Variations of geomagnetic H, D, and Z field intensities on quiet days at west african latitudes
Authors:
Obiekezie, T.; Okeke, F.
Summary:
In the framework of the French participation to the International Equatorial Electrojet
Year (IEEY), a network of ten electro-magnetic stations was installed at African latitudes.
These stations measured digitally the three components of the magnetic field and the two components of the telluric electric field, and operated over a period of 20 months. The magnetic
data are used to study the variations of geomagnetic H, D, and Z field intensities on quiet days.
Night-time variations in all the three geomagnetic elements were observed, which suggests
there is a night-time current in the West African dip equatorial latitudes. The pattern of variations observed in H element, which peaks around noon, is seen to be due to the equatorial electrojet current. A reverse current called the counter electrojet current was noticed on some days.
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Crossref
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CERIF
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BibTeX
@article{ibn_4178,
author = {Obiekezie, T.N. and Okeke, F.N.},
title = {Variations of geomagnetic H, D, and Z field intensities on quiet days at west african latitudes},
journal = {Moldavian Journal of the Physical Sciences},
year = {2009},
volume = {8 (3-4)},
pages = {366-372},
month = {Sep},
abstract = {(EN) In the framework of the French participation to the International Equatorial Electrojet
Year (IEEY), a network of ten electro-magnetic stations was installed at African latitudes.
These stations measured digitally the three components of the magnetic field and the two components of the telluric electric field, and operated over a period of 20 months. The magnetic
data are used to study the variations of geomagnetic H, D, and Z field intensities on quiet days.
Night-time variations in all the three geomagnetic elements were observed, which suggests
there is a night-time current in the West African dip equatorial latitudes. The pattern of variations observed in H element, which peaks around noon, is seen to be due to the equatorial electrojet current. A reverse current called the counter electrojet current was noticed on some days. },
url = {https://ibn.idsi.md/vizualizare_articol/4178},
}
DataCite
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Dublin Core
<?xml version='1.0' encoding='utf-8'?> <oai_dc:dc xmlns:dc='http://purl.org/dc/elements/1.1/' xmlns:oai_dc='http://www.openarchives.org/OAI/2.0/oai_dc/' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd'> <dc:creator>Obiekezie, T.N.</dc:creator> <dc:creator>Okeke, F.N.</dc:creator> <dc:date>2009-09-05</dc:date> <dc:description xml:lang='en'>In the framework of the French participation to the International Equatorial Electrojet Year (IEEY), a network of ten electro-magnetic stations was installed at African latitudes. These stations measured digitally the three components of the magnetic field and the two components of the telluric electric field, and operated over a period of 20 months. The magnetic data are used to study the variations of geomagnetic H, D, and Z field intensities on quiet days. Night-time variations in all the three geomagnetic elements were observed, which suggests there is a night-time current in the West African dip equatorial latitudes. The pattern of variations observed in H element, which peaks around noon, is seen to be due to the equatorial electrojet current. A reverse current called the counter electrojet current was noticed on some days. </dc:description> <dc:source>Moldavian Journal of the Physical Sciences 8 (3-4) 366-372</dc:source> <dc:title>Variations of geomagnetic H, D, and Z field intensities on quiet days at west african latitudes</dc:title> <dc:type>info:eu-repo/semantics/article</dc:type> </oai_dc:dc>fără li­chidități. Așadar, cele mai noi tipuri de fraudă întâlnite sunt: phi­shing-ul, skimming-ul, interpretarea email-urilor, malware, inginerie socială.</p><p>Cu o atenție deosebită autorul accentuează tipul de fraudă ingineria socială.<strong> </strong>Unele dintre cele mai eficiente atacuri cibernetice vizează oameni. Ingineria socială<strong> </strong>este o formă de manipulare în care atacatorii imit o sursă de încredere pentru a convinge oamenii să îndeplinească anumite sarcini dorite de infractor. Funcționează astfel: în primul rând, un atacator va suna sau va trimite un e-mail la un birou de asistență și se dă drept țintă. Va spune că și-a uitat parola și, de obicei, va contura o poveste credibilă în acest sens. Analizând datele statis­tice, putem constata că nu este de mirare că prevalența acestor atacuri este foarte mare și crește tot timpul. În 2017, 76% dintre profesioniștii din domeniul securității informației au fost vizați de atacuri de inginerie socială prin telefon sau e-mail. În 2018, această cifră a sărit la 83%. Unul dintre cei mai cunoscuți ingineri sociali din istorie este Kevin Mitnik. Kevin Mitnik susține că este mai ușor să obții o parolă prin fraudă decât să încerci să spargi un sistem de securitate [3].</p><p>Conform rezultatelor oferite de către Banca Centrală Europeană privind tranzacțiile frauduloase în anul 2019, avem următoarele re­zultate: 73% din valoarea tranzacțiilor frauduloase au fost efectuate fără card (<em>card-not-present</em>), precum plățile pe internet sau telefon, 19% dintre tranzacții la terminalele POS, iar 8% dintre acestea la ATM-uri. De altfel, se constată o creștere a fraudelor efectuate în absența cardului fizic, față de cele cu card [4].</p><p>Pentru a putea preveni și înlătura posibilitățile atacurilor frau­du­loa­se în domeniul bancar, poate fi propusă utilizarea metodelor de se­cu­ri­ta­te. Termenul de „inteligenţă artificială”, cum a afirmat Raymond Kur­­zweil, un pionier în domeniul inteligenței artificiale, este „arta de a crea mașini care să îndeplinească funcții care ar necesita inteligență da­că ar fi îndeplinite de oameni” [2]. Inteligența artificială (IA) se re­fe­ră la sisteme sau la maşini care imit inteligenţa umană, pentru a efec­tua diverse activităţi şi care se pot îmbunătăţi pe baza infor­ma­ţii­lor pe care le colectează. Câteva exemple: Boţii de chat utilizează IA pentru a înţelege mai repede problemele clienţilor şi pentru a oferi răs­pun­suri mai eficiente. Asistenţii inteligenţi utilizează IA pentru a ana­li­za informaţiile esenţiale din seturile de date mari de text, pentru a îmbunătăţi programarea.</p><p>În Republica Moldova, acest tip de securitate este folosit de către B.C. Victoriabank prin sistemul <em>open way grup</em>. Acest sistem înre­gist­rează ansamblul tranzacțiilor efectuate de către client de pe contul său, în momentul în care are loc efectuarea unei plăți în valoare mai mare comparativ cu cele precedente atunci sistemul acționează, iar prin acumularea mai multor informații despre tranzacția suspectă se acceptă sau respinge efectuarea plății.</p><p><strong>În concluzie</strong>, menţionăm că este necesar de a cere de la tehnologie un flux informaţional care va contribui la îmbunătăţirea și securizarea serviciilor bancare, dar şi la implementarea unor sisteme noi pe piaţa ban­cară, care ar contribui la prevenirea riscurilor. Experienţa inter­na­ţio­­nală în domeniu va oferi posibilitatea sistemului bancar din Re­pub­li­ca Moldova să se dezvolte în aşa fel ca activitatea acestuia să fie plă­cu­tă, în primul rând, pentru client, deoarece clientul va avea încredere în acea bancă care îi va oferi securitate la nivelul cel mai înalt pentru el.</p></dc:description> <dc:source>Sesiune națională cu participare internațională de comunicări științifice studențești, (Volumul I) 126-128</dc:source> <dc:title><p>Metode de securitate a platilor electronice</p></dc:title> <dc:type>info:eu-repo/semantics/article</dc:type> </oai_dc:dc>