Engineering topics
Bowman, Daniel
Publications and source records attributed to Bowman, Daniel.
Single-unit Directional Infrasound Sensing Using Acoustic Metamaterials and Aeroseismometry.
Abstract not provided.
Solar Climate Intervention: Establishing baseline metrics for the lower stratosphere using the heliotrope solar hot air balloon system.
Abstract not provided.
Observations of Stratospheric Aerosols from Heliotrope Solar Hot Air Balloons.
Abstract not provided.
Assessing the repeatability of acoustic signals originating from closely spaced events.
Abstract not provided.
Evidence of Ionospheric Perturbations from a Buried Chemical Explosion captured using High-Rate GNSS Measurements.
Abstract not provided.
Geophysical and Planetary Acoustics on Balloons
Natural events and human activity often generate acoustic waves capable of traveling tens to tens of thousands of kilometers across the globe. Ground-based acoustic sensors are limited to dry land and often suffer from wind noise. In contrast, balloon borne acoustic sensors can cross oceans, polar ice caps, and other inhospitable areas, greatly expanding sensor coverage. Since they move with the mean wind speed, their background noise levels are exceptionally low. In the last six years, such sensors have recorded sounds from colliding ocean waves, surface and buried chemical explosions, thunder, wind/mountain interactions, wind turbines, aircraft, and possibly meteors and the aurora. These results have led to new insights on acoustic heating of the upper atmosphere, the detectability of underground explosions, and directional sound fields generated by ocean waves.
Sources and spatiotemporal patterns of anthropogenic infrasound in urban areas.
Abstract not provided.
Evaluating microbarom source models using infrasound recorded on a stratospheric balloon.
Abstract not provided.
Seismology on Venus with infrasound observations from balloon and orbit
The study of Venus' evolution is inexorably linked with studying its interior properties, which can be investigated by performing seismic studies on the planet. However, seismology on Venus has long eluded planetary scientists due to technological challenges presented by high surface temperature and pressure, which limit lifetimes of surface-based instrumentation. In this white paper, we present two complementary techniques for performing seismology on Venus by measuring the low-frequency acoustic signature (infrasound) produced by seismic activity through coupling between the solid planet and the atmosphere. These techniques may be implemented with technology available today, without the use of high-temperature electronics.
Impacts of minute-scale atmospheric variability on acoustic signals from surface explosions.
Abstract not provided.
Summary Slide: Infrasound from DAG-4 recorded on a stratospheric balloon.
Abstract not provided.
Summary Slide: Impacts of minute-scale atmospheric variability on acoustic signals from surface explosions.
Abstract not provided.