Articles | Volume 35, issue 6
Ann. Geophys., 35, 1201–1218, 2017
https://doi.org/10.5194/angeo-35-1201-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Special issue: Space weather connections to near-Earth space and the...
Regular paper 08 Nov 2017
Regular paper | 08 Nov 2017
Climatology and modeling of ionospheric scintillations and irregularity zonal drifts at the equatorial anomaly crest region
Marcio T. A. H. Muella et al.
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This work presents an analysis of the scintillation onset over the southern Brazil based on data from two solar maximum periods and simulation of the ionospheric conditions before the scintillation onset. The results shows some patterns which may help to prevent several satellite-based technological applications suffering disruptions due to scintillation issues.
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The impact of large-scale deforestation and the physiological effects of elevated atmospheric CO2 on Amazon rainfall are systematically compared in this study. Our results are remarkable in showing that the two disturbances cause equivalent rainfall decrease, though through different causal mechanisms. These results highlight the importance of not only curbing regional deforestation but also reducing global CO2 emissions to avoid climatic changes in the Amazon.
Telmo dos Santos Klipp, Adriano Petry, Jonas Rodrigues de Souza, Eurico Rodrigues de Paula, Gabriel Sandim Falcão, and Haroldo Fraga de Campos Velho
Ann. Geophys., 38, 347–357, https://doi.org/10.5194/angeo-38-347-2020, https://doi.org/10.5194/angeo-38-347-2020, 2020
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This work presents an analysis of the scintillation onset over the southern Brazil based on data from two solar maximum periods and simulation of the ionospheric conditions before the scintillation onset. The results shows some patterns which may help to prevent several satellite-based technological applications suffering disruptions due to scintillation issues.
Loredana Perrone, Angelo De Santis, Cristoforo Abbattista, Lucilla Alfonsi, Leonardo Amoruso, Marianna Carbone, Claudio Cesaroni, Gianfranco Cianchini, Giorgiana De Franceschi, Anna De Santis, Rita Di Giovambattista, Dedalo Marchetti, Francisco J. Pavòn-Carrasco, Alessandro Piscini, Luca Spogli, and Francesca Santoro
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Ionosonde data and crustal earthquakes with magnitude M ≥ 6.0 observed in Greece during the 2003–2015 period were examined. The ionospheric anomalies are identified on the observed variations of the sporadic E-layer parameters and foF2 at the Athens observatory. The empirical relationships between ionospheric anomalies and the earthquake magnitude and the epicentral distance are obtained. The possibility of using the relationships obtained for earthquake prediction is finally discussed.
Angelo De Santis, Gianfranco Cianchini, Rita Di Giovambattista, Cristoforo Abbattista, Lucilla Alfonsi, Leonardo Amoruso, Marianna Carbone, Claudio Cesaroni, Giorgiana De Franceschi, Anna De Santis, Alessandro Ippolito, Dedalo Marchetti, Luca Martino, Francisco Javier Pavòn-Carrasco, Loredana Perrone, Alessandro Piscini, Mario Luigi Rainone, Luca Spogli, and Francesca Santoro
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Geosystemics studies the Earth system as a whole, focusing on the possible coupling among the Earth layers, and using universal entropic tools. In this paper, earthquakes are considered as a long term chain of processes involving the coupling of the solid earth with the above neutral and ionized atmosphere, and finally culminating with the main rupture along the fault of concern. Some case studies are presented.
Patricia Mara de Siqueira Negreti, Eurico Rodrigues de Paula, and Claudia Maria Nicoli Candido
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The total electron content (TEC) is being extensively used to monitor the ionospheric behavior under geomagnetically quiet and disturbed conditions. The TEC presents significant changes during geomagnetic disturbed periods, causing degradation of signals in navigation systems and satellite communication. The geomagnetically disturbed periods occur due to enhanced solar activity and we show that the TEC presents intensifications not only during geomagnetic storms but also during HILDCAA events.
Emilia Correia, Luca Spogli, Lucilla Alfonsi, Claudio Cesaroni, Adriana M. Gulisano, Evan G. Thomas, Ray F. Hidalgo Ramirez, and Alexandre A. Rodel
Ann. Geophys., 35, 1113–1129, https://doi.org/10.5194/angeo-35-1113-2017, https://doi.org/10.5194/angeo-35-1113-2017, 2017
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Ionospheric disturbances observed in Antarctica during a moderately strong geomagnetic storm caused by the impact of a coronal mass ejection from the Sun are presented here. The ionosphere behavior was analyzed using GNSS and ionosonde observations at middle and high latitudes. The results showed that the impact promptly affected the ionosphere from the Equator to the high latitudes, resulting in strong irregularities, particularly at middle and high latitudes, which can affect GPS users.
Fabiano S. Rodrigues, Eurico R. de Paula, and Gebreab K. Zewdie
Ann. Geophys., 35, 393–402, https://doi.org/10.5194/angeo-35-393-2017, https://doi.org/10.5194/angeo-35-393-2017, 2017
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We present results of Capon's method for the estimation of in-beam images of equatorial spread F (ESF) irregularities observed by the São Luís radar interferometer. Results of numerical simulations show that, despite the short baselines of the system, the method is capable of distinguishing localized features with kilometric scale sizes (zonal direction). Results from the application of Capon’s method to actual measurements show that it is able to resolve features expected to occur in ESF.
J. M. Smith, F. S. Rodrigues, and E. R. de Paula
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P. Prikryl, R. Ghoddousi-Fard, L. Spogli, C. N. Mitchell, G. Li, B. Ning, P. J. Cilliers, V. Sreeja, M. Aquino, M. Terkildsen, P. T. Jayachandran, Y. Jiao, Y. T. Morton, J. M. Ruohoniemi, E. G. Thomas, Y. Zhang, A. T. Weatherwax, L. Alfonsi, G. De Franceschi, and V. Romano
Ann. Geophys., 33, 657–670, https://doi.org/10.5194/angeo-33-657-2015, https://doi.org/10.5194/angeo-33-657-2015, 2015
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A series of interplanetary coronal mass ejections in the period 7–17 March 2012 caused geomagnetic storms that strongly affected the high-latitude ionosphere in the Northern and Southern Hemisphere. Interhemispheric comparison of GPS phase scintillation reveals commonalities as well as asymmetries, as a consequence of the coupling between the solar wind and magnetosphere. The interhemispheric asymmetries are primarily caused by the dawn-dusk component of the interplanetary magnetic field.
R. Y. C. Cueva, E. R. de Paula, and A. E. Kherani
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F. S. Rodrigues, E. B. Shume, E. R. de Paula, and M. Milla
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In this study we analyzed ~ 17 years of GPS data from receivers installed in the observatory of Cachoeira Paulista, Brazil. We statistically analyzed the occurrence of GPS signal amplitude fluctuations caused by irregularities in the Earth's upper atmosphere. These signal fluctuations are known to provoke positional errors for GPS users. The results revealed that the secular variations in the Earth’s magnetic field are affecting the climatology of such GPS signal fluctuations.
In this study we analyzed ~ 17 years of GPS data from receivers installed in the observatory of...