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Journal articles on the topic 'Metecos'

Author: Grafiati

Published: 4 June 2021

Last updated: 2 February 2022

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1

Soares, Fábio Augusto Morales. "Metecos contemporâneos." TRAVESSIA - revista do migrante, no. 58 (August 9, 2007): 13–18. http://dx.doi.org/10.48213/travessia.i58.225.

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Poucos hoje em dia diriam que, a despeito do slogan “nação dos imigrantes”, os Estados Unidos seria um país hospitaleiro: o muro com/contra o México é um argumento eloqüente. Igualmente poucos usariam o termo “hospitalidade” para definir o tratamento do governo francês dado aos imigrantes e descendentes de origem africana (especialmente argelinos) das periferias de Paris, os mesmos que o então ministro do Interior francês, Nicolas Sarkozy, se referiu certa vez como racaille, “escória” (Victor, 2005). Entre os Estados Unidos e a mãe, aliás, existem duas semelhanças aparentemente casuais: primei

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Morales, Fábio Augusto. "Homo Oeconomicos: The Athenian Metics in the XIX and XX Century Historiography." Mare Nostrum (São Paulo) 1, no. 1 (2010): 37. http://dx.doi.org/10.11606/issn.2177-4218.v1i1p37-56.

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Este artigo apresenta um estudo crítico da historiografia sobre os metecos atenienses discutindo os limites e possibilidades de estudos feitos por q uatro autores (Clerc, Whitehead, Román e Baslez). O artigo termina com uma análise de um discurso de Lísias chamado Contra Filon , acerca de um cidadão ateniense que se torna meteco em uma pólis próxima de Atenas, Oropus, durante o regime dos Trinta e a subsequente guerra de restauração democrática; esta análise é aqui apresentada como um exemplo de superação da dicotomia tradicional cidadão (homo politicus)/meteco (homo oeconomicus), mostrando ao

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Virgolino, Mariana Figueiredo. "Historiografia e problematização sobre a 'pólis' e a política dos atenienses." Romanitas - Revista de Estudos Grecolatinos, no. 7 (November 6, 2016): 254. http://dx.doi.org/10.17648/rom.v0i7.14532.

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4

Morales, Fábio Augusto. "A polis e seus outros: os metecos atenienses e a historiografia sobre a polis." Revista do Museu de Arqueologia e Etnologia, no. 18 (December 9, 2008): 183. http://dx.doi.org/10.11606/issn.2448-1750.revmae.2008.89835.

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Este artigo discute o problema da construção historiográfica do conceito de polis, utilizando como estratégia a análise do tratamento historiográfico ao tema da inclusão/exclusão dos estrangeiros residentes (metecos) na polis ateniense clássica. São propostos seis modelos: a cidade religiosa, a cidade consumidoraestamental, a cidade moderna, a cidade de classes, a cidade institucional e a cidade filosófico-existencial; após isto, o artigo discute algumas alternativas historiográficas recentes.

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Bardi, Juan Bautista. "La población en la reflexión jurídico-política de Jenofonte: el rol de los metecos atenienses en Póroi." Synthesis 27, no. 2 (2020): e082. http://dx.doi.org/10.24215/1851779xe082.

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El presente artículo busca explicitar los presupuestos filosóficos que estarían cimentando el tratamiento que Jenofonte otorga a los metecos en los Póroi (II. 1-7). La forma en la que el filósofo ateniense decide incorporar a dicho grupo poblacional a su evaluación económica de la pólis, poniéndolos en la misma balanza que cualquier otro tipo de bien, respondería a una operación de objetivación calibrada por el concepto de “utilidad”, la cual hunde sus raíces en la “teoría de la posesión” desarrollada al comienzo del Económico (I. 1-23).

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Condilo, Camila. "Resenha de A Democracia Ateniense Pelo Avesso: Os Metecos e a Política nos Discursos de Lísias." Mare Nostrum (São Paulo) 8, no. 8 (2017): 208. http://dx.doi.org/10.11606/issn.2177-4218.v8i8p208-211.

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Rocha-Pereira, Maria Helena. "The social status of Greek craftsmenartists." Revista do Museu de Arqueologia e Etnologia, no. 4 (December 19, 1994): 95. http://dx.doi.org/10.11606/issn.2448-1750.revmae.1994.109196.

