Understanding Subsurface Geoelectrical and Structural Constrains for Low Frequency Radar Sounding of Jovian Satellites

Understanding the Radar Properties of Cometary Analog Materials: Experimental Approach in Support of the CONSERT experiment onboard the ROSETTA mission

Uniformly spaced field-aligned ionization ducts

Unistab - a New Attitude Control System for Sounding Rockets

Unitary variation of f0F2 as a characteristic of the global state of the ionosphere

United Kingdom programs in balloon ultraviolet astronomy

United Kingdom to Join ESO on July 1, 2002

Universal time effects in the polar ionosphere

Universal variation of the F2-layer critical frequency and solar activity

Universe of Oscillations: Sound - Radiowaves - Gamma-Rays - Ether

University of Virginia infrared sensor experiment (UVIRSE)

Unmanned lunar surface exploration

Unregelmässigkeit und Regelmässigkeit der Sporadischen E-Schicht

Untangling Phase and Time in Monophonic Sounds

Unusual optical properties of shocked deuterium at 13 GPa

Unusual Spectral Behavior of the Saturnian Satellites at Long Thermal Wavelengths

Unusual structure of the dayside low-latitude magnetopause energetic electron layer

Up-sampling and Natural Sample Value Computation for Digital Pulse Width Modulators

Updating of the IRI-1990 with respect to substorms

Upper and lower bounds of periods in variable white dwarfs