scholarly journals Assessment of Geomagnetically Induced Currents in Low Latitude Regions with respect to Severe Geomagnetic Storm over Solar Cycle 24

2021 ◽  
Vol 1768 (1) ◽  
pp. 012002
Author(s):  
Zatul Iffah Abd Latiff ◽  
Mohamad Huzaimy Jusoh ◽  
Kharismi Burhanudin
Keyword(s):  
Solar Cycle ◽  
Geomagnetic Storm ◽  
Geomagnetically Induced Currents ◽  
Low Latitude ◽  
Solar Cycle 24 ◽  
Induced Currents ◽  
Cycle 24

MAG-GIC: Geomagnetically Induced Currents risk hazard in the Portuguese power network

2020 ◽  
Author(s):  
Joana Alves Ribeiro ◽  
Maria Alexandra Pais ◽  
Fernando J. G. Pinheiro ◽  
Fernando A. Monteiro Santos ◽  
Pedro Soares
Keyword(s):  
Solar Cycle ◽  
Geomagnetic Storms ◽  
Power Network ◽  
The South ◽  
Geomagnetically Induced Currents ◽  
Crust And Upper Mantle ◽  
Solar Cycle 24 ◽  
Induced Currents ◽  
Cycle 24 ◽  
Shunt Reactors

<p>The MAG-GIC project has as a main goal to produce the chart of Geomagnetically Induced Currents (GIC) risk hazard in the distribution power network of Portugal mainland.</p><p>The study of GICs is important as they represent a threat for infrastructures such as power grids, pipelines, telecommunication cables, and railway systems. A deeper insight into GICs hazard may help in planning and designing more resilient transmission systems and help with criteria for equipment selection.</p><p>GICs are a result of variations in the ionospheric and magnetospheric electric currents, that cause changes in the Earth's magnetic field. The Coimbra magnetic observatory (COI) is one of the oldest observatories in operation in the world and the only one in Portugal mainland. It has been (almost) continuously monitoring the geomagnetic field variations since 1866, and in particular, it has registered the imprint of geomagnetic storms during solar cycle 24. Besides the geomagnetic storm signal, which represents the GICs driver, the crust and upper mantle electrical conductivities determine the amplitude and geometry of the induced electric fields.</p><p>To present a better approximation of the Earth's conductivity structure below the Portuguese power network, we initiated a campaign to acquire magnetotelluric (MT) data in a grid of 50x50 km all over the territory. Nonetheless, there already exist enough MT data to create a realistic 3D conductivity model in the south of Portugal.</p><p>The other important input is the electric circuit for the network grid. We benefit from the collaboration of the Portuguese high voltage power network (REN) company, in providing the grid parameters as resistances and transformer locations, thus allowing us to construct a more precise model. In particular, we implement in our model the effect of shield wires and shunt reactors resistances.</p><p>In this study, we present the results of GIC calculations for the south of Portugal for some of the strongest geomagnetic storms in the 20015-17 period recorded at COI during solar cycle 24. We will focus on the sensitivity of results concerning two different conductivity models and different values of the shielding circuit parameters and shunt reactors devices.</p>

Seasonal behavior of H component during solar cycle 24

2021 ◽  
Author(s):  
Yasmina Bouderba ◽  
Ener Aganou ◽  
Abdenaceur Lemgharbi
Keyword(s):  
Solar Activity ◽  
Solar Cycle ◽  
Horizontal Component ◽  
Low Latitude ◽  
Seasonal Behavior ◽  
The Earth ◽  
Earth Magnetic Field ◽  
Solar Cycle 24 ◽  
Minimum Solar Activity ◽  
Cycle 24

<p>In this work we will show the behavior of the horizontal component H of the Earth Magnetic Field (EMF) along the seasons during the period of solar cycle 24 lasting from 2009 to 2019. By means of  continuous measurements of geomagnetic components (X, Y) of the EMF, we compute the horizontal component H at the Earth’s surface. The data are recorded with a time resolution of one minute at Tamanrasset observatory in Algeria at the geographical coordinates of 22.79° North and 5.53° East. These data are available from the INTERMAGNET network. We find that the variation in amplitude of the hourly average of H component at low latitude changes from a season to another and it is greater at the maximum solar activity than at the minimum solar activity.</p><p><strong>Keywords:</strong> Solar cycle 24, Season, Horizontal component H. </p>

