The space activities of Spain
The space laboratory of University College London
The Space Processing Mission of TEXUS-1 with Respect to Micro-G Environment and Recovery
The Spanish national balloon and sounding rocket program
The Spartan-281 Far Ultraviolet Imaging Spectrograph
The spatial coherence of travelling ionospheric disturbances at mid-latitudes
The spatial relationship between ionospheric regions generating reflections during oblique short-wave radio sounding and auroral arcs
The spatial structure of the solar wind transition region
The spatial variation of water and ammonia near Jupiter's Great Red SPOT
The spatial-temporal ambiguity in auroral modeling
The special Soviet radio network for Vega balloon data acquisition and interferometry
The special technical features of Geos
The spectral and frequency characteristics of high-power and test signals of oblique sounding at close frequencies
The spectral form of small-scale plasma turbulence in the auroral ionosphere
The Spectrum of Auroral Suprathermal Electrons
The spectrum of auroral suprathermal electrons
The spectrum of primary electrons with energies exceeding 3 GeV
The spectrum of the small-scale part of artificial ionospheric turbulence
The spectrum shape of large-scale artificial irregularities excited using the Gissar heating facility
The Sporadic E and Descending Layers in the Equatorial Anomaly Region