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Desde que Burckhardt fez a sua conferência pioneira Die Griechen und ihre Künstler, tem havido grandes mudanças na maneira de considerar a questão. Os achados arqueológicos e epigráficos têm demonstrado que em muitos vasos e estátuas arcaicas havia inscrições votivas dos artistas, que podem tomar-se como prova de riqueza e, por outro lado, apareceram diversas contas da construção de edifícios, que mostram que homens livres, metecos e escravos ganhavam o mesmo salário. Embora certas biografias e outros livros antigos tenham, por vezes, de ser postos de parte, pode afirmar-se o valor informativo

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Premkumar, B., K. Chenna Reddy, and G. Yellaiah. "Variation of the meteor count rate and echo height during solar cycle 23 and 24." Proceedings of the International Astronomical Union 13, S340 (2018): 73–74. http://dx.doi.org/10.1017/s1743921318001722.

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AbstractThe meteoroid ablation is an important source of upper atmosphere metal atoms. Many meteoroids ablate between 70 - 110 km and form an ionized plasma trail which is detected by radar technique. It is also known that the ablation heights of the meteors depend on various factors such as velocity, mass, and its composition, etc. The meteor ablation height provides new opportunities to gather information on the neutral atmosphere in the Mesosphere and Lower Thermosphere (MLT) region. In this study, we analysed the 11 years of meteor radar data (2005 - 2015), i.e., descending phase of solar

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9

Mann, Ingrid, Asta Pellinen-Wannberg, and Anders Tjulin. "Meteor studies applying incoherent scatter radar instruments." Proceedings of the International Astronomical Union 10, H16 (2012): 181. http://dx.doi.org/10.1017/s1743921314005353.

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AbstractOne of the interesting aspects of optical meteor studies is that the spectral composition of the brightness reveals information about the element composition of the solid particles that enter Earthfs atmosphere from interplanetary space. Deriving composition from optical spectra requires understanding the entry process during which the entering solid interacts with atmospheric species. This is especially so, because most meteors are observed at altitudes where the mean free path changes from tens of meters to millimeters, that is in the 120 km to 80 km altitude range within the atmosph

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Kozak, P. M., and J. Watanabe. "Meteors with extreme beginning heights from observations with high-sensitivity super-isocon TV systems." Monthly Notices of the Royal Astronomical Society 497, no. 4 (2020): 5550–59. http://dx.doi.org/10.1093/mnras/staa2183.

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ABSTRACT Meteors with extremely high altitudes are considered. Parameters of seven meteors having anomalous beginning heights recorded with highly sensitive super-Isocon TV systems are presented. One 1993 Perseid meteor, one 2001 sporadic meteor and five meteors from the 2002 Leonid storm had beginning heights in the range 135–145 km. The sporadic meteor is used to demonstrate the methods of data processing and observation precision results. The original TV meteor images, photometric calibration curves and meteor light curve are shown. Light curves are shown for the Leonid shower meteors as we

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Subasinghe, Dilini, and Margaret Campbell-Brown. "Luminous Efficiency Estimates of Meteors. II. Application to Canadian Automated Meteor Observatory Meteor Events." Astronomical Journal 155, no. 2 (2018): 88. http://dx.doi.org/10.3847/1538-3881/aaa3e0.

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Younger, P. T., I. Astin, D. J. Sandford, and N. J. Mitchell. "The sporadic radiant and distribution of meteors in the atmosphere as observed by VHF radar at Arctic, Antarctic and equatorial latitudes." Annales Geophysicae 27, no. 7 (2009): 2831–41. http://dx.doi.org/10.5194/angeo-27-2831-2009.

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Abstract. Results are presented of a study of the temporal and spatial variability in meteor count rate observations from three VHF meteor radars. These radar are located in the Arctic (at Esrange, 68° N), in the Antarctic (at Rothera, 68° S) and near the Equator (on Ascension Island, 8° S). It is found that for all three locations there is a strong diurnal cycle in observed hourly meteor counts and the time of maxima and minima in these counts depends on the month of the year. In addition, at high latitude there is a strong annual cycle in observed monthly-mean meteor counts, whereas for the

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13

Kartashova, Anna. "The activity of autumn meteor showers in 2006-2008." Proceedings of the International Astronomical Union 10, H16 (2012): 177. http://dx.doi.org/10.1017/s1743921314005316.

