Water vapor distributions, as measured by the Lidar Atmospheric Sensing Experiment (LASE), are shown to be a reliable indicator of stratospheric-tropospheric exchange events.

water vapor LASE DIAL Stratosphere Troposphere PEM↗

NASA NTRS2000

Lidar Measurements of Relative Humidity and Ice Supersaturation in the Upper Troposphere

We compute upper tropospheric relative humidity profiles using water vapor profiles measured by an airborne DIAL and a ground-based Raman lidar.

LASE↗

NASA NTRS2000

Polar Stratospheric Cloud Characteristics Observed with Airborne Lidar During the SOLVE Campaign

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SOLVE Sage III Dial NAT PSC Polar Vortex MTP↗

NASA NTRS2000

Aircraft Observations of Thin Cirrus Clouds Near the Tropical Tropopause

This work describes aircraft-based lidar observations of thin cirrus clouds at the tropical tropopause in the central Pacific obtained during the Tropical Ozone Transport Experiment/Vortex Ozone Transport Experiment (TOTE/VOTE) in December 1995 and February 1996.

cirrus↗

NASA NTRS2000

Space VLBI at Low Frequencies

At sufficiently low frequencies, no ground-based radio array will be able to produce high resolution images while looking through the ionosphere.

Space VLBI Interferometry Low Frequency↗

NASA NTRS2000

Observations of Stratospheric Gravity Waves During the WB57F Aerosol Mission and Modeling with Mesoscale Model 5

On April 11, 1998 WB57F aircraft flew northwest at lower stratospheric altitudes from Houston, Texas, over eastern Wyoming as part of the WB57F Aerosol Mission to sample a vortex filament forecast to pass over that region.

Gravity Waves Clear Air Turbulence (CAT) MM5 lee w↗

NASA NTRS2000

Scale Invariance of High Altitude Aircraft Observations in the Upper Troposphere and Lower Stratosphere at Tropical and Subtropical Latitudes

Exchange between the upper tropical troposphere and the lower troposphere is considered by examining high altitude aircraft observations of water, ozone, methane, wind and temperature for scale invariance.

altitude aircraft observations↗

NASA NTRS2000

Large-Scale Air Mass Characteristics Observed Over the Remote Tropical Pacific Ocean During March-April 1999: Results from PEM Tropics B Field Experiment

Eighteen long-range flights over the Pacific Ocean from 38 degrees S to 20 degrees N and 166 degrees E to 90 degrees W were made during the NASA Pacific Exploratory Mission B (PEM Tropics B) conducted from March 6 to April 18, 1999.

Tropical↗

NASA NTRS1999

Low Frequency Radio Astronomy from Above the Ionosphere

Explore the source record for details and available documents.

VLBI low frequency interferometry surveys↗

NASA NTRS1999

Effects of Aircraft on Aerosol Abundance

A significant increase in sulfuric acid aerosol concentration was detected above 10 km pressure altitude during a cross-corridor flight out of Shannon, Ireland, on October 23, 1997.

atmospheric aerosol aircraft emissions↗

NASA NTRS1999

Observations of Convective and Dynamical Instabilities in Tropospause Folds and their Contributions to Stratosphere-Trophosphere Exchange

With aircraft-mounted in-situ and remote sensing instruments for dynamical, thermal, and chemical measurements, we studied two cases of tropopause folding.

Stratospheric-Trophosphere Exchange Kelvin-Helmhol↗

NASA NTRS1999

The Astronomical Low Frequency Array: A Proposed Explorer Mission for Radio Astronomy

A radio interferometer array in space providing high dynamic range images with unprecedented angular resolution over the broad frequency range from 0.030 - 30 MHz will open new vistas in solar, terrestial, galactic, and extragalactic astrophysics.

radio astronomy VLBJ interferometry explorer missi↗