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Search Results: 1 - 10 of 7869 matches for " space weather "
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On the Predictive Ability of Geomagnetic Disturbances from Solar Wind Measurements at Separated Solar Longitude  [PDF]
Wataru Miyake, Tsutomu Nagatsuma
International Journal of Astronomy and Astrophysics (IJAA) , 2012, DOI: 10.4236/ijaa.2012.22009
Abstract: In-situ solar wind measurement at a solar longitude separated from the earth in interplanetary space is expected to provide a great progress in practical space weather forecast, which has been confirmed by some recent studies. We introduce geoeffective solar wind conditions in correlation analysis between STEREO and ACE measurements. We sort solar wind data of ACE by using geomagnetic condition, and evaluate actual ability for predicting geoeffective solar wind arrival at ACE from STEREO-A and B solar wind measurement, by assuming simple corotating structures in interplanetary space. The results show that geomagnetic disturbances are more difficult to be predicted than quiet intervals, suggesting that the simple correlation method of solar wind measurement at separated solar longitude is not enough for accurately predicting geomagnetic disturbances, even though the correlation seems generally high. Although in-situ solar wind monitoring at a vantage point trailing behind the earth would definitely improve the prediction capability of solar wind structure arriving at the terrestrial plasma environment, we emphasize that the predictive ability of geoeffective disturbances would still remain low. We suggest that more sophisticated prediction schemes should be developed.
Progress in space weather modeling in an operational environment
Tsagouri Ioanna,Belehaki Anna,Bergeot Nicolas,Cid Consuelo
Journal of Space Weather and Space Climate , 2013, DOI: 10.1051/swsc/2013037
Abstract: This paper aims at providing an overview of latest advances in space weather modeling in an operational environment in Europe, including both the introduction of new models and improvements to existing codes and algorithms that address the broad range of space weather’s prediction requirements from the Sun to the Earth. For each case, we consider the model’s input data, the output parameters, products or services, its operational status, and whether it is supported by validation results, in order to build a solid basis for future developments. This work is the output of the Sub Group 1.3 “Improvement of operational models” of the European Cooperation in Science and Technology (COST) Action ES0803 “Developing Space Weather Products and services in Europe” and therefore this review focuses on the progress achieved by European research teams involved in the action.
The COST example for outreach to the general public: I love my Sun
Tulunay Yurdanur,Bock Crosby Norma,Tulunay Ersin,Calders Stijn
Journal of Space Weather and Space Climate , 2013, DOI: 10.1051/swsc/2013026
Abstract: It is important to educate children about the important role that the Sun has in their lives. This paper presents an educational outreach tool entitled “I Love My Sun” that has been developed for school children in the approximate age range of 7 through 11 years. The main objective of this tool is to make children aware of space weather, the Sun, Sun-Earth relations and how they, the children, are part of this global picture. Children are given a lecture about the Sun. The lecture is preceded and followed by the children drawing a picture of the Sun. In this paper the background behind the “I Love My Sun” initiative is given and it is described how to perform an “I Love My Sun”. The main results from events in Turkey, Belgium, Ukraine and Serbia are presented.
Ondas de choque n?o colisionais no espa?o interplanetário
Echer, E.;Alves, M.V.;Gonzalez, W.D.;
Revista Brasileira de Ensino de Física , 2006, DOI: 10.1590/S0102-47442006000100008
Abstract: an introduction to the collisionless shock waves propagating through the interplanetary space is presented. basic concepts related to the propagation of information in ordinary gases and plasmas are reviewed. the wave modes in plasma and their steepening to shock waves are discussed. the shocks found in interplanetary space - planetary bow shocks, transient shocks driven by interplanetary coronal mass ejections and recurrent shocks due to the interaction of high-speed and low-speed solar wind streams are also discussed. shocks can also be classified according to their propagation direction - away or toward the sun (forward and reverse shocks) and according if they are fast or slow mode magnetosonic waves steepened (fast and slow shocks). finally, an example of calculated parameters for a transient interplanetary shock observed in solar wind near earth and its magnetospheric effects is presented.
Space Weather: Terrestrial Perspective
Pulkkinen Tuija
Living Reviews in Solar Physics , 2007,
Abstract: Space weather effects arise from the dynamic conditions in the Earth’s space environment driven by processes on the Sun. While some effects are influenced neither by the properties of nor the processes within the Earth’s magnetosphere, others are critically dependent on the interaction of the impinging solar wind with the terrestrial magnetic field and plasma environment. As the utilization of space has become part of our everyday lives, and as our lives have become increasingly dependent on technological systems vulnerable to space weather influences, understanding and predicting hazards posed by the active solar events has grown in importance. This review introduces key dynamic processes within the magnetosphere and discusses their relationship to space weather hazards.