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AbstractThe purpose of meteor observations in INASAN is the study of meteor showers, as the elements of the migrant substance of the Solar System, and estimation of risk of hazardous collisions of spacecrafts with the particles of streams. Therefore we need to analyze the meteor events with brightness of up to 8 m, which stay in meteoroid streams for a long time and can be a hazardous for the spacecraft. The results of our single station TV observations of autumn meteor showers for the period from 2006 to 2008 are presented. The high-sensitive hybrid camera (the system with coupled of the Imag

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BASURAH, HASSAN. "The Recorded Meteors and Meteor Shower in the Islamic History." Journal of King Abdulaziz University-Science 16, no. 1 (2004): 3–17. http://dx.doi.org/10.4197/sci.16-1.12.

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15

Weitzen, Jay A. "Predicting the arrival of meteors useful for meteor burst communication." Radio Science 21, no. 6 (1986): 1009–20. http://dx.doi.org/10.1029/rs021i006p01009.

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16

Hajduková, M. "Meteors in the IAU Meteor Data Center on Hyperbolic Orbits." Earth, Moon, and Planets 102, no. 1-4 (2007): 67–71. http://dx.doi.org/10.1007/s11038-007-9171-5.

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17

Brosch, N., D. Polishook, R. Helled, S. Schijvarg, and M. Rosenkrantz. "Radar and optical leonids." Atmospheric Chemistry and Physics Discussions 4, no. 2 (2004): 1425–47. http://dx.doi.org/10.5194/acpd-4-1425-2004.

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Abstract. We present joint optical-radar observations of meteors collected near the peak of the leonid activity in 2002. We show four examples of joint detections with a large, phased array L-band radar and with intensified video cameras. The general characteristic of the radar-detected optical meteors is that they show the radar detection below the termination of the optical meteor. Therefore, at least some radar events associated with meteor activity are neither head echoes nor trail echoes, but probably indicate the formation of "charged clouds" after the visual meteor is extinguished.

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Brosch, N., D. Polishook, R. Helled, S. Schijvarg, and M. Rosenkrantz. "Radar and optical leonids." Atmospheric Chemistry and Physics 4, no. 4 (2004): 1063–69. http://dx.doi.org/10.5194/acp-4-1063-2004.

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Abstract. We present joint optical-radar observations of meteors collected near the peak of the Leonid activity in 2002. We show four examples of joint detections with a large, phased array L-band radar and with intensified video cameras. The general characteristic of the radar-detected optical meteors is that they show the radar detection below the termination of the optical meteor. Therefore, at least some radar events associated with meteor activity are neither head echoes nor trail echoes, but probably indicate the formation of "charged clouds" after the visual meteor is extinguished.

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19

Vida, Denis, Damir Šegon, Peter S. Gural, et al. "The Global Meteor Network – Methodology and first results." Monthly Notices of the Royal Astronomical Society 506, no. 4 (2021): 5046–74. http://dx.doi.org/10.1093/mnras/stab2008.

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ABSTRACT The Global Meteor Network (GMN) utilizes highly sensitive low-cost CMOS video cameras which run open-source meteor detection software on Raspberry Pi computers. Currently, over 450 GMN cameras in 30 countries are deployed. The main goal of the network is to provide long-term characterization of the radiants, flux, and size distribution of annual meteor showers and outbursts in the optical meteor mass range. The rapid 24-h publication cycle the orbital data will enhance the public situational awareness of the near-Earth meteoroid environment. The GMN also aims to increase the number of

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20

Korotishkin, D. V., S. A. Kalabanov, O. N. Sherstyukov, F. S. Valiullin, and R. A. Ishmuratov. "Meteor Observations at Kazan Federal University (Russia)." Proceedings of the International Astronomical Union 14, A30 (2018): 187. http://dx.doi.org/10.1017/s1743921319004058.

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SummaryThis poster paper described initial results of recent meteor observations in Kazan obtained with a new meteor radar, SKiYMET. Significant improvements in the number of registrations are being recorded, enabling better statistics.Radar observations of meteors have been carried out and archived since the mid-20th Century; at Kazan University (56°N, 49°E) they commenced in 1956, and have continued with only a few interruptions. A quasi-tomographic method (developed in-house in 2000) has been used to determine the coordinates of radiants of meteor showers, and to derive the orbital elements

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Hajduková, Mária. "The occurence of interstellar meteoroids in the vicinity of the Earth." Proceedings of the International Astronomical Union 4, S251 (2008): 347–48. http://dx.doi.org/10.1017/s1743921308021935.

