scholarly journals Geoinformation system for analyzing the dynamics of extreme geomagnetic disturbances from observations of ground stations

2020 ◽  
Vol 44 (5) ◽  
pp. 782-790
Author(s):  
A.V. Vorobev ◽  
V.A. Pilipenko ◽  
T.A. Enikeev ◽  
G.R. Vorobeva

The paper is concerned with an approach to developing a specialized web-GIS based on a microservice architecture that provides analytical control of the disturbed component of geomagnetic field variations, according to observation data from magnetic observatories and variational stations published on the SuperMAG portal (http://supermag.jhuapl.edu/). A method of spatial interpolation of geomagnetic data implemented in the proposed web-GIS, together with the proposed scheme for ranking and interpreting them, as well as a visualization method in the form of isolines, allows a user to track the structure, observe the dynamics, identify probable regions, duration and time intervals of the occurrence of extreme geomagnetic disturbances.

2019 ◽  
Vol 43 (6) ◽  
pp. 1053-1063 ◽  
Author(s):  
G.R. Vorobeva

Monitoring of geomagnetic field parameters and its variations is mainly carried out using ground-based magnetic observatories and variational stations. However, the imperfection of equipment used and the communication channels involved causes the presence of gaps in the time series of geomagnetic data, which, along with the spatial anisotropy of data sources, creates significant obstacles to their automated processing. In addition, the well-known methods for imputation of time series gaps provide the root-mean-square recovery error significantly exceeding the level acceptable for geophysical observations. Thus, the paper proposes a method for recovering geomagnetic data based on statistical methods for processing time series and machine learning principles using marked data and characterized by the fact that a pair of the time series fragments preceding and succeeding a missing fragment provide an indicative description of the time series fragment of interest, which together form a training sample to search for the missing fragment by a set of its attributes, followed by linear scaling to restore the original trend of an information signal. Analytical estimates of parameters of geomagnetic data time series are given, under which it is possible to apply the proposed method to recover both daily variations and several-minutes-long fragments.


2021 ◽  
Author(s):  
George Alexandrakis ◽  
Federico Nomi ◽  
Claudia Speciale ◽  
Sandro De Vita ◽  
Mauro Antonio Di Vito

<p>Geological and environmental conditions that influence local topography also affect indirectly the location of human settlement dynamics. Understanding those relationships plays an important role in archaeological research related to the evolution of settlement dynamics. In the lower Tyrrhenian Islands, an important parameter is also the volcanic landscape evolution. This work aims to study the patterns of Neolithic, Cooper and Bronze Age settlements, based on known archaeological sites at the Low Tyrrhenian Islands, and to generate hypotheses about the relations of settlement patterns with the volcanic landscape. To that end, a Web-GIS database was created, which was fed with topographic, geological, geomorphological data and Earth Observation data. Geomorphological analysis, derived from digital elevation models, and earth observation products such as the SENTINEL missions, can provide useful estimations into the processes shaping landscapes and insight into the location and evolution of settlements. The analysis includes a series of different data correlation, from geomorphologic to socioeconomic, integrated by an indicator analysis. A series of thematic maps were developed to interpret why areas were selected to host settlements. Through the use of the database that was developed during the project, a set of indexes have been applied. Those included exposure and vulnerability indices for the inland and coastal areas, but also location and defensibility indices for the archaeological sites. Moreover, baseline maps for future risk estimations through a Multi-Criteria Decision Analysis System (MCDA), have been produced. The Volcanic Islands of the lower Tyrrhenian coast have a volcanic origin and were influenced, and partly still are, by explosive and effusive eruptions of various energy and types, by more or less intense deformational events, often connected with the dynamics of the volcano, and quiescent periods of varying duration. The areas under investigation present different characteristics in their geomorphological but also their societal evolution. Geomorphological data further analyzed in a ternary diagram that indicated the relative influence of each of the parameters in each area. From the diagram, it can be seen that the locations of human activities are strongly affected by past and recent volcanic activity.</p><p>Acknowledgement: This work is part of the Brains2Islands “INDAGINE MULTIDISCIPLINARE NEI CONTESTI INSULARI BASSO TIRRENICI” project Funded by FONDAZIONE CON IL SUD project number 2015-0296</p>


2020 ◽  
Vol 15 (3) ◽  
pp. 21-35
Author(s):  
Rick Stoddart ◽  
Bruce Godfrey

Abstract Objective –This article reports on a pilot research project that gathered usage statistics in specifically designated library learning spaces using a Web-based Geographic Information System (GIS). These learning spaces were then mapped to expected learning activities that would occur in these areas based on its intention or design. In this way, the library could begin to associate the usage of a space with different types of learning. The researchers then mapped these learning activities to campus learning outcomes to create learning impact statements. Methods – The researchers used observation data gathered with a Web GIS tool to examine space usage within the library’s curriculum center. Results – The pilot study found that student usage of the curriculum center was mainly associated with two campus learning outcomes: (1) Communicate and (2) Learning and Integrate. The evidence also indicated possible design improvements that may make the curriculum centers spaces more functional for students. Conclusions – The Web GIS tool proved to be a useful tool to gather evidence of student space usage within the library environment. The mapping of individual spaces to learning activities further enhanced the usefulness in interpreting how students are using library spaces. Leveraging the space usage data within learning outcomes statements created another means for the library to communicate its learning impact with campus stakeholders.


