Langley Research Center

The Mysteries of Real Materials

The presentation will consist in showing arc jet data mysterious to the modelers. It will show a short movie (10-20 sec) of an arc jet test where a material exhibited a failure mode that nobody understands followed by thermocouple data from arc jet tests on another material of in...

Assessing ozone dynamics during the 2023 summer STAQS field campaign using synergistic observations and model simulations

NASA's Tropospheric Emissions: Monitoring of Pollution (TEMPO) geostationary satellite sensor provides high temporal and spatial resolution measurements critical for monitoring air quality. During the Synergistic TEMPO Air Quality Science (STAQS) component of the 2023 AGES+ campa...

The Cold-Air Outbreaks in the Marine Boundary Layer Experiment model-observation intercomparison project (COMBLE-MIP) – Part 1: Model specification, observational constraints, and preliminary findings

Models struggle to represent the coupled microphysical, turbulent and radiative processes within widespread, long-lived marine cold-air outbreak (CAO) cloud fields, contributing to forecast and climate biases. Here we combine ground-based and satellite measurements to initialize...

Bandwidth of Linear Classically Damped Systems with Application to Experimental Model Aircraft

Bandwidth is a widely known concept and tool used in structural dynamics to measure an oscillator’s capacity to dissipate energy over time, for example, when used in half-power damping estimation of structural modes. RMS bandwidth is a generalization of bandwidth that overcomes s...

Advanced Small Perturbation Potential Flow Theory for Unsteady Aerodynamic and Aeroelastic Analyses

An advanced small perturbation (ASP) potential flow theory has been developed to improve upon the classical transonic small perturbation (TSP) theories that have been used in various computer codes. These computer codes are typically used for unsteady aerodynamic and aeroelastic...

Thermochromic Programmable Metamaterial Particle Ensembles

The orbital deployment of a dust field is a method to remediate small debris (1 mm–1 cm). The debris passes through the field and experiences an induced drag force from collisions with the dust, lowering their orbital lifetimes. Programmable metamaterial particle ensembles (PMPEs...

Airborne eddy covariance measurements of ocean-air VOC fluxes: Distinguishing signal from noise

Abstract. Ocean-atmosphere exchange plays an important but uncertain role for many volatile organic compounds (VOCs). Airborne eddy covariance (EC) enables direct flux quantification over large areas, but VOC applications have largely been performed over land. Here we combine the...

Polarization calibration of spaceborne lidar using dense cirrus–scattered solar background with molecular scattering correction

Abstract. Accurate calibration is essential for spaceborne polarization-sensitive lidars, as biases in depolarization ratio measurements can significantly affect the retrieval of cloud and aerosol properties. A polarization calibration technique based on solar background signals...

Regional FireworksPollution over East and SoutheastAsia from Airborne Observations around the Spring Festival Period

Abstract Fireworks are spectacular, but they also pollute the atmosphere. While fireworks are known to rapidly increase local pollution levels, the regional influences and nanosized appearance of fireworks-related particles are poorly understood. This study collected aerosol part...