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AbstractIf interstellar meteors are present among the registered meteor orbits, the distribution of the excesses of their heliocentric velocities should correspond to the distribution of radial velocities of close stars. Hence, for the velocity vi = 20 kms−1 of an interstellar meteor (with respect to the Sun) we obtain a heliocentric velocity vH = 46.6 kms−1 of an interstellar meteor arriving at the Earth. Moreover, a concentration of radiants to the Sun's apex should be observed. An analysis of the hyperbolic meteors among the 4581 photographic orbits of the IAU Meteor Data Center showed that

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Campbell-Brown, M. D. "Solar cycle variation in radar meteor rates." Monthly Notices of the Royal Astronomical Society 485, no. 3 (2019): 4446–53. http://dx.doi.org/10.1093/mnras/stz697.

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ABSTRACT 16 yr of meteor radar data from the Canadian Meteor Orbit Radar (CMOR) were used to investigate the link between observed meteor rates and both solar and geomagnetic activity. Meteor rates were corrected for transmitter power and receiver noise, and seasonal effects were removed. A strong negative correlation is seen between solar activity, as measured with the 10.7 cm flux, and observed meteor rates. This lends support to the idea that heating in the atmosphere at times of elevated solar activity changes the scale height and therefore the length and maximum brightness of meteors; a l

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Lindblad, B. A. "Meteor Studies." International Astronomical Union Colloquium 98 (1988): 170–72. http://dx.doi.org/10.1017/s0252921100092733.

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Historically meteor astronomy is one area where amateurs have always been able to make significant contributions. In fact, in the 19th century, it was amateur naked eye and telescopic observations which laid down much of the foundations of meteor astronomy. References to this work can be found in any textbook on meteors. The 19th century observers concentrated on counting meteors, estimating magnitudes and plotting the meteor paths on star maps. Their main interest was to determine hourly rates and shower radiants. An important milestone was Denning’s radiant catalogue (Denning 1882), which in

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Shulga, O., Y. Voloshchuk, S. Kolomiyets, et al. "Present State and Prospects for the Meteor Research in Ukraine." Proceedings of the International Astronomical Union 10, H16 (2012): 184. http://dx.doi.org/10.1017/s1743921314005389.

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AbstractODESSA. Systematical study of the meteor events are being carried out since 1953. In 2003 complete modernization of the observing technique was performed, and TV gmeteor patrolh on the base of WATEC LCL902 cameras was created. @ wide variety of mounts and objectives are used: from Schmidt telescope F = 540 mm, F/D = 2.25 (field of view FOV = (0.68x0.51) deg, star limiting magnitude SLM = 13.5 mag, star astrometric accuracy 1-2 arcsec) up to Fisheye lenses F = 8 mm, F/D = 3.5 (FOV = (36x49) deg, SLM = 7 mag). The database of observations that was collected between 2003 and 2012 consists

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Jiang, X. J., and J. Y. Hu. "High Spatial Resolution Observations of the 1998 and 1999 Leonid Meteors." International Astronomical Union Colloquium 183 (2001): 279–80. http://dx.doi.org/10.1017/s0252921100079070.

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AbstractWe observed the Leonid meteor storm in 1998 and 1999. The light curves extracted from the 2-dimensional images of the bright Leonid meteors clearly show the sub-structures, which are consistent with the generally accepted dustball meteor model (Hawkes & Jones, 1975).

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Golubaev, А., and A. Mozgova. "The first results of meteor phenomena observations using automated video-spectral meteor patrol of V.N. Karazin Kharkiv National University." Bulletin of Taras Shevchenko National University of Kyiv. Astronomy, no. 59 (2019): 36–41. http://dx.doi.org/10.17721/btsnua.2019.59.36-41.

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In 2018, an observation complex (automatic video-spectral meteor patrol (AVSMP)) was designed and constructed at the Institute of Astronomy, V.N. Karazin Kharkiv National University, for obtaining kinematic and physical characteristics of meteor bodies and their spectra. Cameras were tested in astronomical observations mode with the aim to identify the technical capabilities of the device. This paper presents some of the first results of observations conducted with the help of AVSMP. The created observation complex is intended to expand the material, scientific, as well as educational and scie

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Schult, C., G. Stober, J. L. Chau, and R. Latteck. "Determination of meteor-head echo trajectories using the interferometric capabilities of MAARSY." Annales Geophysicae 31, no. 10 (2013): 1843–51. http://dx.doi.org/10.5194/angeo-31-1843-2013.

