scholarly journals Analysis of the possibility of using Russian geomagnetic stations to calculate the analogue of the Dst-index

2021 ◽  
pp. 80-87
Author(s):  
В.А. Мочалов ◽  
А.В. Мочалова
Keyword(s):  
Comparative Analysis ◽  
Classical Method ◽  
San Juan ◽  
Dst Index ◽  
Using Data

В работе анализируется возможность построения аналога Dst-индекса по данным с российских геомагнитных обсерваторий. Проводится сравнительный анализ значений Dst-индекса, вычисленного классическим способом (по данным с 4 приэкваториальных станций: Hermanus, Kakioka, Honolulu и San Juan), со значениями Dst-индекса, посчитанного по данным исключительно с Российских станций. The paper analyzes the possibility of constructing an analogue of the Dst index using data from Russian geomagnetic observatories. A comparative analysis of the values of the Dstindex calculated by the classical method (according to data from 4 near-equatorial stations: Hermanus, Kakioka, Honolulu and San Juan) with the values of the Dst-index calculated according to data exclusively from Russian stations is carried out.

scholarly journals Comparative Analysis of Distribution of Intertidal Fish Assemblages in Different Estuarine Systems on Northern Coast of Brazil

2017 ◽  
Vol 10 (2) ◽  
pp. 26 ◽  
Author(s):  
Milton Goncalves Silva Junior ◽  
Antonio Carlos Leal Castro ◽  
Ulrich Saint-Paul
Keyword(s):  
Comparative Analysis ◽  
Fish Assemblages ◽  
Coastal Region ◽  
Fish Fauna ◽  
Estuarine Fish ◽  
Northern Coast ◽  
Tidal Creeks ◽  
Estuarine Systems ◽  
Using Data ◽  
High Dynamics

The northern coast of Brazil has more than 30 estuaries distributed along 650 km of coastline. These conditions favor the presence of relatively large fish communities in estuarine environments, but published information on the fish fauna in tidal creeks in northern Brazil is only available for some mangrove systems, and comparative studies between fish estuarine communities in different tidal creeks are less common. The choice of the study area was based on the fact that it has been poorly investigated with regard to estuarine fish fauna in comparison in mangrove tidal creeks using the same fishing gear. The objective of the present study was to compare the composition of the relative biomass of taxonomic, functional and ecological guilds of fish assemblages occurring in estuarine systems along the northern coast of Brazil. The study area of the present comparative analysis extended from the southeastern edge of the Marajoara Gulf to the western edge of the Maranhense Gulf. A comparative analysis among different estuarine systems was performed using data from other studies. The abundance of juveniles was greater in the Caeté, Curuçá and Cururuca estuaries than other estuaries. Cluster analysis separated the estuaries into two distinct groups and significant differences between these groups only exist in relation to geographical proximity. The present investigation indicates that the coastal region between the states of Pará and Maranhão is characterized by high dynamics and environmental heterogeneity, particularly with regard to changes in river discharge and tidal fluctuations. The present results underscore the importance of ecological information on ichthyofauna in tropical estuaries in order to include appropriate descriptors in conservation or restoration processes of marine communities and habitats.

scholarly journals Comparative analysis for three models of hysteretic water retention capacity using data on silty soil

2020 ◽  
Vol 1614 ◽  
pp. 012080
Author(s):  
V A Lazarev ◽  
R S Ginevsky ◽  
A G Topaj ◽  
A O Nikonorov ◽  
I A Dunaieva ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Water Retention ◽  
Water Retention Capacity ◽  
Retention Capacity ◽  
Silty Soil ◽  
Using Data

scholarly journals Jespersen Cycles on Malekula

2015 ◽  
Vol 19 (3) ◽  
Author(s):  
Julie Barbour
Keyword(s):  
Comparative Analysis ◽  
Indigenous Languages ◽  
Double Negation ◽  
Using Data

AbstractIn the indigenous languages of Malekula Island, members of Oceanic, diverse standard negation strategies have been identified, including double negation, simple preverbal negators, and simple postverbal negators. Individual languages may display more than one strategy. In this article, evidence from Malekula is considered for the typological hypothesis known as the Jespersen Cycle(s). Six standard negation strategies are described in detail and illustrated using data from a sample of Malekula languages. Here, the Jespersen Cycle hypothesis is employed to understand diversity in the synchronic patterning of standard negation in a comparative analysis of the sample: the diverse standard negation strategies found both language-internally and comparatively can be understood as iterations of the Jespersen Cycle(s).

