Sperm motility under weightlessness

SPHERES tethered formation flight testbed: application to NASA's SPECS mission

SPHERES: Design of a Formation Flying Testbed for ISS

Spherical and Aspherical Structure of the Sun

Spherical earth gravity and magnetic anomaly analysis by equivalent point source inversion

Spherically symmetric, polytropic flow

Spheroidal models of magnetic clouds and their comparison with spacecraft measurements

SPINR --- A system for three dimensional ultraviolet imaging spectroscopy of interstellar gas and dust

Spitzer Mapping of PAH Ionization and H2 Temperature in Photodissociation Regions

Splash albedo protons between 4 and 315 MeV at high and low geomagnetic latitudes

Splitting of atomic oxygen height profiles by eddy diffusion

Splitting of the Doppler frequency shift of bi-static backscatter signals during the Sura experiments

Spoken Language Identification Using Hybrid Feature Extraction Methods

Sporadic Ca and Ca+ layers at mid-latitudes: Simultaneous observations and implications for their formation

Sporadic E movement followed with a pencil beam high frequency radar

Sporadic source of ionization in the D- and E-regions of the nocturnal ionosphere at middle latitudes

Sporadic-E as a tracer for atmospheric waves

Sporadic-E associated with the Leonid meteor shower event of November 1998 over low and equatorial latitudes

Sporadic-E layers and unstable wind shears

Spread F and the structure of equatorial ionization depletions in the southern anomaly region