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and, accordingly, currents in pipelines, called geomagnetically induced currents (GIT). Pipelines in Yakutia, for example, the pipeline Eastern Siberia-Pacific ...

E3S Web of Conferences 20, 01006 (2017) Solar-Terrestrial Relations and Physics of Earthquake Precursors

DOI: 10.1051/e3sconf/20172001006

Effect of the electromagnetic environment in pipes in Yakutia Vladimir I. Kozlov1,2,*, Larisa M. Abzaletdinova1 , Lena D. Tarabukina1,2 , Alexey A. Korsakov1 and Yuri M. Grigoryev2 1

Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy SB RAS, 677000, Yakutsk, Russia M.K. Ammosov North-Eastern Federal University, 677000, Yakutsk, Russia

2

Abstract. The results of measurements of telluric currents flowing through pipelines laid in the cryolithozone in Yakutia are presented during geomagnetic storms and lightning discharges occurring in the 10 km zone around the pipeline. The currents reach tens of amperes. Construction of a lightning density distribution map. The effect of a direct current flowing in a 150 m long pipeline with a diameter of 110 mm laid in permafrost on the change in the pipe-to-ground potential is measured. Based on the analysis of variations in the horizontal component of the magnetic activity in the current 24th cycle of solar activity, it is established that the frequency of occurrence of a certain level of the rate of change in geomagnetic activity can be expressed by a power law with an order of magnitude of about two at low values. The exponent decreases to unity as the geomagnetic activity increases. The probability of occurrence of time intervals with given threshold values of the rate of change of geomagnetic activity is determined.

1 Introduction Ge oma gne t i cfie l dfluc t ua t i onsa ndc ha r g e d( t hunde r s t or m)c l oudsc r e a t ee l e c t r i cfie l ds a nd,a c c or di ngl y ,c ur r e nt si npi pe l i ne s ,c a l l e dg e oma gne t i c a l l yi nduc e dc ur r e nt s( GI T) . Pi pe l i ne si nYa kut i a ,f ore x a mpl e ,t hepi pe l i neEa s t e r nSi be r i a Pa c i ficOc e a n( ESPO) ,l a ya t ad e pt ho f2m.I nt het r a ns i t i ona ls e c t i onswi t hd i ffe r e ntc ondu c t i vi t y ,t he r ei sadi ffe r e nc e i ne l e c t r i c a lp ot e n t i a l sbe t we e nt hepi pe l i nea ndt hee a r t h,a nde l e c t r oc he mi c a lc or r os i on i nc r e a s e s .Thee nt r ypo i ntofwa nde r i ngc ur r e nt swi l ls e r v ea sac a t hode ,a ndt hepoi n tof flo w ofc ur r e nt swi l ls e r v ea sa na node .Loc a lc or r os i onofunde r gr oundpi pe l i ne sof t e n ma ni f e s t si t s e l fi nt hef or m oful c e r spe ne t r a t i n gde e pi n t ot h eme t a l .St u di e sont he de t e r mi n a t i o no fGI Tgi v ev a l ue su pt ot e nsofa mpe r e s[ 1]a ndhundr e ds[ 2] .Thei nduc e d c ur r e nti nt hema i nobj e c t sc a nc a us es i gni fic a ntfluc t ua t i onsi nt hepot e nt i a l soft he pi pe l i ne gr ound( PPG) .Cha ng e si nPPGc a nr e a c hupt o1V[ 3] .Be c a us eoft hec ha ng ei n t hepo t e nt i a l" pi pe l i ne gr ound"a s s oc i a t e dwi t ht e l l ur i cc ur r e nt s ,t hef ol l o wi ngpr obl e ms a r i s e .Pos i t i v ev a l ue sofPPG l e a dt oc or r os i on.Fl uc t ua t i onsofPPG mor et ha n0. 85V * e-mail: [email protected]

© The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).

