Academic literature on the topic 'Antarctic Search for Meteorites Project'

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Journal articles on the topic "Antarctic Search for Meteorites Project"

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Apostolopoulos, Dimitrios S., Michael D. Wagner, Benjamin N. Shamah, Liam Pedersen, Kimberly Shillcutt, and William L. Whittaker. "Technology and Field Demonstration of Robotic Search for Antarctic Meteorites." International Journal of Robotics Research 19, no. 11 (November 2000): 1015–32. http://dx.doi.org/10.1177/02783640022067940.

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Love, Stanley G., and Ralph P. Harvey. "Crew autonomy for deep space exploration: Lessons from the Antarctic Search for Meteorites." Acta Astronautica 94, no. 1 (January 2014): 83–92. http://dx.doi.org/10.1016/j.actaastro.2013.08.001.

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Wilson, John W., Liam A. Marsh, Wouter Van Verre, Michael C. Rose, Geoffrey Evatt, Andrew R. D. Smedley, and Anthony J. Peyton. "Design and construction of a bespoke system for the detection of buried, iron-rich meteorites in Antarctica." Antarctic Science 32, no. 1 (January 22, 2020): 58–69. http://dx.doi.org/10.1017/s0954102019000531.

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AbstractIron-rich meteorites are significantly underrepresented in collection statistics from Antarctica. This has led to a hypothesis that there is a sparse layer of iron-rich meteorites hidden below the surface of the ice, thereby explaining the apparent shortfall. As standard Antarctic meteorite collecting techniques rely upon a visual surface search approach, the need has thus arisen to develop a system that can detect iron objects under a few tens of centimetres of ice, where the expected number density is of the order one per square kilometre. To help answer this hypothesis, a large-scale pulse induction metal detector array has been constructed for deployment in Antarctica. The metal detector array is 6 m wide, able to travel at 15 km h-1 and can scan 1 km2 in ~11 hours. This paper details the construction of the metal detector system with respect to design criteria, notably the ruggedization of the system for Antarctic deployment. Some preliminary results from UK and Antarctic testing are presented. We show that the system performs as specified and should reach the pre-agreed target of the detection of a 100 g iron meteorite at 300 mm when deployed in Antarctica.
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Crouzet, N., K. Agabi, A. Blazit, S. Bonhomme, Y. Fanteï-Caujolle, F. Fressin, T. Guillot, et al. "ASTEP South: An Antarctic Search for Transiting Planets around the celestial South pole." Proceedings of the International Astronomical Union 4, S253 (May 2008): 336–39. http://dx.doi.org/10.1017/s1743921308026586.

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AbstractASTEP South is the first phase of the ASTEP project that aims to determine the quality of Dome C as a site for future photometric searches for transiting exoplanets and discover extrasolar planets from the Concordia base in Antarctica. ASTEP South consists of a front-illuminated 4k × 4k CCD camera, a 10 cm refractor, and a simple mount in a thermalized enclosure. A double-glass window is used to reduce temperature variations and the associated turbulence on the optical path. The telescope is fixed and observes a 4° × 4° field of view centered on the celestial South pole. With this design, A STEP South is very stable and observes with low and constant airmass, both being important issues for photometric precision. We present the project, we show that enough stars are present in our field of view to allow the detection of one to a few transiting giant planets, and that the photometric precision of the instrument should be a few mmag for stars brighter than magnitude 12 and better than 10 mmag for stars of magnitude 14 or less.
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Ginzburg, V. L., E. L. Feinberg, N. G. Polukhina, N. I. Starkov, and V. A. Tsarev. "Problems and horizons of the search for tracks of heavy and superheavy nuclei in olivine crystals from meteorites (OLIMPIYA project)." Doklady Physics 50, no. 6 (June 2005): 283–85. http://dx.doi.org/10.1134/1.1958116.

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Goswami, J. N., and J. D. Macdougall. "Devendra Lal. 14 February 1929—1 December 2012." Biographical Memoirs of Fellows of the Royal Society 70 (March 3, 2021): 263–81. http://dx.doi.org/10.1098/rsbm.2020.0047.

