We present high-resolution optical spectroscopy of the X-ray binary system SS 433, obtained over a wide range of orbital phases. The spectra display numerous weak absorption features, and include the clearest example seen to date of those features, resembling a mid-A type supergiant spectrum, that have previously been associated with the mass donor star. However, the new data preclude the hypot...

The study of properties of propagation of interplanetary shocks into the Earth’s magnetosphere is significant to improve our understanding of the Sun-Earth system. The interplanetary shocks interact with the bow shock and cause pressure pulses on the magnetopause and its movement, launching different waves into the magnetosphere. In our study we used a set of more than 40 fast forward shocks to...

The growth of the atmospheric convective boundary layer (CBL) is forced mostly by buoyancy production at the surface. However, wind shear has a significant impact on the turbulence structure within the CBL and can contribute significantly to CBL growth when mean winds or wind shear in the lower atmosphere are strong and buoyancy flux from the surface and stratification in the free atmosphere ab...

Preserving the soundscape and geographic extension of quiet areas is a great challenge against the wide-spreading of environmental noise. The E.U. Environmental Noise Directive underlines the need to preserve quiet areas as a new aim for the management of noise in European countries. At the same time, due to their low population density, rural areas characterized by suitable wind are considered...

This paper surveys the impact of large scale wind power integration on the small signal stability performance of the power systems. For this purpose, different factors concerning wind power generation such as wind power integration levels and wind power plant location are considered in the small signal stability assessment of a weak power system via modal analysis. The changes in the modal char...