E3S Web of Conferences 20, 01006 (2017) Solar-Terrestrial Relations and Physics of Earthquake Precursors

DOI: 10.1051/e3sconf/20172001006

r e l a t i v et ot hena t ur a lpot e nt i a loft heme t a l gr ound ( 0. 66 V)c a nl e a dt oi nc r e a s e d c or r os i o n,e v e nt a ki n gi nt oa c c ountt hepot e nt i a lo fpr ot e c t i o n0. 25V.Fl uc t ua t i onsofPPG upt o1. 2V c a nc a us et hepr oduc t i onofh ydr og e na tt hebounda r ybe t we e nt heme t a la nd t h ec oa t i n g,wh i c hwi l ll e a dt oavi o l a t i onoft hebondbe t we e nt hec oa t i nga ndt heme t a l . Pos s i b l eda ma g et oe l e c t r oni ce q ui pme ntc onne c t e dt ot hep i pe l i ne[ 4] .

2 Methods of investigation Ane xpe r i me nt a ls t udyoft hei nflue nc eoft hema gni t udeoft hedi r e c tc ur r e ntflo wi ng t h r oug ht h ep i p e l i neont hec ha ng ei nt hepot e nt i a ldi ffe r e nc ebe t we e nt hep i pe l i nea ndt he gr oundwa sc a r r i e doutonapa r toft hebur i e dpi pe l i newi t ht hef ol l o wi ngpa r a me t e r s : l e ngt h150m,di a me t e r110mm,t hi c kne s s11mm.Thi ss e c t i onoft heg a sp i pe l i nebe t we e n Ya kut s ka ndTa b a g ac r os s e st hebu l kgr a v e lr oa d,c r e a t i ngahe t e r og e ne i t yi nt hegr ound a r oundt hepi pe l i ne .I twa sobt a i ne d( Fi g.1)t ha tt hepot e nt i a ldi ffe r e nc e" p i pe l i ne gr ound" ( ΔUpgr )de pe nd i ngont hec ur r e nti nt hep i pe l i ne( I p)i se xpr e s s e da sΔUpgr=0. 46*I p0. 005,a tR²=0. 9998.I nourme a s ur e me nt s ,i nt hea bs e nc eofc ur r e nti nt hep i pe l i ne s e gme ntunde rt e s t ,t hepot e nt i a li se q ua lt oUpgr=0. 33V.Fort heope r a t i ngpi pe l i newi t h aq ui e tg e oma gn e t i cs i t ua t i on,t heme a s ur e dpot e nt i a lUpgr=0. 260. 33V.Whe nt he c ur r e ntpa s s e st h r oughPi pe l i net he r ewa sadi s pl a c e me ntoft hepot e nt i a li nt hepos i t i v e di r e c t i on,whi c hc a us e si nc r e a s e dc or r os i oni nt hep i pe l i ne .

Figure 1. The experimental values of the potential difference ΔUp-gr "pipeline-ground" as a function of the magnitude of the constant electric field I p of the pipeline.

I twa sf oundi n[ 5]t ha tt hepo t e nt i a l" pi pe l i n e gr ound"i nt hepa r t soft hePung a Vukt y l g a sp i pe l i ne ,whe r ea c c i de nt s of t e n oc c ur r e d,v a r i e df r om 4. 5t o +2. 5 V.Te s t me a s ur e me nt soft hepi pe l i ne gr oundpot e nt i a ls ho we d:i ft hec ur r e nti sz e r o,t hepot e nt i a l wi l la l s obez e r o ,a ndi ft hec ur r e ntr i s e st o5A,t h epot e nt i a lwi l ll i ne a r l yi nc r e a s et o1. 6V. I ft hec ur r e ntgoe si nt heoppos i t edi r e c t i on,t hepot e nt i a lwi l lc ha ng et o0. 5V.The 2

E3S Web of Conferences 20, 01006 (2017) Solar-Terrestrial Relations and Physics of Earthquake Precursors