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Devendra Lal was an Indian nuclear physicist who began his career studying particle physics while a student at the Tata Institute of Fundamental Research (TIFR) in Bombay, using tracks in nuclear emulsions to study cosmic ray particles and their interactions. He soon moved on to the search for radionuclides produced in the atmosphere by cosmic ray bombardment, independently (with colleagues) discovering radioisotopes of Be, P and Si and using them as geophysical tracers for atmospheric, meteorological and oceanographic processes. His career revolved principally around multiple aspects of cosmic rays, employing theory and experiment to examine their flux, chemical composition and energy spectrum, both at present and in the past through (for example) studies of particle tracks in the minerals of meteorites and lunar samples. He played a major role in developing approaches for the use of terrestrial cosmic-ray-produced isotopes as dating tools and tracers for a wide range of Earth processes, from biological cycles in the ocean to landscape evolution and ice ablation in the Antarctic. At various stages of his career Lal was professor at TIFR and led the geophysics group there, was professor and director of the Physical Research Laboratory in Ahmedabad, India, and was professor at the Scripps Institution of Oceanography, University of California San Diego. He was elected fellow of numerous scientific organizations and academies internationally, and was the recipient of many scientific awards and prizes.
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Crouzet, N., E. Chapellier, T. Guillot, D. Mékarnia, A. Agabi, Y. Fanteï-Caujolle, L. Abe, et al. "Four winters of photometry with ASTEP South at Dome C, Antarctica." Astronomy & Astrophysics 619 (November 2018): A116. http://dx.doi.org/10.1051/0004-6361/201732565.

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Context. Dome C in Antarctica is a promising site for photometric observations thanks to the continuous night during the Antarctic winter and favorable weather conditions. Aims.We developed instruments to assess the quality of this site for photometry in the visible and to detect and characterize variable objects through the Antarctic Search for Transiting ExoPlanets (ASTEP) project. Methods. Here, we present the full analysis of four winters of data collected with ASTEP South, a 10 cm refractor pointing continuously toward the celestial south pole. We improved the instrument over the years and developed specific data reduction methods. Results. We achieved nearly continuous observations over the winters. We measure an average sky background of 20 mag arcsec−2 in the 579–642 nm bandpass. We built the lightcurves of 6000 stars and developed a model to infer the photometric quality of Dome C from the lightcurves themselves. The weather is photometric 67.1 ± 4.2% of the time and veiled 21.8 ± 2.0% of the time. The remaining time corresponds to poor quality data or winter storms. We analyzed the lightcurves of σ Oct and HD 184465 and find that the amplitude of their main frequency varies by a factor of 3.5 and 6.7 over the four years, respectively. We also identify 34 new variable stars and eight new eclipsing binaries with periods ranging from 0.17 to 81 days. Conclusion. The phase coverage that we achieved with ASTEP South is exceptional for a ground-based instrument and the data quality enables the detection and study of variable objects. These results demonstrate the high quality of Dome C for photometry in the visible and for time series observations in general.
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Lei, Yang, Alex S. Gardner, and Piyush Agram. "Processing methodology for the ITS_LIVE Sentinel-1 ice velocity products." Earth System Science Data 14, no. 11 (November 22, 2022): 5111–37. http://dx.doi.org/10.5194/essd-14-5111-2022.

