Relevant bibliographies by topics / Ionograms

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Ionograms'

Author: Grafiati
Published: 4 June 2021
Last updated: 15 February 2022

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Journal articles on the topic "Ionograms"

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Mochalov, Vladimir, and Anastasia Mochalova. "Extraction of ionosphere parameters in ionograms using deep learning." E3S Web of Conferences 127 (2019): 01004. http://dx.doi.org/10.1051/e3sconf/201912701004.

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Based on a new developed author’s method for recognition traces of reflections from different layers of the ionosphere in ionograms, the ionosphere parameters are extracted. The method is based on the use of deep neural networks (DNN). The rules for extracting the ionosphere parameters in ionograms are given. Based on the results obtained by the authors, an intelligent support system for ionogram analysis is being developed.
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Ларюнин, Олег, Oleg Laryunin, Алексей Подлесный, Aleksey Podlesnyi, Олег Романовский, and Oleg Romanovskii. "Interpretation of oblique-incidence ionograms under the assumption of a spherically stratified ionosphere." Solnechno-Zemnaya Fizika 1, no. 4 (2015): 66–71. http://dx.doi.org/10.12737/13388.

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Oblique sounding ionograms show that an ionogram trace can be of nose shape with typical multipath for which the maximum corresponds to maximum usable frequency. However, ionograms obtained from sounding at short paths are of classical type and do not differ from vertical sounding ionograms in appearance. On the basis of ray tracing in isotropic medium we examined changes in ionogram structure when varying the ground range. It is shown that in a stratified medium, multipath can take place at any nonzero ground range though at short paths, to resolve multipathing in an experiment seems to be im
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Ларюнин, Олег, and Oleg Laryunin. "Numerical synthesis of ionograms in horizontally inhomogeneous ionosphere on the basis of compound parabolic layer model." Solar-Terrestrial Physics 2, no. 3 (2016): 74–86. http://dx.doi.org/10.12737/22286.

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Characteristic U-shaped traces (cusps) on ionograms have been identified as off-angle echoes from sloping electron density contours caused by the presence of traveling ionospheric disturbances (TIDs). Temporal evolution of the cusps is associated with horizontal drift of the disturbances.
 A potential for reducing calculation time in numerical synthesis of vertical ionograms is under discussion. 
 Since numerical ray tracing is computationally intensive, we have developed simplified formulation for this study. The suggested model of compound parabolic layer allows us to analytically
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Ларюнин, Олег, and Oleg Laryunin. "Numerical synthesis of ionograms in horizontally inhomogeneous ionosphere on the basis of compound parabolic layer model." Solnechno-Zemnaya Fizika 2, no. 3 (2016): 52–58. http://dx.doi.org/10.12737/18656.

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Characteristic U-shaped traces cusps on ionograms have been identified as off-angle echoes from sloping electron density contours caused by the presence of traveling ionospheric disturbances (TIDs). Dynamics of the cusps is associated with horizontal drift of the disturbances. A potential for reducing calculation time in numerical synthesis of vertical ionograms is under discussion. Since numerical ray tracing is expensive in terms of computer time, we have developed simplified formulation for this study. The suggested model of compound parabolic layer allows us to analytically calculate ray p
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Zhao, J. J., C. Zhou, G. B. Yang, et al. "A new inversion algorithm for backscatter ionogram and its experimental validation." Annales Geophysicae 32, no. 4 (2014): 465–72. http://dx.doi.org/10.5194/angeo-32-465-2014.

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Abstract. Oblique backscatter sounding is a powerful tool for detecting and monitoring the ionosphere continuously at a remote distance. High-frequency (HF) backscatter ionograms provide the amplitudes of backscatter signals with respect to group path or time delay against operating frequency. Application of inversion algorithm to a backscatter ionogram can extract useful information regarding the ionospheric electron density along the propagation paths. The present study proposes a new inversion algorithm on basis of simulated annealing method to acquire the leading edge of sweep-frequency io
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Yusupov, Kamil, John Mathews, Takashi Maruyama, et al. "AMPLITUDE VARIATIONS OF THE REFLECTED SIGNAL DURING VERTICAL SOUNDING OF THE IONOSPHERE AT MIDDLE LATITUDES." Solnechno-Zemnaya Fizika 6, no. 3 (2020): 88–98. http://dx.doi.org/10.12737/szf-63202010.

