1) Electrostatic instabilities of plasma in the topside ionosphere are developing alike to that of solar corona and another plasmas. Satellite measurements of electrostatic noise and theoretical analysis of data on electrostatic and electromagnetic emission, plasma temperature and density are used to reveal new laws in formation and decay of inhomogeneous plasma structures.

2) Theoretical treatment of measurement data upon ionospheric electrostatic waves emission within the frequency band 0.1 - 10 MHz, plasma density and electron temperature is presented to reveal some peculiarities in the processes of plasma trough and different scale cavity formation. Intercosmos-19 and APEX satellite data are investigated thoroughly in order to propose a mechanism of topside ionosphere plasma cavity heating by short waves excited in the electrostatically unstable ionospheric regions. It is shown that the phase - space properties of the broad-band electrostatic noise play very important role in the processes of the growing up and damping of intrinsic electrostatic waves propagating in plasma inhomogeneities. Plasma cavity heating in the topside ionosphere observed in space experiment data most probably depends on propagation conditions of short length electrostatic waves thus permittivity properties of inhomogeneous magnetized hot plasma must be taken into account even for the low temperature ionospheric plasma.