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Abstract. The NASA MEaSUREs Inter-mission Time Series of Land Ice Velocity and Elevation (ITS_LIVE) project seeks to accelerate understanding of critical glaciers and ice sheet processes by providing researchers with global, low-latency, comprehensive and state of the art records of surface velocities and elevations as observed from space. Here we describe the image-pair ice velocity product and processing methodology for ESA Sentinel-1 radar data. We demonstrate improvements to the core processing algorithm for dense offset tracking, “autoRIFT”, that provide finer resolution (120 m instead of the previous 240 m used for version 1) and higher accuracy (20 % to 50 % improvement) data products with significantly enhanced computational efficiency (>2 orders of magnitude) when compared to earlier versions and the state of the art “dense ampcor” routine in the JPL ISCE software. In particular, the disparity filter is upgraded for handling finer grid resolution with overlapping search chip sizes, and the oversampling ratio in the subpixel cross-correlation estimation is adaptively determined for Sentinel-1 data by matching the precision of the measured displacement based on the search chip size used. A novel calibration is applied to the data to correct for Sentinel-1A/B subswath and full-swath dependent geolocation biases caused by systematic issues with the instruments. Sentinel-1 C-band images are affected by variations in the total electron content of the ionosphere that results in large velocity errors in the azimuth (along-track) direction. To reduce these effects, slant range (line of sight or LOS) velocities are used and accompanied by LOS parameters that support map coordinate (x/y) velocity inversion from ascending and descending slant range offset measurements, as derived from two image pairs. After the proposed correction of ionosphere errors, the uncertainties in velocities are reduced by 9 %–61 %. We further validate the ITS_LIVE Version 2 Sentinel-1 image-pair products, with 6-year time series composed of thousands of epochs, over three typical test sites covering the globe: the Jakobshavn Isbræ Glacier of Greenland, Pine Island Glacier of the Antarctic, and Malaspina Glacier of Alaska. By comparing with other similar products (PROMICE, FAU, and MEaSUREs Annual Antarctic Ice Velocity Map products), as well as other ITS_LIVE version 2 products from Landsat-8 and Sentinel-2 data, we find an overall variation between products around 100 m yr−1 over fast-flowing glacier outlets, where both mean velocity and variation are on the order of km yr−1, and increases up to 300–500 m yr−1 (3 %–6 %) for the fastest Jakobshavn Isbræ Glacier. The velocity magnitude uncertainty of the ITS_LIVE Sentinel-1 products is calculated to be uniformly distributed around 60 m yr−1 for the three test regions investigated. The described product and methods comprise the MEaSUREs ITS_LIVE Sentinel-1 Image-Pair Glacier and Ice Sheet Surface Velocities: version 2 (DOI: https://doi.org/10.5067/0506KQLS6512, Lei et al., 2022).
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Wu, C. J., I. G. Usoskin, N. Krivova, G. A. Kovaltsov, M. Baroni, E. Bard, and S. K. Solanki. "Solar activity over nine millennia: A consistent multi-proxy reconstruction." Astronomy & Astrophysics 615 (July 2018): A93. http://dx.doi.org/10.1051/0004-6361/201731892.

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Aims.The solar activity in the past millennia can only be reconstructed from cosmogenic radionuclide proxy records in terrestrial archives. However, because of the diversity of the proxy archives, it is difficult to build a homogeneous reconstruction. All previous studies were based on individual, sometimes statistically averaged, proxy datasets. Here we aim to provide a new consistent multi-proxy reconstruction of the solar activity over the last 9000 yr, using all available long-span datasets of10Be and14C in terrestrial archives.Methods.A new method, based on a Bayesian approach, was applied for the first time to solar activity reconstruction. A Monte Carlo search (using theχ2statistic) for the most probable value of the modulation potential was performed to match data from different datasets for a given time. This provides a straightforward estimate of the related uncertainties. We used six10Be series of different lengths (from 500–10 000 yr) from Greenland and Antarctica, and the global14C production series. The10Be series were resampled to match wiggles related to the grand minima in the14C reference dataset. The stability of the long data series was tested.Results.The Greenland Ice-core Project (GRIP) and the Antarctic EDML (EPICA Dronning Maud Land)10Be series diverge from each other during the second half of the Holocene, while the14C series lies in between them. A likely reason for the discrepancy is the insufficiently precise beryllium transport and deposition model for Greenland, which leads to an undercorrection of the GRIP series for the geomagnetic shielding effect. A slow 6–7 millennia variability with lows at ca. 5500 BC and 1500 AD in the long-term evolution of solar activity is found. Two components of solar activity can be statistically distinguished: the main component, corresponding to the “normal” moderate level, and a component corresponding to grand minima. A possible existence of a component representing grand maxima is indicated, but it cannot be separated from the main component in a statistically significant manner.Conclusions.A new consistent reconstruction of solar activity over the last nine millennia is presented with the most probable values of decadal sunspot numbers and their realistic uncertainties. Independent components of solar activity corresponding to the main moderate activity and the grand-minimum state are identified; they may be related to different operation modes of the dynamo.
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"Workshop on Antarctic Meteorites: Search, Recovery, and Classification." Meteoritics & Planetary Science 43, S7 (July 2008): A179—A192. http://dx.doi.org/10.1111/j.1945-5100.2008.tb00712.x.

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Books on the topic "Antarctic Search for Meteorites Project"

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Cassidy, W. A. Meteorites, ice, and Antarctica. Cambridge: Cambridge University Press, 2003.

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Cassidy, W. A. Meteorites, Ice, and Antarctica. Cambridge University Press, 2003.

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Meteorites, Ice, and Antarctica. Cambridge University Press, 2003.

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Cassidy, William A. Meteorites, Ice, and Antarctica: A Personal Account. Cambridge University Press, 2003.

