المؤلفون: Lanabere, Vanina, Dimmock, Andrew P., Rosenqvist, L., Juusola, L., Viljanen, A., Johlander, A., Odelstad, E.

المصدر: Space Weather. 21(12)

مصطلحات موضوعية: space weather, GICs, power grid, geoelectric field, geomagnetic disturbances, substorm

الوصف: Geomagnetic storms can produce large perturbations on the Earth magnetic field. Through complex magnetosphere-ionosphere coupling, the geoelectric field (E) and geomagnetic field (B) are highly perturbed. The E is the physical driver of geomagnetically induced currents. However, a statistical study of the E in Sweden has never been done before. We combined geomagnetic data from the International Monitor for Auroral Geomagnetic Effects network in Northern Europe with a 3-D structure of Earth's electrical conductivity in Sweden as the input of a 1-D model to compute the E between 2000 and 2018. Northwestern Sweden presents statistically larger E magnitudes due to larger |dB/dt| variations in the north than in the south of Sweden and relative lower conductivity in the west compared to central and eastern Sweden. In contrast, the 15 strongest daily maximum |E| events present more frequently a maximum magnitude in central Sweden (62.25 degrees N) and their relative strengths are not the same for all latitudes. These results highlight the different regional response to geomagnetic storms, which can be related to ground conductivity variability and the complex magnetosphere-ionosphere coupling mechanisms. Solar storms represent a major threat to Earth's technology and therefore affect society and the economy. Historically, the main effects were related to electric power grid failures leaving many people without electricity for several hours. In order to prevent this from happening again, it is necessary to understand the temporal and spatial variability of the Earth's electric field in regions where electric power grids are placed. This study combines ground measurements of the magnetic fields in Finland and Estonia and ground conductivity maps in Sweden to estimate the ground electric fields in Sweden. A statistical analysis from 2000 to 2018 shows that the probability to find stronger daily maximum electric field magnitude (|E|) is higher in northwestern Sweden. However, the 15 strongest |E| events were found in the central region of Sweden. Furthermore, 80% of the electric power grid failure reports in Sweden during the period, correspond to events where the strongest daily maximum |E| were observed at 62.25 degrees N. This implies that a better understanding of the local geoelectric field and driving processes are required. The daily maximum geoelectric field magnitude is statistically larger in northwestern Sweden than in central and southern SwedenThe 15 strongest daily maximum geoelectric field events were more frequent in central Sweden than in northern SwedenThe 15 strongest events at each latitude are different, so the geoelectric field presents an important regional variability

وصف الملف: electronic

URL الوصول: https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-520510
https://doi.org/10.1029/2023SW003588
https://uu.diva-portal.org/smash/get/diva2:1827676/FULLTEXT01.pdf

المؤلفون: Démoulin, Pascal^Aff1, Dasso, Sergio^{Aff2, Aff3}, Janvier, Miho, Lanabere, Vanina

المصدر: Solar Physics: A Journal for Solar and Solar-Stellar Research and the Study of Solar Terrestrial Physics. 294(12)

المؤلفون: Lanabere, Vanina Carina

المساهمون: Dasso, Sergio Ricardo

المصدر: Biblioteca Digital (UBA-FCEN)
Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
instacron:UBA-FCEN

مصطلحات موضوعية: CINTURONES DE RADIACION, INTERPLANETARY MEDIUM, NUBES MAGNETICAS, MEDIO INTERPLANETARIO, RELACION SOLAR TERRESTRE, SPACE WEATHER, MAGNETIC CLOUDS, METEOROLOGIA DEL ESPACIO, RADIATION BELTS, SOLAR TERRESTRIAL RELATIONS

