132 research outputs found
From COST 238 To COST 296: Four European COST Actions On Ionospheric Physics And Radio Propagation
COST (Co-operation in the field of Scientific and Technical Research) is an important instrument supporting co-operation among scientists and researchers across Europe now joining 35 member countries. Scientific
projects in the COST framework are called COST Actions and have the objectives embodied in their respective Memorandum of Understanding (MoU). The main objectives of the COST Actions within the European ionospheric and radio propagation community have been: to study the influence of upper atmospheric conditions on terrestrial and Earthspace communications, to develop methods and techniques to improve existing and generate new ionospheric and propagation models over Europe for telecommunication and navigation applications and to transfer the results to the appropriate national and international organizations, institutions and industry dealing with the modern communication systems. This paper summarises in brief the background and historical context of four ionospheric COST Actions and
outlines their main objectives and results. In addition, the paper discusses the dissemination of the results and the
collaboration among the participating institutions and researchers
The COST 271 Action: conclusions and the way ahead
A brief summary is given of the major achievements of the COST 271 Action. New challenges have been identified that open the way for a proposal, which is outlined, for a follow-on to the COST 271 Action within the COST Telecommunications, Information Science and Technology
framework
COST 271 Action - Effects of the upper atmosphere on terrestrial and Earth-space communications: introduction
The COST 271 Action («Effects of the Upper Atmosphere on Terrestrial and Earth-space Communications
») within the European ionospheric community has the objectives, embodied in the
Memorandum of Understanding (MoU): to study the influence of upper atmospheric conditions on
terrestrial and Earth-space communications, to develop methods and techniques to improve ionospheric
models over Europe for telecommunication and navigation applications and to transfer the results
to the appropriate Radiocommunication Study Groups of the International Telecommunication
Union (ITU-R) and other national and international organizations dealing with the modern communication
systems. This introductory paper summarises briefly the background and historical context
of COST 271 and outlines the main objectives, working methods and structure. It also lists the participating
countries and institutions, the Management Committee (MC) Meetings, Workshops and
Short-term Scientific Missions. In addition, the paper discusses the dissemination of the results and
the collaboration among the participating institutions and researchers, before outlining the content of
the Final Report
The European COST (Co-operation in the field of Scientific and Technical Research) Actions: an important chance to cooperate and to grow for all the international ionospheric community
The current COST (Co-operation in the field of Scientific and Technical Research) Action 296 on Mitigation of Ionospheric Effects on Radio Systems, along with previous COST238 (Prediction and Retrospective Ionospheric Modelling over Europe), COST251 (Improved Quality of Service in Ionospheric Telecommunication Systems Planning and Operation) and COST271 (Effects of the Upper Atmosphere on Terrestrial and Earth-Space Communications) Actions have addressed
investigations of the different effects of the ionosphere on terrestrial telecommunication systems and on Earth-space systems. Throughout their lifetime of 20 years, these COST actions have achieved a
great deal in long-term archiving of synoptic soundings of the state of the ionosphere, in enhancing understanding of the morphology of the ionosphere and its dependence on space weather and in producing ionosphere-plasmasphere as well as propagation models for terrestrial radio services available to variety of radio users. Besides the formal contributions to ITU-R and the contributions to international organisations such as URSI, COSPAR, EGU and ESA, these COST Actions have provided a forum for the establishment of collaborative European initiatives, a centre of expertise
and excellence in ionosphere knowledge when none other equivalent in Europe or elsewhere exists. In this paper, we review the main achievements of the COST 238, 251 and 271 actions as developed in the past studies
COST 296 MIERS: Mitigation of Ionospheric Effects on Radio Systems
The COST 296 Action MIERS (Mitigation of Ionospheric Effects on Radio Systems) within the ionospheric community has the objectives, embodied in the Memorandum of Understanding (MoU), to develop an increased
knowledge of the effects imposed by the ionosphere on practical radio systems, and the development and implementation
of techniques to mitigate the deleterious effects of the ionosphere on such systems. This introductory paper summarizes briefly the background and historical context of COST 296 and outlines the main objectives,
working methods and structure. It also lists the participating countries and institutions, the Management Committee (MC) Meetings, the Workshops, Short-term Scientific Missions. In addition, the paper discusses the dissemination activities and the collaboration among the participating institutions and researchers, before outlining the content of the Final Report
COST 296 MIERS: conclusion
The need for more reliable and efficient
communications services, especially those involving ionospheric HF communications and
navigational systems, imposes increasing demand for a better knowledge of the effects imposed by the Earth’s upper atmosphere and
ways to mitigate disturbing effects. Temporal
and spatial changes in the upper atmosphere act to limit and degrade the performance of terrestrial and Earth-space radio systems in many different ways and this is why mitigation activities must involve several topics like ionospheric monitoring and modeling, development of new hardware for communication systems and new propagation simulator, measurements and modeling
of ionospheric Total Electron Content
(TEC) and ionospheric scintillations, using in particular the Global Positioning System
(GPS). The European ionospheric community
has long been aware that cooperation research
on an international basis is essential to deal with such complex issues. In particular, international cooperation is required for the collection of data, in both the real-time and in retrospective
modes, the development and verification of
new methods to improve the performance of
both operational and future terrestrial and
Earth-space communication systems and the
exchange of expertise on space plasma effects
on Global Navigation Satellite Systems
(GNSS).
In this context the COST 296 Action
MIERS on the «Mitigation of Ionospheric Effects on Radio Systems» has made a significant impact in a number of areas
Intra-abdominal pressure values of emergency department intensive care unit patients and clinical outcomes
Testing the three-dimensional IRI-SIRMUP-P mapping of the ionosphere for disturbed periods
This paper describes the three-dimensional (3-D) electron density mapping of the ionosphere given as output by the assimilative IRI-SIRMUP-P (ISP) model for three different geomagnetic storms. Results of the 3-D model are shown by comparing the electron density profiles given by the model with the ones measured at two testing ionospheric stations: Roquetes (40.8 °N,0.5 °E), Spain, and San Vito (40.6°N,17.8 °E), Italy. The reference ionospheric stations from which the autoscaled foF2 and M(3000)F2 data as well as the real-time vertical electron density profiles are assimilated by the ISP model are those of El Arenosillo (37.1 °N,353.3° E), Spain, Rome (41.8 °N,12.5 °E), and Gibilmanna (37.9° N,14.0 °E), Italy. Overall, the representation of the ionosphere made by the ISP model is better
than the climatological representation made by only the IRI-URSI and the IRI-CCIR models. However, there are few cases for which the assimilation of the autoscaled data from the reference stations causes either a strong underestimation or a strong overestimation of the real conditions of the ionosphere, which is in these cases better represented by only the IRI-URSI model. This ISP misrepresentation is mainly due to the fact that the reference ionospheric stations covering the region mapped by the model turn out to be few, especially for disturbed periods when the ionosphere is very variable both in time and in space and hence a larger number of stations would be required. The inclusion of new additional reference ionospheric stations could surely smooth out this concern
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