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Abstract. During the flight of a meteoroid through the neutral atmosphere, the high kinetic energy is sufficient to ionize the meteoric constituents. Radar echoes coming from plasma irregularities surrounding the meteoroids are called meteor-head echoes, and can be detected by HPLA radar systems. Measurements of these echoes were conducted with MAARSY (Middle Atmosphere Alomar Radar System) in December 2010. The interferometric capabilities of the radar system permit the determination of the meteor trajectories within the radar beam with high accuracy. The received data are used to gain inform

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Cardinot, Marcos, and Anderson Namen. "A Mathematical Model for Simulating Meteor Showers." TEMA (São Carlos) 20, no. 1 (2019): 1. http://dx.doi.org/10.5540/tema.2019.020.01.1.

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This paper presents a mathematical model to simulate the trajectory of a meteor as seen by a single observer located anywhere on Earth. Our strategy is to define a new coordinate system, called Radiant Coordinate System, which is centered on the observer and has its z-axis aligned with the radiant. This new coordinate system allows us to describe the meteors’ path by applying a reduced number of equations in a simple solution. We also present a computational implementation of this model, which is developed as a new plug-in of Stellarium, a free and open-source planetarium software. Moreover, w

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Margonis, A., A. Christou, and J. Oberst. "Observations of meteors in the Earth’s atmosphere: Reducing data from dedicated double-station wide-angle cameras." Astronomy & Astrophysics 618 (October 2018): A99. http://dx.doi.org/10.1051/0004-6361/201832927.

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Meteoroids entering the Earth’s atmosphere can be observed as meteors, thereby providing useful information on their formation and hence on their parent bodies. We developed a data reduction software package for double station meteor data from the SPOSH camera, which includes event detection, image geometric and radiometric calibration, radiant and speed estimates, trajectory and orbit determination, and meteor light curve recovery. The software package is designed to fully utilise the high photometric quality of SPOSH images. This will facilitate the detection of meteor streams and studies of

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Janches, D., M. C. Nolan, and M. Sulzer. "Radiant measurement accuracy of micrometeors detected by the Arecibo 430 MHz Dual-Beam Radar." Atmospheric Chemistry and Physics 4, no. 3 (2004): 621–26. http://dx.doi.org/10.5194/acp-4-621-2004.

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Abstract. Precise knowledge of the angle between the meteor vector velocity and the radar beam axis is one of the largest source of errors in the Arecibo Observatory (AO) micrometeor observations. In this paper we study ~250 high signal-to-noise ratio (SNR) meteor head-echoes obtained using the dual-beam 430 MHz AO Radar in Puerto Rico, in order to reveal the distribution of this angle. All of these meteors have been detected first by the radar first side lobe, then by the main beam and finally seen in the side lobe again. Using geometrical arguments to calculate the meteor velocity in the pla

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Kereszturi, Á., V. Barta, I. Bondár, et al. "Review of synergic meteor observations: linking the results from cameras, ionosondes, infrasound and seismic detectors." Monthly Notices of the Royal Astronomical Society 506, no. 3 (2021): 3629–40. http://dx.doi.org/10.1093/mnras/stab1918.

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ABSTRACT The joint evaluation of different meteor observation types supports a better understanding of both meteor phenomena and the terrestrial atmosphere. Two types of examples are presented in this work, linking ionospheric effects to specific meteors, with almost one-third of the meteors that emerged at high altitudes simultaneously recorded with an optical camera. Very few such observations have been realized as yet. With daytime fireballs, the recorded infrasound effect and the atmospheric blast produced shock-wave-related small earthquakes which were identified by a network of ground st

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Watanabe, Jun-Ichi. "RADAR Observations of Leonids in Japan." Highlights of Astronomy 11, no. 2 (1998): 1020. http://dx.doi.org/10.1017/s153929960001950x.

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We are observing meteor showers using the MU radar located at Shigaraki, Japan. This is a Mesosphere, Stratosphere and Troposphere radar, belonging to the Kyoto University, with a frequency and a peak power of 46.5M.ffz and 1MW, respectively. This system is characterized by the versatility of the antenna array. By using four antennas out of 475 Yagi arrays together with four receiver channels, we can observe more than several hundred meteor echoes per hour. The beam applied at the meteor observation is a static “doughnut beam”, which is the rotational symmetrical pattern to the vertical line.

