Investigation of gamma quanta with energies equal to or greater than 40 MeV in the upper layers of the atmosphere

Investigation of height gradient in vertical plasma drift at equatorial ionosphere using multifrequency HF Doppler radar

Investigation of high-energy electrons by the Intercosmos-17 satellite

Investigation of interdiurnal variations of states of the ionosphere according to geostationary-satellite signal data

Investigation of ion composition in geostationary orbit Preliminary results

Investigation of ionospheric irregularities by probing technique

Investigation of ionospheric precursors leading to spread F during the EQUIS II campaign on Kwajalein.

Investigation of O/+/ and N/+/ ion concentration variations, the dynamics of the ionosphere, and energetic energy fluxes in the upper ionosphere from the Meteor satellite. I - Measurements in the midlatitude ionosphere

Investigation of Pickering Crater (Mars) by Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS)

Investigation of Planetary Surfaces by Acoustic Sounding

Investigation of Planets and Small Bodies Using Decameter Wavelength Radar Sounders

Investigation of plasma irregularity sources associated with charged dust in the earth’s mesosphere

Investigation of Radio Wave Propagation in the Martian Ionosphere Utilizing HF Sounding Techniques

Investigation of shock waves and tangential discontinuities of the cosmic plasma by the radio interference technique

Investigation of short-period fluctuations in the daily f0F2 pattern at magnetically conjugate points

Investigation of small-scale and large-scale ionospheric structures

Investigation of solar-flare effects by the oblique sounding of the ionosphere

Investigation of sporadic solar radio emission and earth-ionosphere parameters on the Intercosmos Copernicus-500 satellite. V - Results on ionospheric electron density

Investigation of Subsurface Connections in Complexes of Activity by Local Helioseismology

Investigation of the anisotropy of ionospheric inhomogeneities during oblique sounding