  Sausage modes that are axisymmetric fast magnetoacoustic oscillations of
solar coronal loops are characterized by variation of the plasma density and
magnetic field, and hence cause time variations of the electron plasma
frequency and cyclotron frequency. The latter parameters determine the
condition for the double plasma resonance (DPR), which is responsible for the
appearance of zebra-pattern (ZP) structures in time spectra of solar type IV
radio bursts. We perform numerical simulations of standing and propagating
sausage oscillations in a coronal loop modeled as a straight, field-aligned
plasma slab, and determine the time variation of the DPR layer locations.
Instant values of the plasma density and magnetic field at the DPR layers
allowed us to construct skeletons of the time variation of ZP stripes in radio
spectra. In the presence of a sausage oscillation, the ZP structures are shown
to have characteristic wiggles with the time period prescribed by the sausage
oscillation. Standing and propagating sausage oscillations are found to have
different signatures in ZP patterns. We conclude that ZP wiggles can be used
for the detection of short-period sausage oscillations and the exploitation of
their seismological potential.
