Results 1 to 10 of about 65,472 (268)

The Micro‐Broadband Receiver (μBBR) on the Very‐Low‐Frequency Propagation Mapper CubeSat

Earth and Space Science, 2021
The very low frequency (VLF) propagation mapper (VPM) is a 6U CubeSat designed to measure VLF radio waves in Low‐Earth Orbit. The science goals of the VPM mission are to measure VLF signals broadcast by the DSX mission, and to study natural and ...
Robert A. Marshall, Austin Sousa, Riley Reid, Gordon Wilson, Michael Starks, Daniel Ramos, John Ballenthin, Steven Quigley, Ron Kay, James Patton, Joseph Coombs, Judy Fennelly, Ivan Linscott, Umran S. Inan   +13 more
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Discovery and insights from DSX mission’s high-power VLF wave transmission experiments in the radiation belts

Scientific Reports, 2022
Space weather phenomena can threaten space technologies. A hazard among these is the population of relativistic electrons in the Van Allen radiation belts.
P. Song, J. Tu, I. A. Galkin, J. P. McCollough, G. P. Ginet, W. R. Johnston, Y.-J. Su, M. J. Starks, B. W. Reinisch, U. S. Inan, D. S. Lauben, I. R. Linscott, W. M. Farrell, S. Allgeier, R. Lambour, J. Schoenberg, W. Gillespie, S. Stelmash, K. Roche, A. J. Sinclair, J. C. Sanchez   +20 more
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Space-to-space very low frequency radio transmission in the magnetosphere using the DSX and Arase satellites

Earth, Planets and Space, 2022
Very low frequency (VLF) waves (about 3–30 kHz) in the Earth’s magnetosphere interact strongly with energetic electrons and are a key element in controlling dynamics of the Van Allen radiation belts.
James P. McCollough, Yoshizumi Miyoshi, Gregory P. Ginet, William R. Johnston, Yi-Jiun Su, Michael J. Starks, Yoshiya Kasahara, Hirotsugu Kojima, Shoya Matsuda, Iku Shinohara, Paul Song, Bodo W. Reinisch, Ivan A. Galkin, Umran S. Inan, David S. Lauben, Ivan Linscott, Alan G. Ling, Shawn Allgeier, Richard Lambour, Jon Schoenberg, William Gillespie, Stephen Stelmash, Kevin Roche, Andrew J. Sinclair, Jenny C. Sanchez, Gregory F. Pedinotti, Jarred T. Langhals   +26 more
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Active Flutter Suppression of a Wing Section in a Compressible Flow

Aerospace, 2022
In this paper, a unified method for the computation of the unsteady aerodynamic forces in the Laplace domain for a wing section in subsonic, sonic and supersonic potential flows is presented.
Álvaro Muñoz, Pablo García-Fogeda
doaj   +1 more source

Stormtime dynamics of the global thermosphere and equatorial ionosphere [PDF]

Annales Geophysicae, 2009
During magnetic storms the development of equatorial plasma bubbles (EPBs) and distributions of thermospheric densities are strongly influenced by the histories of imposed magnetospheric electric (εM) fields.
W. J. Burke, W. J. Burke, C. Y. Huang, R. D. Sharma   +3 more
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Aeroelastic Stability of an Aerial Refueling Hose–Drogue System with Aerodynamic Grid Fins

Aerospace, 2023
In this work, the aeroelastic stability of an aerial refueling system is investigated. The system is formed by a classical hose and drogue, and the novelty of our work is the inclusion of a grid fin configuration to improve its stability.
Keyvan Salehi Paniagua, Pablo García-Fogeda, Félix Arévalo   +2 more
doaj   +1 more source

A global climatology for equatorial plasma bubbles in the topside ionosphere [PDF]

Annales Geophysicae, 2006
We have developed a global climatology of equatorial plasma bubble (EPB) occurrence based on evening sector plasma density measurements from polar-orbiting Defense Meteorological Satellite Program (DMSP) spacecraft during 1989-2004. EPBs are irregular
L. C. Gentile, W. J. Burke, F. J. Rich
doaj   +1 more source

Acoustic and Dynamic Response of Unbaffled Plates of Arbitrary Shape

Applied Sciences, 2021
In this study, a method for determining the effects of fluids on the dynamic characteristics of an aerospace structure and the response of the structure when it is excited by the acoustical loads produced during a rocket launch, has been developed ...
Pablo García-Fogeda, Fernando de la Iglesia, Keyvan Salehi   +2 more
doaj   +1 more source

Multi-scale space vehicle component identification [PDF]

2004 International Conference on Image Processing, 2004. ICIP '04., 2005
Vision based vehicle recognition systems have an important role in traffic surveillance. Most of these systems however fail to distinguish vehicles with similar dimensions due to the lack of other details. This paper presents a new scale space method for identifying components of moving vehicles to enable recognition eventually. In the proposed method,
Yung, NHC, Lam, WWL, Pang, CCC
openaire   +3 more sources

Measurement of Optical Rubidium Clock Frequency Spanning 65 Days

Sensors, 2022
Optical clocks are emerging as next-generation timekeeping devices with technological and scientific use cases. Simplified atomic sources such as vapor cells may offer a straightforward path to field use, but suffer from long-term frequency drifts and ...
Nathan D. Lemke, Kyle W. Martin, River Beard, Benjamin K. Stuhl, Andrew J. Metcalf, John D. Elgin   +5 more
doaj   +1 more source