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Singer, W., J. Weiß, and U. von Zahn. "Diurnal and annual variations of meteor rates at the Arctic circle." Atmospheric Chemistry and Physics Discussions 4, no. 1 (2004): 1–20. http://dx.doi.org/10.5194/acpd-4-1-2004.

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Abstract. Meteors are an important source for (a) the metal atoms of the upper atmosphere metal layers and (b) for condensation nuclei, the existence of which are a prerequisite for the formation of noctilucent cloud particles in the polar mesopause region. For a better understanding of these phenomena, it would be helpful to know accurately the annual and diurnal variations of meteor rates. So far, these rates have been little studied at polar latitudes. Therefore we have used the 33 MHz meteor radar of the ALOMAR observatory at 69° N to measure the meteor rates at this location for two full

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Albin, Thomas, Detlef Koschny, Sirko Molau, Ralf Srama, and Björn Poppe. "Analysis of the technical biases of meteor video cameras used in the CILBO system." Geoscientific Instrumentation, Methods and Data Systems 6, no. 1 (2017): 125–40. http://dx.doi.org/10.5194/gi-6-125-2017.

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Abstract. In this paper, we analyse the technical biases of two intensified video cameras, ICC7 and ICC9, of the double-station meteor camera system CILBO (Canary Island Long-Baseline Observatory). This is done to thoroughly understand the effects of the camera systems on the scientific data analysis. We expect a number of errors or biases that come from the system: instrumental errors, algorithmic errors and statistical errors. We analyse different observational properties, in particular the detected meteor magnitudes, apparent velocities, estimated goodness-of-fit of the astrometric measurem

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Kalabanov, Sergei A., Arkadiy V. Karpov, Amir I. Sulimov, Oleg N. Sherstyukov, and Rashid A. Ishmuratov. "Progress of Radar Observations of Meteors in Kazan (Russia) over the Last Sixty Years." Proceedings of the International Astronomical Union 13, S349 (2018): 260–67. http://dx.doi.org/10.1017/s1743921319000401.

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AbstractThis paper presents a brief survey on the history of radar observations of meteors in Kazan from 1950s to present days. Such achievements of Kazan researchers as development and further improvement of original measuring equipment and antenna systems, of observational data processing methods, their contribution to the theory of physics of meteor phenomena and theoretical interpretation of experimental data are highlighted. A particular progress in meteor astronomy has been achieved with a new discrete quasi-tomoghraphic method for faint meteor showers identification that uses goniometer

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Vida, Denis, Peter G. Brown, Margaret Campbell-Brown, Paul Wiegert, and Peter S. Gural. "Estimating trajectories of meteors: an observational Monte Carlo approach – II. Results." Monthly Notices of the Royal Astronomical Society 491, no. 3 (2019): 3996–4011. http://dx.doi.org/10.1093/mnras/stz3338.

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ABSTRACT In the first paper of this series, we examined existing methods of optical meteor trajectory estimation and developed a novel method which simultaneously uses both the geometry and the dynamics of meteors to constrain their trajectories. We also developed a simulator which uses an ablation model to generate realistic synthetic meteor trajectories which we use to test meteor trajectory solvers. In this second paper, we perform simulation validation to estimate radiant and velocity accuracy, which may be achieved by various meteor observation systems as applied to several meteor showers

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Kozak, Pavlo M., Olexander O. Rozhilo, and Yuriy G. Taranukha. "Identification of radiants of low-light-level meteors from double station TV observations during autumnal equinox of 2001 and 2003." Proceedings of the International Astronomical Union 10, H16 (2012): 178. http://dx.doi.org/10.1017/s1743921314005328.

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AbstractResults of double-station TV meteor observations which were carried out during autumnal equinox in 2001 and 2003 are used for the confirmation of existing meteor showers and for a search for probable new micro-showers. Seven existing September showers were confirmed, two of them by meteors from both years. Fourteen new groups were proposed to be considered as new meteor micro-showers. Taking into account similar kinematical parameters two of them can be supposed to be a part of already existing showers.

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Janches, D., M. C. Nolan, and M. Sulzer. "Radiant measurement accuracy of micrometeors detected by the Arecibo 430 MHz dual-beam radar." Atmospheric Chemistry and Physics Discussions 4, no. 1 (2004): 207–25. http://dx.doi.org/10.5194/acpd-4-207-2004.

