Events In Antarctica Research Articles

Band limited emission with central frequency around 2Hz accompanying powerful cyclones

It has been found that powerful cyclones are proceeded, accompanied and followed by narrow band electromagnetic emission with central frequency around 2Hz. It is shown that the signal from this emission is unique and clearly distinguishable from known types of magnetic pulsations, spectra of local thunderstorms, and signals from industrial sources. This emission was first observed during an unusually powerful cyclone with tornadoes in the western European part of the Soviet Union, which passed by the observatory of Borok from south to north-east. The emission has been confirmed by analysis of similar events in Antarctica. The phenomenon described presents a new aspect of interactions of processes in the lower atmosphere and the ionosphere.

Unconformities in the sediments of the Indian Ocean

Deep sea drilling in the Indian Ocean has revealed unconformities of oceanwide significance. The unconformities are of Oligocene, early Tertiary and late Cretaceous age and can be explained as a consequence of climatic events in Antarctica and subsequent variations in the circulation pattern of the whole Indian Ocean.

The vernal breakdown of the stratospheric cyclone over the South Pole

The synoptic properties of the springtime breakdown of the strong cyclonic vortex characteristic of the polar stratosphere in winter, which has been much studied in the northern hemisphere, are amplified by a description of similar events in Antarctica. The IGY data from the continent were well distributed in longitude in the spring of 1957, and it was possible to construct a model of the baroclinic wave responsible for the breakdown. The model appears to fit what is known about the north polar breakdown. It is concluded that the breakdown of 1957 accompanied the amplification of a single wave disturbance, almost stationary in longitude during its growth.