basic modes of oscillations. The estimation of the main frequencies of the solar core oscillation gives a satisfactory fit of the calculated spectrum and the measurement data.

Slow magnetoacoustic waves represent an important tool for probing the solar coronal plasma. We quantitatively assess applicability of weak thermal conduction theory to seismology by slow waves. numerically model linear standing wave in a 1D loop, with field-aligned $\kappa_\parallel$ as free parameter and no restrictions on its efficiency. The time variations perturbed plasma parameters, obtai...

Electromagnetic radiation is strongly absorbed by a magnetized plasma if the radiation frequency equals the cyclotron frequency of plasma electrons. It is demonstrated that absorption can be completely canceled in the presence of a magnetostatic field of an undulator, or a second radiation beam, resulting in plasma transparency at the cyclotron frequency. This effect is reminiscent of the elect...