Observation of electron acceleration in the ionospheric plasma near local plasma frequency by emission from a high-power onboard radio transmitter aboard the Intercosmos-19 satellite

Observation of electron bunching during Landau growth and damping

Observation of electron temperature anisotropy in the ionosphere - A review

Observation of features in the soft X-ray background flux

Observation of fourth vibrational overtone of hydrogen

Observation of giant planets and comets in the Far infrared and submillimeteric range

Observation of gravity waves during the extreme tornado outbreak of 3 April 1974

Observation of gravity waves in the high-latitude F-layer by using fixed frequency sounding

Observation of impulsive acoustic events and the excitation of solar oscillations

Observation of impulsive acoustic events and the excitation of solar oscillations

Observation of infrasonic and gravity waves at Soufrière Hills Volcano, Montserrat

Observation of low-energy charged particles by the SF-3M spectrometer on board the Cosmos-1809 satellite

Observation of NOx enhancement and ozone depletion in the Northern and Southern Hemispheres after the October-November 2003 solar proton events

Observation of O2 variability at mid-latitudes from 1450-A measurements

Observation of oscillations in coronal loops

Observation of relativistic electrons in the outer radiation belt on the Prognoz-3 satellite during 1973-1974

Observation of short-period pulsations in electron and gamma-ray fluxes in upper layers of the atmosphere and their association with periodic oscillations of the sun's diameter

Observation of sub-inertial internal tides in McMurdo Sound, Antarctica

Observation of synchronous picosecond sonoluminescence

Observation of the absolute intensity of the sun in the vacuum ultraviolet region