Unified D-region ion composition models

Unique Observations of a Geomagnetic SI^+ -- SI^- Pair: Solar Sources and Associated Solar Wind Fluctuations

United Nations Basic Space Science Initiative: 2011 Status Report on the International Space Weather Initiative

Update on the Sun-Earth Connection Chains Observed during the Solar Storm Events of April 2002: New Science & Outreach Aspects

Updating the Near-Earth Neutral Line Model

Upper Atmosphere Layers which Radiate in the Infrared Spectral Region

Upper limit of electron-neutral collision frequency in E- and F-layers

Use of coated silicon field emitters as neutralisers for fundamental physics missions in space

Using solar radio burst integrated fluxes to predict energetic proton flux increases

Using the 630.0-nm nightglow emission as a surrogate for the ionospheric Pedersen conductivity

Utilization of Artificial Earth Satellite Orbital Data to Determine the Wind Velocity in the Thermosphere

UV Cet-Type Flare Stars

V. S. Lebedev and I. L. Beigman, Physics of Highly Excited Atoms and Ions

Validation of SCIAMACHY Ozone Column Densities and Profiles Using Ground-Based FTIR and Millimeter Wave Measurements

Validation of the STORM response in IRI2000

Variations in Atmospheric Ion Composition at Altitudes of 100-200 km (Summary)

Variations in the Soft Component of the Electron Energy Spectrum

Venus-Solar Wind Interaction: Asymmetries and the Escape of O+ Ions

Vertical cloud distribution in the Uranian atmosphere

Vertical inhomogenuity of the magnetic field in the solar flares