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In this paper, we discuss the main types of quasiperiodic variations in amplitudes of a reflected signal during vertical sounding of the ionosphere at middle latitudes. The initial experimental data is vertical sounding ionograms obtained by the Cyclone ionosonde. The ionosonde is located in Kazan (59°, 49°) and in standard mode allows us to receive one ionogram per minute. In the analysis, methods are used to visualize a large flow of ionograms in the form of final summary maps of the state of the ionosphere (A-, H-, As-maps). We give typical examples of quasiperiodic variations in amplitudes
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Yusupov, Kamil, John Mathews, Takashi Maruyama, et al. "AMPLITUDE VARIATIONS OF THE REFLECTED SIGNAL DURING VERTICAL SOUNDING OF THE IONOSPHERE AT MIDDLE LATITUDES." Solar-Terrestrial Physics 6, no. 3 (2020): 72–80. http://dx.doi.org/10.12737/stp-63202010.

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In this paper, we discuss the main types of quasiperiodic variations in amplitudes of a reflected signal during vertical sounding of the ionosphere at middle latitudes. The initial experimental data is vertical sounding ionograms obtained by the Cyclone ionosonde. The ionosonde is located in Kazan (59°, 49°) and in standard mode allows us to receive one ionogram per minute. In the analysis, methods are used to visualize a large flow of ionograms in the form of final summary maps of the state of the ionosphere (A-, H-, As-maps). We give typical examples of quasiperiodic variations in amplitudes
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Yusupov, Kamil M., and Nataliya V. Bakhmetieva. "Sporadic E Layer with a Structure of Double Cusp in the Vertical Sounding Ionogram." Atmosphere 12, no. 9 (2021): 1093. http://dx.doi.org/10.3390/atmos12091093.

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In this study, we analyzed a large number of vertical sounding ionograms, obtained by the mid-latitude Cyclone ionosonde (55.85° N; 48.8° E) of Kazan (Volga Region) Federal University, which operates in a rapid-run mode of ionograms (1 ionogram per minute). Ionograms with a sporadic E layer type c, which have an unusual double cusp on the trace from the sporadic layer, were found among them. We attempted to simulate this unusual double cusp trace shape. Model calculations were performed to clarify the reasons for the appearance of the double cusp and to determine the shape of the lower part of
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Zhbankov, G. A. "DEVELOPMENT OF METHODS OF CALCULATIONS OF N(h)-PROFILES OF THE IONOSPHERE BASED ON THE DATA OF IONOGRAMS OF VERTICAL SENSING." RADIO COMMUNICATION TECHNOLOGY, no. 46 (September 30, 2020): 7–18. http://dx.doi.org/10.33286/2075-8693-2020-46-7-18.

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Two new methods are proposed for calculating the N(h)-profiles of the ionosphere from the data of vertical sounding ionograms based on numerical trajectory calculations in a mag-netically active medium. It has been shown experimentally that the model ionogram calculat-ed from the profiles obtained by both described methods is almost exactly consistent with the experimental one. Depending on the task, you can specify the choice of method. With some modification, they can be used as an automatic procedure for calculating N(h)- profiles.
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Mochalov, Vladimir, and Anastasia Mochalova. "Application of deep learning methods to predict ionosphere parameters in real time." E3S Web of Conferences 196 (2020): 02007. http://dx.doi.org/10.1051/e3sconf/202019602007.

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In this paper, the previously obtained results on recognition of ionograms using deep learning are expanded to predict the parameters of the ionosphere. After the ionospheric parameters have been identified on the ionogram using deep learning in real time, we can predict the parameters for some time ahead on the basis of the new data obtained Examples of predicting the ionosphere parameters using an artificial recurrent neural network architecture long short-term memory are given. The place of the block for predicting the parameters of the ionosphere in the system for analyzing ionospheric dat
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Dissertations / Theses on the topic "Ionograms"

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Ippolito, Alessandro <1977&gt. "Oblique ionograms automatic scaling and eikonal based ray tracing." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/6888/.

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A method for automatic scaling of oblique ionograms has been introduced. This method also provides a rejection procedure for ionograms that are considered to lack sufficient information, depicting a very good success rate. Observing the Kp index of each autoscaled ionogram, can be noticed that the behavior of the autoscaling program does not depend on geomagnetic conditions. The comparison between the values of the MUF provided by the presented software and those obtained by an experienced operator indicate that the procedure developed for detecting the nose of oblique ionogram traces is suff
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De, la Jara Sánchez César. "Ionospheric echoes detection in digital ionograms using convolutional neural networks." Master's thesis, Pontificia Universidad Católica del Perú, 2019. http://hdl.handle.net/20.500.12404/14984.