Comparative Analysis of Traditional Polling and Profiling Using Big Data Analysis and Geolocalization Data on the Example of Research Among Sports Fans Participating in the 2017 UEFA European Under-21 Championship

2019 ◽  
Vol 53 ◽  
pp. 9-9
Author(s):  
Jakub Ryśnik ◽  
Danuta Żylak ◽  
Piotr Gibas
Keyword(s):  
Comparative Analysis ◽  
Big Data Analysis ◽  
Tourism Demand ◽  
Sports Fans ◽  
Advantages And Disadvantages ◽  
Ex Post ◽  
European Football ◽  
Using Data ◽  
External Entity

Purpose. The aim of the paper was multifaceted comparison of two research procedures used to study tourism demand, i.e. classic poll survey and the analysis of smartphone user data using Big Data Analysis (BDA). The aim of the paper was also to review of potential analysis forms that can be performed using data from smartphone users that also contains geolocalization data. Method. The essence of the research study is comparative analysis of two different research methodologies used during the examination of the sports fans of the U21 European Football Championship in Tychy in June 2017. Selected organisational aspects of these studies and the advantages and disadvantages of the research procedures were compared. The study on tourism demand was carried out in two ways. In the first approach, the classic poll method was used in order to survey the tourists at the destination place. The authors conducted a survey with the modified MSSC scale (Motivation Scale for Sport Consumption) on 278 spectators (targeted choice). The results were confronted with the analysis of smartphone users' data (including geolocalization data) using BDA, which was carried out ex-post by an external entity on behalf of AWF Katowice. Findings. The analysis of research procedures brought forward a number of conclusions regarding the advantages and disadvantages of the applied research approaches and allows to estimate the potential of using BDA within the context of tourism demand research. The research analysis gives reasons to revise the classical methodological paradigm on the relatively high costs and difficulties associated with comprehensive research in relation to partial research. There are a number of premises resulting from the smartphoneisation of society, which provide arguments constituting a new paradigm stating that, in the conditions of digitisation of tourist activities, comprehensive research is more and more available and conducting this type of assessment is realistically possible. Research and conclusions limitations. The presented comparative analysis is in fact a case study, which limits the conclusions formulated on its basis. Practical implications. The article may help research teams who plan to or conduct research using data from smartphone users based on BDA, including those who analyse tourist demand research at regional and local levels for public entities. Originality. The novelty of this paper is the attempt to compare research procedures. The work also partially presents the unpublished results of BDA among the fans of the U21 European Football Championships in Tychy in June 2017, which was carried out ex-post by an external entity ordered by AWF Katowice. Type of paper. An article presenting the results of empirical research partly as a case study.

Forecasting the Dst index from L5 in-situ data using PREDSTORM: accuracy and applicability

2020 ◽  
Author(s):  
Rachel Bailey ◽  
Christian Moestl ◽  
Martin Reiss ◽  
Andreas Weiss ◽  
Ute Amerstorfer ◽  
...  
Keyword(s):  
Solar Wind ◽  
High Speed ◽  
Dst Index ◽  
Wind Speeds ◽  
In Situ Data ◽  
L1 Data ◽  
Earth Environment ◽  
Speed Solar Wind ◽  
Using Data

<p>STEREO-B and STEREO-A are both important proxies for potential solar wind monitors at the Sun-Earth L5 point. In this study, measurements from STEREO-B are used to determine how well the Dst index in particular can be predicted using data measured near the L5 point. This is useful for determining the geoeffectivity of storms resulting from high-speed solar wind streams. Observed solar wind speeds are first mapped to the near-Earth environment as if they had been measured at L1, and the Dst is predicted from the data using a solar wind-to-Dst model. We find that Dst predicted from L5 data performs better than a recurrence model assuming the solar wind conditions repeat every 27 days, although not as well as when predicted from L1 data. The newly developed approach is currently implemented in the PREDSTORM software package to provide a real-time Dst forecast using STEREO-A data.</p>

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