Near-ground turbulence profiles from lunar scintillometer

Turbulence Profiling Using a Scanning Scintillometer

Selfconsistent Evaluation of Residual Shear Stress Profiles near Ground Surfaces

The presence of large residual shear stresses near ground surfaces are often revealed by x-ray diffraction analysis’. With the X-Ray-Integral-AJethod(RIM)Z it is now possible to determine the depth profiles of strains and stresses as a function of the true depth below the surface. However, any shear stress component parallel to a free surface must be zero at the surface itself Therefore, the de...

Unravelling turbulence near walls

Turbulent flows near walls have been the focus of intense study since their first description by Ludwig Prandtl over 100 years ago. They are critical in determining the drag and lift of an aircraft wing for example. Key challenges are to understand the physical mechanisms causing the transition from smooth, laminar flow to turbulent flow and how the turbulence is then maintained. Recent direct ...

Characterizing the near Lunar Plasma Environment

of Science Topic: The ambient plasma and solar UV incident on the lunar surface cause it to become electrically charged [1,2]. On the dayside, solar UV photocharging typically dominates, so the surface charges positive [3,4]; while on the nightside the plasma electrons usually dominate and thus the surface charges negative [5]. The resulting surface electric potential is confined to a near-surf...

Electron Density Profiles Derived From Ground-Based GPS Observations

Nowadays GPS is widely used to monitor the ionosphere. However, the current results from ground-based GPS observations only provide some information on the horizontal structure of the ionosphere, and are extremely restricted in mapping its vertical structure. In this paper, tomography reconstruction technique was used to image 3D ionospheric structure with ground-based GPS. The first result of ...