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An ionogram is a graph that shows the distance that a vertically transmitted wave, of a given frequency, travels before returning to the earth. The ionogram is shaped by making a trace of this distance, which is called virtual height, against the frequency of the transmitted wave. Along with the echoes of the ionosphere, ionograms usually contain a large amount of noise of different nature, that must be removed in order to extract useful information. In the present work, we propose to use a convolutional neural network model to improve the quality of the information obtained from digi
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SOUTO, Rodolfo José Cavalcanti. "Estudo do perfil bioquímico, hormonal e anatomopatológico do parênquima hepático e renal em cabras e ovelhas com diagnóstico de toxemia da prenhez." Universidade Federal Rural de Pernambuco, 2013. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/6295.

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Submitted by (lucia.rodrigues@ufrpe.br) on 2017-02-10T13:39:50Z No. of bitstreams: 1 Rodolfo Jose Cavalcanti Souto.pdf: 1672049 bytes, checksum: 9d25ef84b343968c6b40907e7241f724 (MD5)<br>Made available in DSpace on 2017-02-10T13:39:50Z (GMT). No. of bitstreams: 1 Rodolfo Jose Cavalcanti Souto.pdf: 1672049 bytes, checksum: 9d25ef84b343968c6b40907e7241f724 (MD5) Previous issue date: 2013-02-25<br>Pregnancy disease (PD) occurs mainly in sheep and goats, supplemented with concentrate, whose expression is due to negative energy balance during the transition period in which the females prese
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LEGREE, ERIC. "Evaluation du ionogramme sanguin : recherche de situations cliniques predictives d'anomalies ioniques en urgence ; a propos de 140 examens." Rennes 1, 1994. http://www.theses.fr/1994REN1M028.

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LE, CAM YANNICK. "Peut-on envisager une prescription rationnelle du ionogramme sanguin dans un service d'accueil et d'urgences medicales ? etude prospective sur 512 patients." Rennes 1, 1993. http://www.theses.fr/1993REN1M053.

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Lloyd, William Charles. "Ionospheric Sounding During a Total Solar Eclipse." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/89951.

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The ionosphere is a constantly changing medium. From the sun to cosmic rays, the ionosphere proves to be a continually interesting area of study. The most notable change that occurs in the ionosphere is the day and night cycle. The ionosphere is not a singular medium, but rather made up of different sections. The day side of the ionosphere consists of a D, E, F1, and F2 layer. The night day of the ionosphere consists of an E and F layer. These layers all have different properties and characteristics associated with them. A notable interaction is how radio waves propagate through the ionosphere
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Lima, Newton Silva de. "Estudo da propagação de ondas de gravidade na ionosfera equatorial, utilizando observações em Manaus (2,9°s, 60°w)." Universidade Federal do Amazonas, 2009. http://tede.ufam.edu.br/handle/tede/3275.

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Made available in DSpace on 2015-04-22T21:58:41Z (GMT). No. of bitstreams: 1 DISSERTACAO NEWTON SILVA DE LIMA.pdf: 3998686 bytes, checksum: 02eee0382b300c88f69d3be40e62ec7a (MD5) Previous issue date: 2019-05-11<br>CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This work studies the behavior of gravity waves (GW) in the ionosphere over the city of Manaus (2,9oS, 60oW). For that purpose, ionograms which are specters of frequency in function of the altitude and the secular variation of the height for a set of fixed frequencies (3, 4, 5, 6, 7 8 MHz). The observations we
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Sivakumarasamy, Ragavendran. "0D nanotransistor biosensors." Thesis, Lille 1, 2015. http://www.theses.fr/2015LIL10034/document.

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L’objectif de cette thèse était d’explorer le potentiel des biocapteurs à base de transistors à 1 électron. Depuis l’invention de l’électrode de verre il y a plus de 100 ans, la réponse monotone du potentiel de surface avec le pH est devenue universelle. Aussi, il est bien connu que les mesures de la concentration en ions dans des solutions complexes, de grande importance pour le domaine biomédical, requière des membranes sélectives aux ions. En utilisant ces transistors nanométriques, nous montrons une rupture dans ces concepts avec l’observation d’une réponse en U au pH et la mesure sélectiv
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Vairo, Donato. "Participation à l'étude du rôle du système adénosinergique en pathologie cardiovasculaire." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0743/document.