الوصف: La meteorología del espacio (ME) describe y estudia las condiciones del Sol, medio interplanetario, magnetósfera, ionósfera, y atmósfera neutra. Condiciones particulares en este sistema pueden inuir en el funcionamiento y la abilidad de los sistemas tecnológicos espaciales y poner en peligro la salud o la vida humana en el espacio. Eventos de ME pueden dar lugar a grandes perturbaciones en el entorno terrestre, conocido como tormentas geosféricas. Las más intensas generalmente están asociadas con eventos interplanetarios denominados nubes magnéticas (NMs) interplanetarias. La conguración magnética de estas estructuras tiene un gran efecto sobre el ujo de partículas energéticas en el entorno espacial terrestre. Uno de los escenarios físicos afectados durante una tormenta geosférica es la composición de las partículas energéticas de los cinturones de radiación de Van Allen. Éste presenta un gran interés dado que un aumento en el flujo de electrones energéticos puede afectar el funcionamiento y tiempo de vida de satélites. Este trabajo de tesis presenta dos enfoques de gran interés para la ME. Por un lado, un enfoque cientíco para estudiar la conguración magnética de NMs en el entorno interplanetario de la Tierra y ujos extremos de partículas energéticas en el cinturón de Van Allen, los cuales son seriamente afectados por NMs. Por otro lado, un enfoque operativo, el cual se centra en el monitoreo sistemático de la cadena de procesos desde el Sol hasta la Tierra y el desarrollo de nuevos productos proto-operativos con valor agregado para mejorar la caracterización de los eventos. Space weather (SW) describes and studies the conditions in the Sun, magnetosphere, ionosphere, and neutral atmosphere. Particular conditions in this system can affect the operation and reliability of space technology systems and can endanger human life or health in space. SW events can lead to major disturbances in Earth’s environment, known as geospheric storms. The most intense geospheric storms are generally associated with interplanetary events called interplanetary magnetic clouds (MCs). The magnetic configuration of these structures has a major effect on the flux of energetic particles in the space near Earth. One of the physical scenarios affected during a geospheric storm is the composition of energetic particles of the Van Allen radiation belts. This is of great interest since an increase in the flux of energetic electrons can affect the operation and lifetime of satellites. This thesis presents two approaches of great interest to SW. On the one hand, a scientific approach to study the magnetic conguration of interplanetary MCs in the Earth’s space environment and energetic particle fluxes in the Van Allen radiation belts, that are severely affected by MCs. On the other hand, an operational approach focuses on systematic monitoring of the processes chain from the Sun to the Earth and the development of new and value-added proto-operative products to improve the characterization of events. Fil: Lanabere, Vanina Carina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.

وصف الملف: application/pdf

URL الوصول: https://explore.openaire.eu/search/publication?articleId=od______3056::0fdf182843dbc5a0b8922d2ecd37d43c

Alternate Title: ANALYSIS OF EXTREME ENERGETIC ELECTRON FLUXES IN THE OUTER RADIATION BELT AND SOUTH ATLANTIC MAGNETIC ANOMALY. (English)

المؤلفون: Lanabere, Vanina, Dasso, Sergio

المصدر: Meteorologica; 2021, Vol. 46 Issue 2, p12-26, 15p

مصطلحات موضوعية: CUMULATIVE distribution function, RADIATION belts, ELECTRON distribution, SPACE environment, TERRESTRIAL radiation, ASTROPHYSICAL radiation, EXTREME value theory, ARTIFICIAL satellites

Abstract (English): The van Allen radiation belts are regions in the terrestrial space environment that present energetic ions and electrons trapped by the geomagneti "field. The increase of fluxes for these energetic particles during geomagnetic storms has a major interest for Space Weather, mainly due to the impaction satellites and human activities in space. A detailed knowledge of the extreme fluxes reached for different electron energies as well as the frequencies of occurrence is essential for the specific design of satellites and for the development of satellite technologies. The main purpose of the present work is to study the extreme electron fluxes in the terrestrial radiation belts, for an energy range between 0.249 MeV and 0.802 MeV at 660 km of altitude above the Earth Surface, using measurements made by the detector ICARE-NG/Carmen-1 on board the polar Argentinean satellite SAC-D. A statistical analysis based on the extreme value theory was implemented for the daily, average electron flux in the outer radiation belt and in the South Atlantic Magnetic Anomaly (SAMA). We found that the cumulative distribution function of the daily averaged electron flux is likely to have a finite upper limit in the. cor? of the outer radiation belt (4.0 < L < 4.5) and for electron energies between E > 0.270 MeV and E > 0.413 MeV. The extreme electron flux value expected in 1, 10, 50 and 100 years were computed at L = 4.5, showing a general decreasing trend with increasing energy. Although the results in the SAMA suggest that the cumulative distribution function of the electron flux is likely to not have a finite upper limit, this result is not statistically significant. The results presented in this work are important for the satellite engineers to improve devices and materials for the development of future satellites. Also, the likely magnitude of an extreme event in the outer radiation belt is of interest to the satellite insurers to help them evaluate potential disaster scenarios. [ABSTRACT FROM AUTHOR]