Use of rai and wavelet of analysis of the influence of the temporal multi-scales in the rainfall of the Mundaú River watershed
Djane Fonseca da Silva,Francisco de Assis Salviano de Sousa,Mary Toshie Kayano
Engenharia Ambiental : Pesquisa e Tecnologia , 2009,
Abstract: The variations of the rainfall in a region of the Mundaú river watershed, at state of Alagoas, Brazil, had been studied using the rainfall anomaly index (RAI) and the Wavelet Analysis. This method involves transformation of a one-dimensional series in a time space and frequency, allowing determining the dominant scales of variability and its secular variations. The results had shown that the precipitation variability in the two regions is defined by located secular multi-scales in certain intervals of time. However, on inter-annual variability to the ENSO cycle and the decadal variability of the scales had influenced in the local pluviometric variability.
New observation strategies for the solar UV spectral irradiance
Cessateur Ga?l,Lilensten Jean,Dudok de Wit Thierry,BenMoussa Ali
Journal of Space Weather and Space Climate , 2012, DOI: 10.1051/swsc/2012016
Abstract: Many applications in space weather and in space situational awareness require continuous solar spectral irradiance measurements in the UV, and to a lesser degree in the visible band. Most space-borne solar radiometers are made out of two different parts: (i) a front filter that selects the passband and (ii) a detector that is usually based on silicon technology. Both are prone to degradation, which may be caused either by the degradation of the filter coating due to local deposition or to structural changes, or by the degradation of the silicon detector by solar radiative and energetic particle fluxes. In this study, we provide a theoretical analysis of the filter degradation that is caused by structural changes such as pinholes; contamination-induced degradation will not be considered. We then propose a new instrumental concept, which is expected to overcome, at least partially, these problems. We show how most of the solar UV spectrum can be reconstructed from the measurement of only five spectral bands. This instrumental concept outperforms present spectrometers in terms of degradation. This new concept in addition overcomes the need for silicon-based detectors, which are replaced by wide band gap material detectors. Front filters, which can contribute to in-flight degradation, therefore are not required, except for the extreme-UV (EUV) range. With a small weight and a low telemetry, this concept may also have applications in solar physics, in astrophysics and in planetology.
SWIFF: Space weather integrated forecasting framework
Lapenta Giovanni,Pierrard Viviane,Keppens Rony,Markidis Stefano
Journal of Space Weather and Space Climate , 2013, DOI: 10.1051/swsc/2013027
Abstract: SWIFF is a project funded by the Seventh Framework Programme of the European Commission to study the mathematical-physics models that form the basis for space weather forecasting. The phenomena of space weather span a tremendous scale of densities and temperature with scales ranging 10 orders of magnitude in space and time. Additionally even in local regions there are concurrent processes developing at the electron, ion and global scales strongly interacting with each other. The fundamental challenge in modelling space weather is the need to address multiple physics and multiple scales. Here we present our approach to take existing expertise in fluid and kinetic models to produce an integrated mathematical approach and software infrastructure that allows fluid and kinetic processes to be modelled together. SWIFF aims also at using this new infrastructure to model specific coupled processes at the Solar Corona, in the interplanetary space and in the interaction at the Earth magnetosphere.
A Nonlinear Autoregressive Approach to Statistical Prediction of Disturbance Storm Time Geomagnetic Fluctuations Using Solar Data  [PDF]
Joseph M. Caswell
Journal of Signal and Information Processing (JSIP) , 2014, DOI: 10.4236/jsip.2014.52007

A nonlinear autoregressive approach with exogenous input is used as a novel method for statistical forecasting of the disturbance storm time index, a measure of space weather related to the ring current which surrounds the Earth, and fluctuations in disturbance storm time field strength as a result of incoming solar particles. This ring current produces a magnetic field which opposes the planetary geomagnetic field. Given the occurrence of solar activity hours or days before subsequent geomagnetic fluctuations and the potential effects that geomagnetic storms have on terrestrial systems, it would be useful to be able to predict geophysical parameters in advance using both historical disturbance storm time indices and external input of solar winds and the interplanetary magnetic field. By assessing various statistical techniques it is determined that artificial neural networks may be ideal for the prediction of disturbance storm time index values which may in turn be used to forecast geomagnetic storms. Furthermore, it is found that a Bayesian regularization neural network algorithm may be the most accurate model compared to both other forms of artificial neural network used and the linear models employing regression analyses.

Editorial policies at SWSC
Belehaki Anna,Lilensten Jean
Journal of Space Weather and Space Climate , 2013, DOI: 10.1051/swsc/2013035
Abstract: Reaching the end of the second year of the Journal of Space Weather and Space Climate, we present an overview of important issues that resulted in the clarification of our editorial policy, mainly triggered by the response of the scientific communities related to SWSC. We conclude this editorial with future perspectives concerning the impact factor and the charging policy.
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