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Cassidy, William A. Meteorites, Ice, and Antarctica: A Personal Account. Cambridge University Press, 2009.

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Antarctic meteorite location and mapping project (AMLAMP): Antarctic meteorite location map series explanatory text and user's guide to AMPLAMP data. Houston, Texas: Lunar and Planetary Institute, 1993.

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Brian, Fessler, Cassidy W. A, and United States. National Aeronautics and Space Administration., eds. Antarctic meteorite location and mapping project (AMLAMP): Antarctic meteorite location map series explanatory text and user's guide to AMPLAMP data. Houston, Texas: Lunar and Planetary Institute, 1993.

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Government, U. S., National Aeronautics and Space Administration (NASA), and World Spaceflight News (WSN). NASA Space Technology Report: The Antarctic Search for Meteorites - a Model for Deep Space Exploration, an Astronaut's Report Comparing ANSMET to Space Flight with Recommendations. Independently Published, 2018.

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Book chapters on the topic "Antarctic Search for Meteorites Project"

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Harvey, Ralph P., John Schutt, and Jim Karner. "Fieldwork Methods of the U.S. Antarctic Search for Meteorites Program." In Special Publications, 23–41. Hoboken, NJ: John Wiley & Sons, Inc, 2014. http://dx.doi.org/10.1002/9781118798478.ch2.

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Marvin, Ursula B. "The Origin and Early History of the U.S. Antarctic Search for Meteorites Program (ANSMET)." In Special Publications, 1–22. Hoboken, NJ: John Wiley & Sons, Inc, 2014. http://dx.doi.org/10.1002/9781118798478.ch1.

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Weintraub, David A. "Hot Potato." In Life on Mars, 161–85. Princeton University Press, 2020. http://dx.doi.org/10.23943/princeton/9780691209258.003.0011.

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This chapter refers to Roberta Score, the curator of the Antarctic Meteorite Laboratory at the Johnson Space Center in Texas, who was hunting for meteorites in Antarctica during the last days of 1984. It discusses the National Science Foundation's Antarctic Search for Meteorites (ANSMET) program, which excavated pristine meteorites collected on the blue ice of Antarctica that had fallen thousands or millions of years ago. It also describes the meteorites as a scientific windfall for the scientific community and worth the difficult work involved in obtaining them. The chapter focuses on the meteorite that was discovered by Score and was named ALH 84001. It points out that the greenish color of ALH 84001 was so unusual that it became a high-priority meteorite when it arrived in Houston.
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Eppler, Dean B. "Analysis of Antarctic logistics and operations data: Results from the Antarctic Search for Meteorites (ANSMET), austral summer season, 2002–2003, with implications for planetary surface operations." In Analogs for Planetary Exploration. Geological Society of America, 2011. http://dx.doi.org/10.1130/2011.2483(06).

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Conference papers on the topic "Antarctic Search for Meteorites Project"

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Gerber, Hans W., and Gu¨nther F. Clauss. "MABEL: Recovery Operation of the First Long-Term Heavy Benthic Laboratory in the Deep Sea of Antarctica." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-80251.

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This paper deals with the recovery operation of the bottom station MABEL (Multidisciplinary Antarctic Benthic Laboratory) with a mass of 1,7 tons in air that has been deployed in December 2005 from the German research vessel Polarstern, by means of a release transponder at a water depth of 1850 m, close to the shelf ice edge near the German polar research station Neumayer. The project is run under the umbrella of the Italian Antarctic programme by the project leader INGV (Istituto Nazionale di Geofisica i Vulcanlogia) /1/. During the cruise ANT XXV-2 of the Polarstern (organized by the German AWI - Alfred-Wegner-Institut) the German partners TFH Berlin and TU Berlin have been participating with their module MODUS (Mobile Docker for Underwater Sciences) to recover the station from the deep sea. The special circumstances in the Antarctic sea — the ice coverage of the deployment area and the tight time schedule for the operation — make such an operation quite delicate. This paper describes the special technology used both for the station and the recovery module. The operation itself will be discussed, showing the data of operation using a combined tracking of GPS-data and the underwater positioning system Posidonia of the Polarstern. The special circumstance of the operation was the inadequate data of the position achieved during the deployment, so that a safe search strategy had to be found. The mission ended successfully on December 16th, 2008 with the recovery of the MABEL station. Simulations for the system behaviour will be shown.
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