Difference between pages "JSG T.24" and "JSG T.33"

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(Created page with "<big>'''JSG 0.11: Multiresolutional aspects of potential field theory'''</big> Chair:''Dimitrios Tsoulis (Greece)''<br> Affiliation:''Comm. 2, 3 and GGOS'' __TOC__ ===Intro...")
 
 
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<big>'''JSG 0.11: Multiresolutional aspects of potential field theory'''</big>
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<big>'''JSG 0.20: Space weather and ionosphere'''</big>
  
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Chair:''Dimitrios Tsoulis (Greece)''<br>
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Chair: '': Klaus Börger (Germany)''<br>
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Affiliation:''Comm. 2, 3 and GGOS''
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Affiliation:''Commissions 1, 4 and GGOS''
  
 
__TOC__
 
__TOC__
  
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===Introduction===
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===Terms of Reference===
  
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The mathematical description and numerical computation of the gravity signal of finite distributions play a central role in gravity field modelling and interpretation. Thereby, the study of the field induced by ideal geometrical bodies, such as the cylinder, the rectangular prism or the generally shaped polyhedron, is of special importance both as fundamental case studies but also in the frame of terrain correction computations over finite geographical regions.
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It is well known that space geodetic methods are under influence of ionospheric refraction, and therefore from the very beginning of these techniques geodesy deals with the ionosphere. In this context sophisticated methods and models have been developed in order to determine, to represent and to predict the ionosphere. Apart from this the ionosphere fits into another issue called „space weather“, which describes the interactions between the constituents of space and earth. To be more precise space weather means the conditions in space with a significant impact on space-based and ground-based technology as well as on earth and its inhabitants.  Solar radiation, that is electromagnetic emission as well as particle emission, is the main cause or “drive” of space weather.
  
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Analytical and numerical tools have been developed for the potential function and its derivatives up to second order for the most familiar ideal bodies, which are widely used in gravity related studies. Also, an abundance of implementations have been proposed for computing these quantities over grids of computational points, elaborating data from digital terrain or crustal databases.
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Originally, geodesy, or to be more precise, space geodetic methods have considered the ionosphere as a disturbing factor that affects signal propagation and that has to be corrected. This (geodetic) perspective has been changed over time and the ionosphere has become a target value so that geodetic observations are used to determine the ionosphere. Different groups have developed models of high quality, e.g. 3D-models which describe the ionosphere as a function of longitude, latitude and time or even 4D-models accounting for the height as well. However, since the ionosphere is a manifestation of space weather, geodesy should contribute to space weather research, and in this respect completely new scientific questions arise, in particular with respect to the so called “geo-effect”, which is the impact of space weather in general.
  
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Scope of the Study Group is to investigate the possibilities of applying wavelet and multiscale analysis methods to compute the gravitational effect of known density distributions. Starting from the cases of ideal bodies and moving towards applications involving DTM data, or hidden structures in the Earth's interior, it will be attempted to derive explicit approaches for the individual existing analytical, numerical or combined (hybrid) methodologies. In this process, the mathematical consequences of expressing in the wavelet representation standard tools of potential theory, such as the Gauss or Green theorem, involved for example in the analytical derivations of the polyhedral gravity signal, will be addressed. Finally, a linkage to the coefficients obtained from the numerical approaches but also to the potential coefficients of currently available Earth gravity models will also be envisaged.
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There are two principal goals of the proposed study group. First, to connect the “geodetic” ionosphere research with solar-terrestrial physics, in order to consider the complete cause-effect-chain. Second, the above mentioned “geo-effect” has to be investigated in detail, which is an important aspect, because modern society depends to a great extent on technology, i.e. technology that can be disturbed, that can be harmed or that even can be destroyed by extreme space weather events
  
 
===Objectives===
 
===Objectives===
  
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* Bibliographical survey and identification of multiresolutional techniques for expressing the gravity field signal of finite distributions.
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* improvements and enlargements of ionosphere models (including scintillations)
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* Case studies for different geometrical finite shapes.
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* geodetic contributions to investigate the impact of space weather/the ionosphere (extreme events) on satellite motion
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* Comparison and assessment against existing analytical, numerical and hybrid solutions.
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* geodetic contributions to investigate the impact of space weather/the ionosphere (extreme events) on communication
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* Computations over finite regions in the frame of classical terrain correction computations.
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* investigations of the impact of space weather/the ionosphere (extreme events) on remote sensing products
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* Band limited validation against available Earth gravity models.
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* investigations of the impact of space weather/the ionosphere (extreme events) on terrestrial technical infrastructure (metallic networks, power grids)
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* “geodetic observations” of currents (ring current, electrojets)
  
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===Program of Activities===
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===Program of activities===
  
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* Active participation at major geodetic meetings.
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* the maintaining of a website for general information as well as for internal exchange of data sets and results
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* Organize a session at the forthcoming Hotine-Marussi Symposium.
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* organization of a workshop w.r.t. space weather and geo-effects
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* Compile a bibliography with key publications both on theory and applied case studies.
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* publication of important findings
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* Collaborate with other working groups and affiliated IAG Commissions.
 