2021 ◽  
Author(s):  
A.A. Dontsov ◽  
I.A. Sutorikhin

The paper discusses the use of microservice architecture in the development of geographic information systems (GIS) for collecting, processing and analyzing data. As a rule, microservice architecture is used to build applications in information systems related to solving business problems, and is not widespread in the development of geographic information systems in the scientific field. However, its application is now becoming increasingly important. Decomposition of the software implementation and GIS infrastructure associated with computations and data processing into components in the form of microservices has a number of advantages, such as: increased fault tolerance, increased flexibility, reduced maintenance effort, simplified scaling, and others. The first results of the application of the microservice approach in the development of a geoinformation system for the collection and processing of hydrological and hydrobiological data on the state of water bodies are shown. The architecture, main components, and features of the information infrastructure are shown.


Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2359 ◽  
Author(s):  
Agnieszka Gil ◽  
Renata Modzelewska ◽  
Szczepan Moskwa ◽  
Agnieszka Siluszyk ◽  
Marek Siluszyk ◽  
...  

We analyze the solar influence of space weather events on Polish energy infrastructure via geomagnetic disturbances. We consider two time intervals of very different levels of solar activity (SA) in the course of the solar activity cycle 24: 2010—an early rising phase of SA, near the solar minimum and 2014—solar maximum. From the total number of electrical grid failures, we extract almost five thousand failures in 2010 and more than ten thousand in 2014, which could be related to space weather effects. We analyze data of failures having unidentified causes, failures coupled with the aging of transmission network elements and electronic devices, which appeared during the time intervals of enhanced geomagnetic activity. We show that around the times of increasing geomagnetic activity level, the amount of transmission lines failures in the groups mentioned above grows, but mostly with some delay. It might be connected to some cumulative effect due to the result of transient states and their propagation in the distribution network. Although we do not exclude that the other factors may play a role, the solar-originating disturbances strengthen these effects.


2021 ◽  
Author(s):  
Aude Chambodut

<p>The K index was devised by Bartels et al. (1939) to provide an objective monitoring of irregular geomagnetic activity at subauroral latitudes. K indices are based upon geomagnetic disturbances, measured in horizontal geomagnetic components at magnetic observatories, after « eliminating » the regular daily variation. An individual K index is an integer in the range 0 to 9 corresponding to a class that contains the largest range of geomagnetic disturbances (in either of the two horizontal components) during a 3-hour UT interval. Limits of range vary from one observatory to another since they depend on the corrected geomagnetic latitude of the observatory.</p><p>A great number of Space Weather applications rely on K-derived magnetic activity indices at subauroral latitudes. These historical indices; endorsed by IAGA such as Kp, aa and am; represent unprecedented homogeneous time series, up to more than 150 years, highly valuable for all studies related to long-term geomagnetic activity.</p><p>However, one has to keep in mind that local K indices and subauroral related ones (K-derived) were developed during other time, under specific societal and technological conditions.</p><p>We recall the local K indices derivation processes and characteristics to enlight possible nowadays drawbacks and their simple mitigations.</p>


2009 ◽  
Vol 27 (2) ◽  
pp. 831-837 ◽  
Author(s):  
O. Zeller ◽  
J. Bremer

Abstract. The dependence of mesospheric VHF radar echoes during summer months on geomagnetic activity has been investigated with observation data of the OSWIN radar in Kühlungsborn (54° N) and of the ALWIN radar in Andenes (69° N). Using daily mean values of VHF radar echoes and of geomagnetic activity indices in superimposed epoch analyses, the comparison of both data sets shows in general stronger radar echoes on the day of the maximum geomagnetic activity, the maximum value one day after the geomagnetic disturbance, and enhanced radar echoes also on the following 2–3 days. This phenomenon is observed at middle and polar latitudes and can be explained by precipitating particle fluxes during the ionospheric post storm effect. At polar latitudes, the radar echoes decrease however during and one day after very strong geomagnetic disturbances. The possible reason of this surprising effect is discussed.


Author(s):  
Laurentiu Asimopolos ◽  
Natalia-Silvia Asimopolos ◽  
Adrian Aristide Asimopolos

2020 ◽  
Author(s):  
Giuseppe Calamita ◽  
Maria Rosaria Gallipoli ◽  
Angela Perrone ◽  
Vincenzo Serlenga ◽  
Tony Alfredo Stabile ◽  
...  

<p><span><span>The global urbanization process, along with the environmental impacts it carries with it, requires the adoption of innovative programming strategies for the sustainable and efficient management of natural resources and to improve the resilience of cities to natural disasters. In this scenario where the acquisition of a deeper and as thorough as possible knowledge of the territory on the problems connected with the phenomena of hydrogeological instability and natural risk in general that can affect the inhabited centers pose new challenges both at the level of government and for the scientific community. Further, it is also important to organize and make these complex information easily accessible to stakeholders, i.e. administrators, planners and civil protection. </span></span></p><p><span><span>In the framework of two national projects, CLARA (</span><span>CLoud plAtform and smart underground imaging for natural Risk Assessment</span><span>) and SPOT (Development of</span><span> a Platform for the provision of innovative services based on Earth Observation data), a systemic approach based on the integration of the latest enabling technologies (remote sensing and ground-based, active and passive, direct and indirect, multi-sources and multi-resolution) for the geo-physical characterization (seismic and electromagnetic) of the surface and near-surface and for the dynamic characterization of soil structure/infrastructure interactions was applied in the urban area of the city of Matera (southern Italy). By adopting the open-government and open-data paradigms, all the information collected have been eventually organized and shared in a web-gis along with geospatial data already available on different and independent web-services of local government authorities (region and municipality).</span></span></p>


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