Cosmological magnetic dynamo in the early Universe

We study the behavior of large-scale magnetic fields in the early Universe influenced by an instability associated with breaking of mirror symmetry in weak interactions. It is shown that the magnetic field, whose present scale reaches about 500 m, which is negligible for galactic sizes, increases considerably if we correctly take into account the dynamics of the Universe. We conclude that this magnetic field is unlikely to provide the seed field for galactic dynamos, nearly independent of the particular instability considered.     

Oppositely directed waves of stellar activity in simple dynamo models

Excitations of two oppositely directed waves of stellar activity generated by two dynamo-active layers located in a single stellar hemisphere are examined using simple dynamo models. The domains of model parameters corresponding to various types and directions of the activity waves are found. It is shown that oppositely directed waves of activity are generated if the dynamo numbers have the same order of magnitude, ~10⁵?10⁶, but opposite signs. How frequently this case can be observed among real stars remains open to question. The report of oppositely directed waves of stellar activity in the literature is especially valuable in this connection.     

Spatial and Temporal Dynamics of Sources and Water Regime of the Ugol’naya-Dionisiya River (Anadyr Lowland,Chukotka)

Water Resources - For the first time, by analyzing the spatial variations and diurnal dynamics of the water regime of the small river of the Anadyr Lowland, the main sources were studied and the...     

Influence of ice regime on riverbed processes and morphology of small permanent streams

It was revealed that, in extremely cold years, small permanent streams of the Russian Plain are imposed to total freezing and ice mounds formation. Influence of these phenomena on riverbeds formation is shown.     

Beaded channels of small rivers in permafrost zones

We examine the factors that are responsible for the formation of the beaded structure of channels in the permafrost zone. It is found that formation of beaded channels in the permafrost zone is possible only in the case of small gradients and water flow rates. The existence of such channels in the permafrost zone is unstable; hence, there is little likelihood that they have persisted in a relict form to date     

Magnetic fields in the radiative-transport zone and the solar cycle

It is shown that a hypothetical relict magnetic field in the solar radiative-transport zone that penetrates into the convective zone would affect the solar dynamo, resulting in radical changes in the butterfly diagrams. This would transform the traveling waves of activity into standing waves. A comparison of our results with the well-known butterfly diagrams for the Sun gives an upper limit of the order of some tens G for the value of relict magnetic field penetrating into the solar convective zone. At the same time, it is not ruled out that such relict magnetic fields in other solar-type stars are strong enough to make the activity waves become standing waves.     

The Forms of Linear Structure of Overland Flow in Medium-Height Mountain Regions: Case Study of the Sikhote Alin

Water Resources - Large subsurface streams on steep slopes have stable positions with distinct catchment areas (drainage basins), linear shapes, and lengths of tens and hundreds meters. They form a...