Abstract (Spanish): Los cinturones de radiación de van Allenson regiones en el entorno espacial terrestre que presentan iones y electrón energéticos atrapados por el campo geomagnético. El incremento del flujo para estas partículas energéticas durante tormentas geomagnéticas tiene un gran interés para la meteorología del espacio, debido principalmente al impacto que tiene sobre los satélites y la actividad espacial humana. Un entendimiento detallado dé los flujos extremos alcanzados por electrones a diferentes energías, así como la frecuencia de ocurrencia es esencial para el diseño específico de satélite y para el desarrollo de tecnologías satelitales. El objetivo principal de este trabajo es estudiar los flujos extremos de electrones en los cinturones de radiación terrestre, para un rango de energías entre 0,249 MeV y 0,802 MeV a 660 km de altitud sobre lauperficie de la Tierra, usando mediciones realizadas por el detector IC ARE-NG/Carmen-1 a bordo del satélite polar argent ino SAC-D. Un estudio estadístiqojbasado en la teoría de valores extremos se ha implementado al promedio diario del flujo de electrones en el cinturón de radiación exterior y en la Anomalía Magnética del Atlántico Sur (AMAS). Encontramos que la función de distribución acumulada'del promedio diario del flujo de electrones parece tener un límite superior finito en el centro del cinturón de radiación exterior (4,0 < L < 4, 5) y para electrones con energías entre E > 0,270 MeV y E > 0,413 MeV. El flujo de electrones extremo esperado en tiempos de 10, 50 y 100 años fueron calculados para L = 4,5 mostrando, en general, una tendencia a disminuir mientras aumenta la energía. A pesar dmque los resultados en la AMAS sugieren que la función de distribución acumulada del flujo de electrones no tiene un límite superior finito, no es posible concluir con certeza este resultado por no tener significancia estadística. Los resultados presentados en este trabajo son importantes para los ingenieros de satélites, de cara'a mejorar dispositivos y materiales para el desarrollo de los futuros satélites. También, la magnitud esperada de un evento extremo en el cinturón de radiación exterior es de interés para las aseguradoras satelitales de cara a evaluar potenciales escenarios de desastres. [ABSTRACT FROM AUTHOR]

: Copyright of Meteorologica is the property of Centro Argentino de Meteorologos and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Lanabere, Vanina, Dasso, Sergio, Foullon, Claire, Malandraki, Olga E.

المصدر: Proceedings of the International Astronomical Union; Jul2017, Vol. 13 Issue S335, p128-131, 4p

مستخلص: The main aim of this work is to study the frequency of extreme Space Weather events, in particular to analyse the tails of the daily averaged electron fluxes distribution function for different channels of energy between 0.249–1.192 MeV measured at ~ 600 km of altitude with the particle detector ICARE-NG/CARMEN-1 on board argentinian polar satellite SAC-D. An extreme value theory was applied to estimate the maximum values of the electron flux in the outer radiation belt for different return levels. We found that the cumulative distribution function of the extreme electron fluxes presents a finite upper limit in (1) the core of the outer radiation belt for the lower energy channels and (2) in the inner edge of the outer radiation belt for energy channels larger than 0.653 keV. The results presented in this work are important to characterise Space Weather conditions. [ABSTRACT FROM AUTHOR]

: Copyright of Proceedings of the International Astronomical Union is the property of Cambridge University Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)