Natural and technogenic components of megalopolis magnetic field

Abstract

Presented by the Editorial Board Member V. I. StarostenkoÂïëèâ ìàãí³òíèõ áóð íà ëþäèíó ñòຠîñòàíí³ì ÷àñîì âñå ö³êàâ³øèì. Ó ñòàòò³ âèêëàäåíî ðåçóëüòàòè äîñë³äaeåíü çì³ííîãî ìàãí³òíîãî ïîëÿ òåõíîãåííîãî ïîõîäaeåííÿ â ð³çíèõ ðà-éîíàõ ìåãàïîë³ñó ³ ï³äçåìíîìó òðàíñïîðò³ íà ïðèêëàä³ ì. Êè¿â. Âèì³ðè ïðîâåäåí³ â ïÿòè ïóíêòàõ ó ð³çíèõ ðàéîíàõ ì³ñòà, à òàêîae ó ìåòðî â îáîõ íàïðÿìêàõ ðóõó ïî¿çäà. Îòðèìàíà ³íôîðìàö³ÿ ïîêàçóº çàãàëüíó ñèòóàö³þ ç ìàãí³òíèì øóìîì ó ãóñòîíàñåëåíèõ ì³ñòàõ. ßê áþäaeåòíèé âàð³àíò äëÿ âèì³ðþâàíü â ìåòðî âèêîðèñòàíèé ñìàðòôîí ç âáóäîâàíèì ìàãí³-òîìåòðîì.Êëþ÷îâ³ ñëîâà: ïðèðîäíå ãåîìàãí³òíå ïîëå, òåõíîãåííå ìàãí³òíå ïîëå, ìàãí³òíèé øóì.Introduction. At the present time there are a lot of data about the influence of constant and wide frequency range magnetic field variations on live organisms and human activity [Travkin, 1971;ICNIRP ..., 1998;Pavlovich et al., 1991;Orlyuk, 2001; Physicical ..., 2003;Khramov et al., 2006;Serpov, 2007; Standart ..., 2008;Belokrinitskiy, 2009;Kulikov, Timofeeva, 2011;Medvedeva et al., 2011;Rozov et al., 2013; Gvishiani et al., 2013 and others]. In large megalopolises natural Earth's magnetic field is mostly complemented by technogenic component from different sources of constant and variable kind [Orlyuk, Romenets, 2004;Tyagunov, 2011;Romenets, Orliuk, 2013;Orlyuk et al., 2014]. In the minimal health norm of static magnetic field is a half of its background values in the residence territory [Physical ..., 2003]. The authors [Orlyuk, Romenets, 2005] suggested the value of its "ecological norm" nearby 35-55 μT. This article presents calculated and experimental data about Kiev and its surrounding area magnetic field of natural and technogenic origin. 1. Natural Earth's magnetic field. Spatiotemporal structure of the Earth's magnetic field induction B is the sum of fields from different sources: B = n B + ΔB + δB , where n B -normal (main) field of the Earth, generated by the liquid core processes; ΔB -anomalous magnetic field (the lithosphere field), mainly caused by rocks magnetization, δB -external field generated by solar and cosmic radiation actions, the Sun and near-Earth space magnetic fields. Quasi-permanent geomagnetic field, which is the sum of main and lithosphere magnetic fields, sets the geomagnetic background where biosphere processes run and human lives. Afterwards, map of the magnetic induction module B for Kiev region was developed.Natural geomagnetic field varies within 50 100-50 860 nT, increasing from southwest to northeast (Fig. 1).Local spatial geomagnetic field inhomogeneity is mainly determined by its lithospheric component that varies within city from -200 to 500 nT.The right riverside of the city (especially the old town) is mainly located in positive magnetic field areas with an intensity of 50-100 nT. The left riverside of the city is located in predominantly negative magnetic field areas (up to -200 nT). On the left riverside only Rusanivka, Bereznyaky and partly Kharkivskyi, Bortnychi areas are characterized by low positive background near 50...