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Abstract. Precise knowledge of the angle between the meteor vector velocity and the radar beam axis is one of the largest source of errors in the Arecibo Observatory (AO) micrometeor observations. In this paper we study ~250 high signal-to-noise ratio (SNR) meteor head-echoes obtained using the dual-beam 430 MHz AO Radar in Puerto Rico, in order to reveal the distribution of this angle. All of these meteors have been detected first by the radar first side lobe, then by the main beam and finally seen in the side lobe again. Using geometrical arguments to calculate the meteor velocity in the pla

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Castellón, A., and A. J. Castro-Tirado. "AVOIDING MURPHY'S LAW ON DETECTING METEORS." Revista Mexicana de Astronomía y Astrofísica Serie de Conferencias 51 (April 13, 2019): 124–26. http://dx.doi.org/10.22201/ia.14052059p.2019.51.20.

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It is known that when a meteoroid has been imaged by two or more stations, its atmospheric trajectory can be inferred. In addition to this, if the velocity of the meteor has been measured, then the magnitude, the photometric mass and its orbital elements can be computed. Hence, meteor detection networks have a large number of stations. Unfortunately, weak meteors are only imaged by the nearest station, since the brightness decreases with the square of the distance. On the other hand, Murphy’s law can act in the event of brilliant meteors and fireballs: “In a station it was cloudy. In another,

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Shaikh, Muhammad Mubasshir, Govardan Gopakumar, Aisha Abdulla Al-owais, Maryam Essa Sharif, and Ilias Fernini. "Contribution of meteor flux in the occurrence of sporadic-E (Es) layers over the Arabian Peninsula." Annales Geophysicae 39, no. 3 (2021): 471–78. http://dx.doi.org/10.5194/angeo-39-471-2021.

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Abstract. A sporadic-E (Es) layer is generally associated with a thin-layered structure present in the lower ionosphere, mostly consisting of metallic ions. This metallic ion layer is formed when meteors burn in the upper atmosphere, resulting in the deposition of free metal atoms and ions. Many studies have attributed the presence of the Es layer to the metallic ion layer, specifically when the layer is observed during the nighttime. Using data from a network of meteor monitoring towers and a collocated digital ionosonde radar near the Arabian Peninsula, in this paper, we report our observati

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Fujiwara, Yasunori, Masayoshi Ueda, Yasuo Shiba, et al. "Meteor luminosity at 160 km altitude from TV observations for bright Leonid meteors." Geophysical Research Letters 25, no. 3 (1998): 285–88. http://dx.doi.org/10.1029/97gl03766.

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Stokan, E., M. D. Campbell-Brown, P. G. Brown, R. L. Hawkes, M. Doubova, and R. J. Weryk. "Optical trail widths of faint meteors observed with the Canadian Automated Meteor Observatory." Monthly Notices of the Royal Astronomical Society 433, no. 2 (2013): 962–75. http://dx.doi.org/10.1093/mnras/stt779.

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Stokan, E., and M. D. Campbell-Brown. "Transverse motion of fragmenting faint meteors observed with the Canadian Automated Meteor Observatory." Icarus 232 (April 2014): 1–12. http://dx.doi.org/10.1016/j.icarus.2014.01.002.

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Vida, Denis, Peter S. Gural, Peter G. Brown, Margaret Campbell-Brown, and Paul Wiegert. "Estimating trajectories of meteors: an observational Monte Carlo approach – I. Theory." Monthly Notices of the Royal Astronomical Society 491, no. 2 (2019): 2688–705. http://dx.doi.org/10.1093/mnras/stz3160.

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ABSTRACT It has recently been shown by Egal et al. that some types of existing meteor in-atmosphere trajectory estimation methods may be less accurate than others, particularly when applied to high-precision optical measurements. The comparative performance of trajectory solution methods has previously only been examined for a small number of cases. Besides the radiant, orbital accuracy depends on the estimation of pre-atmosphere velocities, which have both random and systematic biases. Thus, it is critical to understand the uncertainty in velocity measurement inherent to each trajectory estim

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Bushuev, F. I., M. P. Kaliuzhnyi, N. A. Kulichenko, et al. "Formation and development of the Ukrainian network of meteor radio observations." Kosmìčna nauka ì tehnologìâ 27, no. 3 (2021): 85–92. http://dx.doi.org/10.15407/knit2021.03.085.

