http://hdl.handle.net/2122/292 Search the Channel search http://www.earth-prints.org/simple-search http://hdl.handle.net/2122/4075 Title: foF2 prediction in Rome observatory <br/> <br/>Authors: Perrone, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Pietrella, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Zolesi, B.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Malagnini, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia <br/> <br/>Editors: U.R.S.I.; International Union of Radio Science <br/> <br/>Abstract: A prediction procedure of the hourly values of the critical frequency of the F2 ionospheric layer, foF2, based on the local geomagnetic index ak, is presented. The geomagnetic index utilised is the time-weighted accumulation magnetic index ak(τ) based on recent past history of the index ak. It is utilised an empirical relationship between the log(NmF2(t)/ NmF2M), where NmF2(t) is the hourly maximum electron density at the F2 peak layer and NmF2M is its 'quiet' value, and the time weighted magnetic index. The prediction of foF2 is calculated during periods of severe magnetic activity in the current solar cycle 23 in Rome observatory. Wed, 06 Aug 2008 22:58:59 GMT http://hdl.handle.net/2122/4035 Title: Positioning errors during space weather - Event of October 2003 <br/> <br/>Authors: Alfonsi, Lu.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; De Franceschi, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Romano, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Aquino, M.; Institute of Engineering Surveying and Space Geodesy (IESSG), The University of Nottingham; Dodson, A.; Institute of Engineering Surveying and Space Geodesy (IESSG), The University of Nottingham <br/> <br/>Abstract: The article describes the measurements made by ISACCO during the superstorm of October 2003 used to assess the positioning errors affecting GNSS users and their correlation with the occurrence of observed levels of scintillation. Sat, 29 Oct 2005 22:58:59 GMT http://hdl.handle.net/2122/3982 Title: Space weather and RF communications: Monitoring and modelling <br/> <br/>Authors: Cander, Lj. R.; Rutherford Appleton Laboratory, Space Science & Technology Department, Radio Communications Research Unit, Chilton, Didcot, Oxon OX11 0QX, UK; Zolesi, B.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia <br/> <br/>Abstract: At the beginning of the new millennium, ionospheric physics and its application in new technologies are at a point of significant change and new development. Ionospheric studies in the past found application in the traditional areas of broadcast and terrestrial radio communications. It has become clear, in recent years, that an understanding of the ionosphere, as a part of the upper atmosphere, is central to the design of many modern communication, navigation and positioning systems. An important additional role has also been recognized in the areas of space weather science and services. This issue of the Journal of Atmospheric and Solar-Terrestrial Physics collects selected contributions presented at the Solar-Terrestrial Sciences session ST14 on "Space weather and RF communications: monitoring and modelling" held during the first General Assembly of the European Geosciences Union (Nice, France, 25–30 April 2004). <br/> <br/>Description: Preface to Journal of Atmospheric and Solar-Terrestrial Physics 67 (2005) Fri, 29 Jul 2005 22:58:59 GMT http://hdl.handle.net/2122/3972 Title: Spectral and fractal analyses of geomagnetic and riometric antarctic observations and a multidimensional index of activity <br/> <br/>Authors: De Santis, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; De Franceschi, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Perrone, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia <br/> <br/>Abstract: The Istituto Nazionale di Geofisica under the P.N.R.A. (National Program of Research in Antarctica) has the responsibility of acquiring geophysical observations at the Italian Antarctic Base of Terra Nova Bay. Among others, geomagnetic and riometric data can provide some new insights into local and global activity of the magnetosphere-ionosphere coupling. This article investigates some properties of these kinds of data by means of spectral and fractal analyses. In addition, a multidimensional index is derived from this single-point dataset to represent not only the local but also the global state of the magnetospheric activity. Thu, 29 May 1997 22:58:59 GMT