Download or read book Ionization Associated with Hypervelocity Impact written by Joseph Fred Friichtenicht and published by . This book was released on 1963 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Note written by and published by . This book was released on 1963 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book PROCEEDINGS OF THE SIXTH SYMPOSIUM ON HYPERVELOCITY IMPACT CLEVELAND OHIO APRIL 30 MAY 1 2 1963 SPONSORED BY U S ARMY U S AIR FORCE U S NAVY VOLUME 2 written by and published by . This book was released on 1963 with total page 371 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents: Hypervelocity cratering data and a crater-depth model for the regime of fluidity, Fluid impact craters and hypervelocity -high-velocity impact experiments in metals and rocks, Energy balances in hypervelocity penetration, The partition of energy for hypervelocity impact craters formed in rock, Transient observations of crater formation in semi-infinite targets, Influence of target strength of hypervelocity crater formation in aluminum, Some phenomena associated with impacts into aluminum, Particle-solid impact phenomena, Investigation of the impact of copper filaments into aluminum targets at velocities to 16,000 feet per second, Ionization associated with hypervelocity impact, Investigation of impact flash at low ambient pressures, An investigation of the phenomena of impact flash and its potential use as a hit detection and target discrimination technique, Summary of theoretical and experimental studies of crater formation.
Download or read book Proceedings of the Sixth Symposium on Hypervelocity Impact written by Symposium on Hypervelocity Impact and published by . This book was released on 1963 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hypervelocity Impacts in Space and Planetology written by J. A. M. McDonnell and published by Elsevier Science & Technology. This book was released on 1997 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Paperback. This publication contains 36 papers taken from three symposia of COSPAR Scientific Commission B, which took place during the Thirty-first COSPAR Scientific Assembly, held in Birmingham, UK, during July 1996. The major areas covered by the symposia and which form this volume are as follows: the particulate space environment, problems in comparative planetology, and laboratory investigations relevant to planetology. Papers on the particulate space environment reflect advances in evaluation of the space environment, the deeper understanding of hypervelocity impact phenomena, and hold interest for the understanding of the natural environment and space debris. Papers on problems in comparative planetology investigate differences in impact melting on the surfaces of different planets, the geology of Alba Petra on Mars and attempts to interpret the geology of that region in terms of the geology of corona structures found on Venus. Papers concerning la
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Detection and Analysis of the Electromagnetic Pulse from Hypervelocity Impact Plasma Expansion written by Theresa Lynn Johnson and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Hypervelocity dust particles, including meteoroids and space debris, routinely impact spacecraft and produce plasmas that are initially dense (10^25/m^3), but rapidly expand into the surrounding vacuum. This research was the first to detect radio frequency (RF) emission associated with electromagnetic pulses (EMPs) from hypervelocity dust particle impacts in ground-based experiments. These micro particles that produced RF are 15 orders of magnitude less massive than previously observed. We find that one mechanism for EMP production is the result of the growth of the unstable Weibel mode in the plasma and that the EMP detection rate is strongly dependent on impact speed and on the electrical charge conditions at the impact surface. This mode grows from a plasma temperature anisotropy driven by the impact ionization process combined with the external electric field. Upon expansion, the Weibel mode grows, producing RF emission within nanoseconds. In particular, impacts of the fastest particles (speed> 15 km/s) occurring under spacecraft charging conditions representative of high geomagnetic activity are the most likely to produce RF emission. The sensor design and analysis that led to this discovery is discussed. This phenomenon may provide a source for unexplained RF measurements and satellite electrical anomalies.
Download or read book Evolutionary and Physical Properties of Meteoroids written by Curtis L. Hemenway and published by . This book was released on 1973 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Government Research Reports written by and published by . This book was released on 1964 with total page 1416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Scientific and Technical Reports written by United States. National Aeronautics and Space Administration Scientific and Technical Information Division and published by . This book was released on 1964 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Selected Listing of NASA Scientific and Technical Reports for written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Division and published by . This book was released on 1963 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Keywords Index to U S Government Technical Reports written by and published by . This book was released on 1962 with total page 1160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Keywords Index to U S Government Technical Reports permuted Title Index written by United States. Department of Commerce. Office of Technical Services and published by . This book was released on 1963 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalog of United States Government Publications written by United States. Superintendent of Documents and published by . This book was released on 1963 with total page 1304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Galileo Mission written by C.T. Russell and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 613 pages. Available in PDF, EPUB and Kindle. Book excerpt: The articles in this volume are a document of the Galileo mission to Jupiter. The Mission Overview is the first article; the second is a description of the design of the very complex spacecraft trajectory in relation to the scientific objects. Subsequent articles describe the various investigations planned by the scientific groups. These are divided in three groups: the Probe, the Magnetospheric Experiments, and the Remote Sensing and Radio Investigations.
Download or read book A Selected Listing of NASA Scientific and Technical Reports for 1966 written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Division and published by . This book was released on 1967 with total page 2084 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dusty Plasma Effects in Hypervelocity Impacts written by Gil Shohet and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Meteoroids routinely impact bodies in space, such as spacecraft and small planetary bodies. Orbital debris also threaten spacecraft near Earth. These hypervelocity impacts occur at velocities of a few to tens of km/s, and the rapid conversion of kinetic energy to internal and thermal energy upon impact leads to fracturing, melting, vaporization, and ionization, producing a dense plasma. As the plasma expands from the impact crater, oscillations and instabilities can generate electromagnetic emissions in the radio frequency (RF) range and a broadband electromagnetic pulse (EMP). Moreover, condensed phase (solid and liquid) ejecta, referred to as dust, may acquire a surface charge due to interactions with the plasma, resulting in a dusty plasma. Hypervelocity impact plasmas generated by ground-based light gas gun impacts, which overlap the mass and velocity range of orbital debris, have been described as dusty for decades. Experimental plasma data and hydrodynamic simulations suggest dust charging as a possible explanation for anomalous plasma measurements. The degree of charge attachment and effect on plasma observations, however, remains unquantified. This thesis makes the first quantitative estimate of charge attachment in light gas gun impacts. We use thin-film witness plates to produce the first measurements of microscopic ejecta 1-50 microns in diameter generated by light gas gun impacts on aluminum and powdered regolith simulant targets, which serve as analogues for spacecraft and small solar system bodies, respectively. We then extend dust charging models based on orbital motion limited (OML) theory to the impact environment and build a novel semi-analytic model for dust charging and dynamics across the many orders of magnitude of space, time, and density spanned by the expanding plasma. Combining ejecta measurements, empirical and analytic models for the expanding plasma, and the dust evolution model enables predictions of the charge state of impact debris throughout the expansion. We quantify and propagate experimental and model uncertainties and use stochastic methods to produce bounded estimates of quantities of interest. This work led to a number of key findings. First, extrapolations from measurements of macroscopic ejecta poorly predict the flux of microscopic debris, and the computed particle size distribution predicts a flux of dust to the co-located plasma sensors that agrees in order of magnitude with the number of impulses, indicative of dust, in the plasma signals. Second, the dust charging model suggests that enough electrons attach to ejecta that dusty plasma phenomena are likely. These may affect electromagnetic emissions generated by hypervelocity impacts, especially on granular bodies, such as asteroids and comets. Third, the evolution model, with reasonable inputs, predicts similar arrival times and a surface charge that agrees in sign with experimental plasma measurements. Thermionic emission by hot debris can explain the observation of positively charged dust in impacts on granular regolith analogues. Finally, the ambient environment plays an important role in the charging and evolution of ejecta, and the neutral background present in many light gas gun facilities augments the tendency of debris to charge positively.