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During the decade of research, the Research Institute “Mykolaiv Astronomical Observatory” (RI “MAO”) developed hardware and software for monitoring, extracting, and calculating the parameters of meteor phenomena using the forward scattering by meteor ionized trail of the signals of over-the-horizon FM-stations broadcasted in the frequency range of 88—108 MHz. This allowed creating a network of observations of meteor phenomena in the radio range, which consists of six stations located in Mykolaiv (three stations), Rivne, Lviv, and Hlukhiv. The stations have identical hardware and software. Yagi

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Pellinen-Wannberg, Asta, Edmond Murad, Noah Brosch, Ingemar Häggström, and Timur Khayrov. "The solar cycle effect on the atmosphere as a scintillator for meteor observations." Proceedings of the International Astronomical Union 5, S263 (2009): 249–52. http://dx.doi.org/10.1017/s1743921310001869.

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AbstractWe discuss using high solar cycle atmospheric conditions as sensors for observing meteors and their properties. High altitude meteor trails (HAMTs) have sometimes been observed with HPLA (High Power Large Aperture) radars. At other times they are not seen. In the absence of systematic studies on this topic, we surmise that the reason might be differing atmospheric conditions during the observations. At EISCAT HAMTs were observed in 1990 and 1991. Very high meteor trails were observed with Israeli L-band radars in 1998, 1999 and 2001. Through the Leonid activity, around the latest perih

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Kolomiyets, S. V. "Meteor Sky in Time-Domain Astronomy." Proceedings of the International Astronomical Union 14, S339 (2017): 318–21. http://dx.doi.org/10.1017/s1743921318002879.

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AbstractMulti-wave astronomy provides a means for researchers to see and ‘hear’ the sky. But that is only part of their perception of the cosmos. The hot handshake of the Universe in the form of a meteor substance burning in the Earth’s atmosphere, sometimes with the precipitation of meteorites threatening the environment, occurs every second. A major present challenge for meteor research is organizing observations and processing existing and new data in order to obtain information in the time domain of meteor astronomy for solving special problems. This poster discusses the concept of the met

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Steel, D. I., and W. J. Baggaley. "Meteoroid Orbits Determined by Southern Hemisphere Radar." International Astronomical Union Colloquium 85 (1985): 299–303. http://dx.doi.org/10.1017/s0252921100084839.

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AbstractA radar meteor orbit facility of novel design has been developed at the University of Canterbury. Synchronous digital noise averaging,impulse suppression and meteor echo recognition using a microprocessor system, along with high gain antennas, allow a limiting radar magnitude of about +13 to be achieved, making this the most sensitive meteor orbit radar to’ date. An exhaustive survey of faint sporadic meteors will be carried out, along with an investigation of the little-known Southern showers. Since the observatory is ideally located with respect to the Eta Aquarid radiant, a programm

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Drolshagen, E., T. Ott, D. Koschny, et al. "Luminous efficiency based on FRIPON meteors and limitations of ablation models." Astronomy & Astrophysics 650 (June 2021): A159. http://dx.doi.org/10.1051/0004-6361/202040204.

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Context. In meteor physics, the luminous efficiency τ is used to convert the meteor’s magnitude to the corresponding meteoroid’s mass. However, a lack of sufficiently accurate verification methods or adequate laboratory tests mean that discussions around this parameter are a subject of controversy. Aims. In this work, we aim to use meteor data obtained by the Fireball Recovery and InterPlanetary Observation to calculate the luminous efficiencies of the recorded meteors. We also show the limitations of the methods presented herein. Methods. Deceleration-based formulas were used to calculate the

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Hofman, J., D. Brink, P. Breure, and J. P. van der Hoek. "Fouling and accuracy drift of water meters." Water Supply 2, no. 4 (2002): 129–36. http://dx.doi.org/10.2166/ws.2002.0130.

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In 1997, the Amsterdam City Council decided that water meters should be installed in every house connection. With this decision Amsterdam Water Supply (AWS) was faced with the challenge to install approximately 475,000 water meters and adapt its organisation to fulfil all customer services. Among the technical challenges was the selection of the type of meter to be used. Since AWS had only limited experience with water meters, a selection study was conducted. The main focus of this study was to estimate the life time, robustness, and accuracy drift of meters with different measuring principles

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