Low-latitude ionospheric response from GPS, IRI and TIE-GCM TEC to Solar Cycle 24

2019 ◽  
Vol 364 (12) ◽  
Author(s):  
S. S. Rao ◽  
Monti Chakraborty ◽  
Sanjay Kumar ◽  
A. K. Singh
Keyword(s):  
Solar Cycle ◽  
Low Latitude ◽  
Ionospheric Response ◽  
Solar Cycle 24 ◽  
Cycle 24

scholarly journals Characteristics of Low-latitude Coronal Holes near the Maximum of Solar Cycle 24

2017 ◽  
Vol 835 (2) ◽  
pp. 268 ◽  
Author(s):  
Stefan J. Hofmeister ◽  
Astrid Veronig ◽  
Martin A. Reiss ◽  
Manuela Temmer ◽  
Susanne Vennerstrom ◽  
...  
Keyword(s):  
Solar Cycle ◽  
Coronal Holes ◽  
Low Latitude ◽  
Solar Cycle 24 ◽  
Cycle 24

Investigation of the possibility of GIC development in Greece during the strongest magnetic storms of solar cycle 24 

2021 ◽  
Author(s):  
Adamantia Zoe Boutsi ◽  
Georgios Balasis ◽  
Ioannis A. Daglis ◽  
Kanaris Tsinganos ◽  
Omiros Giannakis
Keyword(s):  
Solar Cycle ◽  
Magnetic Storms ◽  
Geoelectric Field ◽  
Storm Events ◽  
Power Networks ◽  
Geomagnetically Induced Currents ◽  
Middle Latitudes ◽  
Solar Cycle 24 ◽  
Cycle 24 ◽  
Index Value

<p>Geomagnetically Induced Currents (GIC) constitute an integral part of the space weather research and a subject of ever-growing attention for countries located in the low and middle latitudes. A series of recent studies highlights the importance of considering GIC risks for the Mediterranean region. Here, we exploit data from the HellENIc GeoMagnetic Array (ENIGMA), which is located in Greece, complemented by magnetic observatories in Italy, to calculate corresponding values of the GIC index, i.e., a proxy of the geoelectric field calculated entirely from geomagnetic field variations. We perform our analysis for the most intense magnetic storms (Dst<-150 nT) of solar cycle 24. Our results show a good correlation between the storm sudden commencement (SSC) and an increase of the GIC index value. These investigations indicate that despite the elevated amplitude of the GIC index the associated risk remains at low level for the power networks in Greece and Italy during the considered storm events.</p>

scholarly journals The Solar Event of 14 – 15 July 2012 and Its Geoeffectiveness

Solar Physics ◽  
2020 ◽  
Vol 295 (10) ◽  
Author(s):  
Agnieszka Gil ◽  
Renata Modzelewska ◽  
Szczepan Moskwa ◽  
Agnieszka Siluszyk ◽  
Marek Siluszyk ◽  
...  
Keyword(s):  
Solar Cycle ◽  
Geomagnetic Storm ◽  
Transmission Lines ◽  
Large Angle ◽  
Solar Origin ◽  
Electric Transmission Lines ◽  
Solar Cycle 24 ◽  
Cycle 24 ◽  
Ap Index ◽  
Halo Coronal Mass Ejection

Abstract During Solar Cycle 24, which started at the end of 2008, the Sun was calm, and there were not many spectacular geoeffective events. In this article, we analyze the geomagnetic storm that happened on 15 July 2012 during the 602nd anniversary of the Polish Battle of Grunwald, thus we propose this event to be called the “Battle of Grunwald Day Storm”. According to NOAA scale, it was a G3 geomagnetic storm with a southward component of the heliospheric magnetic field, $Bz$ B z , falling to −20 nT, minimum Dst index of −139 nT, AE index of 1368 nT, and Ap index of 132 nT. It was preceded by a solar flare class X1.4 on 12 July. This geomagnetic storm was associated with the fast halo coronal mass ejection at 16:48:05 UT on 12 July, first appearance in the Large Angle and Spectroscopic Coronagraph C2, with a plane-of-sky speed of 885 km s−1 and maximum of 1415 km s−1. This geomagnetic storm was classified as the fourth strongest geomagnetic storm of Solar Cycle 24. At that time, a significant growth in the failures of the Polish electric transmission lines was observed, which could have a solar origin.

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