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L'adénosine est un nucléotide purinergique ubiquitaire qui exerce plusieurs fonctions dans l'organisme, notamment au sein du tissu cardiovasculaire, via ses 4 récepteurs RCPGs: A1, A2a, A2B, A3. Le système adénosinergique est donc particulièrement impliqué dans la pathologie cardiovasculaire et en particulier dans la maladie coronarienne et dans la fibrillation auriculaire.Dans la maladie coronarienne, le rôle du récepteur A2a est crucial puisqu'il participe au contrôle du flux coronaire. Nous avons comparé le niveau d’expression de ce récepteur dans les cellules mononuclées circulantes et dan
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Mwene, Anthony Musumba. "Mid-latitude F-region studies based on ISS-B and DE-2 observations /." 2008. http://proquest.umi.com/pqdweb?did=1500083221&sid=5&Fmt=2&clientId=10361&RQT=309&VName=PQD.

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Books on the topic "Ionograms"

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Klein, Milton M. A parameterized procedure for determining real height from ionograms by use of generalized parabolic profiles. Ionospheric Physics Division, Air Force Geophysics Laboratory, 1985.

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Center, National Geophysical Data, ed. Ionogram analysis with the generalised program POLAN. U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Environmental Satellite, Data, and Information Service, National Geophysical Data Center, 1985.

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Book chapters on the topic "Ionograms"

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"Infrastructures and Ionograms." In The Unreliable Nation, edited by Edward Jones-Imhotep. The MIT Press, 2017. http://dx.doi.org/10.7551/mitpress/9780262036511.003.0006.

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This chapter explores how the Alouette satellite’s reorientation of global data flows and mass-production of ionograms altered the natural order at the core of DRTE’s research. The satellite’s unexpected reliability demanded an automated system of data analysis. Automation, when applied to the ionogram, effaced the complexity used to characterize the ionosphere above Canada and explain violent communications disruptions. The chapter first analyzes the debates over the organization of the satellite’s global ground station network, the control of the satellite, the collaboration with NASA, and the sharing of data. It then examines how these considerations formed part of the technical design of the satellite, and specifically how they required a system for mass-producing ionograms from global data gathered around the world. The chapter’s final section focuses on the resulting problems of data analysis that this system produced and the new reading techniques devised to analyze the overwhelming number of records.
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"Interpretation of Ionograms." In The Ionosphere. Elsevier, 2013. http://dx.doi.org/10.1016/b978-1-4832-1312-5.50012-2.

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"Reduction of Ionograms." In The Ionosphere. Elsevier, 2013. http://dx.doi.org/10.1016/b978-1-4832-1312-5.50013-4.

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"Infrastructures and Ionograms." In The Unreliable Nation. The MIT Press, 2017. http://dx.doi.org/10.7551/mitpress/10830.003.0007.

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"Reading Technologies." In The Unreliable Nation, edited by Edward Jones-Imhotep. The MIT Press, 2017. http://dx.doi.org/10.7551/mitpress/9780262036511.003.0004.

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This chapter examines the efforts to make the high-latitude ionogram legible, tracing the effects of that new legibility into wider, resonant views of the relationship between the North and communication failures. It first focuses on the transformations in the way the high-latitude ionogram was read. The same geophysical phenomena that disrupted Northern radio communications made high-latitude ionograms unreadable using standard techniques. Led by one of its founding members, Jack Meek, the Radio Physics Laboratory developed a set of reading regimes that would make these records readable for the first time. The second part of the chapter investigates how the connections built up through these techniques resonated far beyond the laboratory. By linking Northern geophysics and communications disruptions, the Laboratory furnished visual arguments for how defining elements of Canada’s northern-ness threatened reliable communications, feeding back into broader cultural narratives put forward by the Canadian Broadcasting Corporation and the geographer Louis-Edmond Hamelin.
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"Ionogramm." In Springer Reference Medizin. Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-48986-4_312072.

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"Hostile Environments and Cold War Machines." In The Unreliable Nation, edited by Edward Jones-Imhotep. The MIT Press, 2017. http://dx.doi.org/10.7551/mitpress/9780262036511.003.0005.

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This chapter explores the place of satellite technology in the ionosphere’s transformation from natural order to hostile environment. It begins by examining geographic conceptions of hostile environments, their origins in World War II, their development in the early Cold War, and their extension in the late 1950s to include the deep oceans and outer space. It positions the DRTE satellite project (S-27) as part of a broader practice of using the threatened failure of machines to define environmental hostility. In addressing the problem of electronic failure in satellites, DRTE’s engineers drew on a military philosophy of hyper-reliability, generated by widespread concerns about the technological effects of punishing environments, and directed that philosophy towards the problem of reliably generating "topside" ionograms from space. S-27 formed a hinge between DRTE’s decade-long attempts to catalog a distinctive natural order and its eventual use of satellites to bypass it and secure Northern communications.
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Caquet, René. "Ionogramme plasmatique." In Guide infirmier des examens de laboratoire. Elsevier, 2008. http://dx.doi.org/10.1016/b978-2-294-70220-4.50089-8.

