We present the results of X-ray diagnostics of Z-pinch
hot points, formed during fast electrical discharges through exploding
Al wires. Experimental data include the pinhole images and X-ray time
integrated radiation spectra. These spectra were obtained with high
spectral resolution in the range 1.5–2.2 keV, contained the
most intensive resonance lines of Al H- and He-like ions. Comparison
of the recorded lines width and peak intensities with the corresponding
modeled values, enables us to estimate the main hydrodynamical parameters
of hot point, such as average temperature and density, being achieved at
a moment of its maximum compression. Additionally, on the base of
theoretical analysis of the spectral intensities distribution in
well-resolved Lyα satellites, the gradient of compression
velocities field is concluded. Some features of the investigated
lines spectra forming are discussed.