Oblique sounding of an auroral ionospheric HF channel
Oblique sounding of the ionosphere by CW linear-FM signals
Oblique-incidence ionospheric soundings over Central Europe and their application for testing now casting and long term prediction models
Observation and analysis of intensity oscillations in the solar K-line
Observation and interpretation of particle and electric field measurements inside and adjacent to an active auroral arc
Observation and interpretation of plasma motions in the polar cap ionosphere during magnetic substorms
Observation and possible causes of new ozone depletion in Antarctica in 1991
Observation of a north-south anisotropy of atmospheric radiation at balloon altitudes
Observation of a structured auroral field-aligned current system
Observation of an energetic proton beam and the generation of ULF-waves above active auroral forms
Observation of an ionospheric acceleration mechanism producing energetic /keV/ ions primarily normal to the geomagnetic field direction
Observation of atmospheric turbulence from high resolution balloon soundings ST radar
Observation of auroral hiss by the S-310JA-6 sounding rocket
Observation of Bound States and Counterrotating Lower Hybrid Eigenmodes in the Auroral Ionosphere
Observation of bremsstrahlung from solar electrons in the earth's atmosphere
Observation of Centaurus A in the MeV gamma range
Observation of cold-ion fluxes from the plasmasphere into the ionosphere at night at midlatitudes
Observation of Cygnus X-1 in the energy range 100 keV-3 MeV
Observation of diffuse cosmic gamma rays in the 100-700 MeV energy range by the Cosmos-731 satellite
Observation of double-layer-like structures at rocket altitudes