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Caquet, René. "Ionogramme urinaire." In Guide infirmier des examens de laboratoire. Elsevier, 2008. http://dx.doi.org/10.1016/b978-2-294-70220-4.50090-4.

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Caquet, René. "Ionogramme plasmatique." In 250 examens de laboratoire. Elsevier, 2010. http://dx.doi.org/10.1016/b978-2-294-71033-9.50121-7.

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Conference papers on the topic "Ionograms"

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Ippolito, A., D. Altadill, C. Scotto, and E. Blanch. "OIASA Oblique Ionograms Automatic Scaling Algorithm Application to the Ionograms Recorded by EBRO Observatory Ionosonde." In 2018 2nd URSI Atlantic Radio Science Meeting (AT-RASC). IEEE, 2018. http://dx.doi.org/10.23919/ursi-at-rasc.2018.8471276.

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Akchurin, Adel, and Gregory Smirnov. "MSTID extraction from more frequent ionograms." In 2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS). IEEE, 2017. http://dx.doi.org/10.23919/ursigass.2017.8105046.

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Mochalov, Vladimir, and Anastasia Mochalova. "Application of Deep Learning to Recognize Ionograms." In 2019 Russian Open Conference on Radio Wave Propagation (RWP). IEEE, 2019. http://dx.doi.org/10.1109/rwp.2019.8810326.

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Benito, E., A. Bourdillon, V. Rannou, and S. Saillant. "Performing inversion of HF radar backscatter ionograms." In IET International Conference on Radar Systems 2007. IEE, 2007. http://dx.doi.org/10.1049/cp:20070556.

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Bartlett, A. "Extraction, analysis and interpretation of digital ionograms." In Sixth International Conference on `HF Radio Systems and Techniques'. IEE, 1994. http://dx.doi.org/10.1049/cp:19940507.

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Thanakulketsarat, Thananphat, Thanomsak Sopon, Watid Phakphisut, Kornyanat Hozumi, and Wannaree Wongtrairat. "Ionograms Scaling by Using the Convolutional Neural Network." In 2021 9th International Electrical Engineering Congress (iEECON). IEEE, 2021. http://dx.doi.org/10.1109/ieecon51072.2021.9440358.

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Akchurin, A. D., V. V. Bochkarev, V. R. Ildiryakov, and K. M. Usupov. "TID selection and research of its characteristics on ionograms." In 2011 XXXth URSI General Assembly and Scientific Symposium. IEEE, 2011. http://dx.doi.org/10.1109/ursigass.2011.6050965.

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Ponomarchuk, Sergey, and Maksim Penzin. "The inversion of backscatter ionograms by continuous chirp signal." In XXV International Symposium, Atmospheric and Ocean Optics, Atmospheric Physics, edited by Gennadii G. Matvienko and Oleg A. Romanovskii. SPIE, 2019. http://dx.doi.org/10.1117/12.2539860.

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Ippolito, Alessandro, Carlo Scotto, Matthew Francis, Dario Sabbagh, and Vittorio Sgrigna. "A procedure for the automatic scaling of oblique ionograms." In 2015 1st URSI Atlantic Radio Science Conference (URSI AT-RASC). IEEE, 2015. http://dx.doi.org/10.1109/ursi-at-rasc.2015.7303122.

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Ponomarchuk, S. N., V. P. Grozov, G. V. Kotovich, V. I. Kurkin, and M. S. Penzin. "Automatic processing and interpretation of backscatter ionosphere sounding ionograms." In XXII International Symposium Atmospheric and Ocean Optics. Atmospheric Physics, edited by Gennadii G. Matvienko and Oleg A. Romanovskii. SPIE, 2016. http://dx.doi.org/10.1117/12.2248765.

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Reports on the topic "Ionograms"

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Dandekar, B. S. Study of Equatorial Clutter Using Observed and Simulated Long Range Backscatter Ionograms. Defense Technical Information Center, 1995. http://dx.doi.org/10.21236/ada309841.

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Kuklinski, Walter S., Kavitha Chandra, and Bodo W. Reinisch. Preliminary Development of Oblique Ionogram Automatic Scaling Algorithm. Defense Technical Information Center, 1988. http://dx.doi.org/10.21236/ada222652.

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