  
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===Members===
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===Membership===
  
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'' '''Dimitrios Tsoulis (Greece), chair''' <br />Katrin Bentel (USA) <br /> Maria Grazia D'Urso (Italy) <br /> Christian Gerlach (Germany) <br /> Wolfgang Keller (Germany) <br /> Christopher Kotsakis (Greece) <br /> Michael Kuhn (Australia) <br /> Volker Michael (Germany) <br /> Pavel Novák (Czech Republic) <br /> Konstantinos Patlakis (Greece) <br /> Clément Roussel (France) <br /> Michael Sideris (Canada) <br /> Jérôme Verdun (France) <br />''
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'' '''Klaus Börger (Germany), chair''' <br /> Mahmut Onur Karsioglu (Turkey), vice-chair <br /> Michael Schmidt (Germany) <br /> Jürgen Matzka (Germany) <br /> Barbara Görres (Germany) <br /> George Zhizhao Liu (Hong Kong, China) <br /> Ehsan Forootan (Germany) <br /> Johannes Hinrichs (Germany) <br />''
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====Corresponding members====
 
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''Christopher Jekeli (USA) <br /> Frederik Simons (USA) <br /> Nico Sneeuw (Germany)''
 

Revision as of 10:15, 29 April 2016

JSG 0.20: Space weather and ionosphere

Chair: : Klaus Börger (Germany)
Affiliation:Commissions 1, 4 and GGOS

Terms of Reference

It is well known that space geodetic methods are under influence of ionospheric refraction, and therefore from the very beginning of these techniques geodesy deals with the ionosphere. In this context sophisticated methods and models have been developed in order to determine, to represent and to predict the ionosphere. Apart from this the ionosphere fits into another issue called „space weather“, which describes the interactions between the constituents of space and earth. To be more precise space weather means the conditions in space with a significant impact on space-based and ground-based technology as well as on earth and its inhabitants. Solar radiation, that is electromagnetic emission as well as particle emission, is the main cause or “drive” of space weather.

Originally, geodesy, or to be more precise, space geodetic methods have considered the ionosphere as a disturbing factor that affects signal propagation and that has to be corrected. This (geodetic) perspective has been changed over time and the ionosphere has become a target value so that geodetic observations are used to determine the ionosphere. Different groups have developed models of high quality, e.g. 3D-models which describe the ionosphere as a function of longitude, latitude and time or even 4D-models accounting for the height as well. However, since the ionosphere is a manifestation of space weather, geodesy should contribute to space weather research, and in this respect completely new scientific questions arise, in particular with respect to the so called “geo-effect”, which is the impact of space weather in general.

There are two principal goals of the proposed study group. First, to connect the “geodetic” ionosphere research with solar-terrestrial physics, in order to consider the complete cause-effect-chain. Second, the above mentioned “geo-effect” has to be investigated in detail, which is an important aspect, because modern society depends to a great extent on technology, i.e. technology that can be disturbed, that can be harmed or that even can be destroyed by extreme space weather events

Objectives

  • improvements and enlargements of ionosphere models (including scintillations)
  • geodetic contributions to investigate the impact of space weather/the ionosphere (extreme events) on satellite motion
  • geodetic contributions to investigate the impact of space weather/the ionosphere (extreme events) on communication
  • investigations of the impact of space weather/the ionosphere (extreme events) on remote sensing products
  • investigations of the impact of space weather/the ionosphere (extreme events) on terrestrial technical infrastructure (metallic networks, power grids)
  • “geodetic observations” of currents (ring current, electrojets)

Program of activities

  • the maintaining of a website for general information as well as for internal exchange of data sets and results
  • organization of a workshop w.r.t. space weather and geo-effects
  • publication of important findings

Membership

Klaus Börger (Germany), chair
Mahmut Onur Karsioglu (Turkey), vice-chair
Michael Schmidt (Germany)
Jürgen Matzka (Germany)
Barbara Görres (Germany)
George Zhizhao Liu (Hong Kong, China)
Ehsan Forootan (Germany)
Johannes Hinrichs (Germany)

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