Abstract:
Observations of multiple oscillations of various magnetohydrodynamic (MHD)
modes may play crucial role in the diagnostics of the local plasma conditions
of solar loops. Magnetically structured coronal loops anchored into the
photosphere exhibit various kinds of MHD oscillations such as fast sausage,
kink, slow acoustic oscillations etc. Exploiting various harmonics of such
observed MHD oscillations may be a tracer of important local plasma
conditions and structuring, e.g. scale heights and signature of stratification,
equilibrium condition, characteristic speed, density contrast, loop expansion
factor/magnetic field divergence etc, which can shed new light on the dynamics
of the solar loops. In this review, I briefly summarize the first observational
signatures of multiple MHD oscillations in various types of solar loops and
discuss their significance in diagnosing the solar atmosphere.