DOI: 10.1051/e3sconf/20172001006

pot e nt i a ldi ffe r e nc e( ΔUpgr )" pi pe l i ne gr ound"de pe ndi ngont hec ur r e nti nt hepi pe l i nei s e xpr e s s e da sΔUpgr= 0, 23*I p.Theda t ac or r e s pondt oourr e s ul t s ,e x c e ptf ort he s a t ur a t i onoft hepot e nt i a la ndt hes t e e pne s soft hede pe nde nc e ,whi c hi sde t e r mi ne db yt he s t a t eoft hel oc a ls oi l .I nourc a s e ,t hepi pe l i nes ur r oundst hef r oz e ngr ound. I twa ss ho wni n[ 6]t ha tf org e o l ogi c a la u r or a le l e c t r o de s ,a st hec a u s e sofl a r g e hor i z ont a lc ompone nt sofma gne t i cfie l dv a r i a t i ons( H)i na ur or a lr e gi ons ,t heg e ogr a phi c a l nor t he r nc ompone nt( X)i sc l e a r l yl a r g e rt ha nt h ee a s t e r n( Y) ,bu tdX /dta nddY /dta r e a l mo s te q ua l .Th i si si mpor t a ntwhe na s s e s s i ngt her i s ksofoc c ur r e nc eofg e oma gne t i c a l l y i n duc e dc ur r e nt s( GI T)i nt hema i nob j e c t s ,s i nc et h ehor i z ont a lg e oe l e c t r i cfie l dc a nha v e l a r g ev a l ue si na n ydi r e c t i on,a ndnotonl ypa r a l l e lt ot hee l e c t r ode .Ani mpor t a ntpa r a me t e r f ort hei n v e s t i g a t i onoft hea ppe a r a nc eofGI Ti st hepr oba bi l i t yofoc c ur r e nc eofl a r g e v a l ue soft het i mede r i v a t i v eoft hehor i z ont a lc ompone ntoft heg e oma gne t i cfie l ddB/dt . Th ev a l u eo fd B/dT)us e dt oe s t i ma t eGI Tv a l u e sha sahi ghpo s i t i v ec or r e l a t i onwi t ht he numbe rofs uns po t s( 0. 86)a nda a i nde x( 0. 8998) .92. 665% oft heobt a i ne dg e oma gne t i c a c t i vi t yc a nbee xpl a i ne db yt hej oi n ta c t i onoft hei ndi c e soft henumbe rofs uns pot sa nd a a i nde x[ 7] . 3 Results and discussion Me a s ur e me nt sofe l e c t r i cc ur r e nt si nduc e di nt hebr a nc he soft heTa s Yur y a khMi r n yoi l pi pe l i newi t hadi a me t e rof0. 5m dur i nggr ound ba s e dl i ght ni ngd i s c ha r g e si nt he110km s t r i pf r om t hepi pe l i newe r eme a s ur e d.Thes a meme a s ur e me nt swe r et a k e na tt hebr a nc hof ag a sp i pe l i ne11 0mm i ndi a me t e ra nda bout20km l ongt ot hevi l l a g eofTa ba g af r om t he ma i ng a spi pe l i ne" Sr e dne vi l yui s k o y eg a sfie l d-Ma s t a khBe r g e Ya kut s k" . Toobs e r v et hee l e c t r oma gne t i cfie l do s c i l l a t i onse mi t t e db yi ndu c e dc ur r e nt si nt he pi pe l i ne ,t hr e ehor i z ont a lma gne t i cl oopa nt e nna swe r eus e d,l o c a t e da tdi ffe r e ntd i s t a nc e s f r om t hep i pe l i ne .Tode t e r mi net hel oc a t i onoft het hunde r s t or m ne a rt heobs e r v a t i ons i t e ,a one po i ntpos i t i oni ngs y s t e mf orl i ght n i ngwa si ns t a l l e da tt heI KFI Al oc a t e da tt hepol y gon ne a rYa kut s ka ndt heWol r dWi deLi gh t ni ngLoc a t i o nNe t wor k( WWLLN)s y s t e m[ 8] ,one ofwhos es t a t i onsi sl oc a t e di nYa kut s k[ 9] .I ti sobt a i ne dt ha tt het hunde r s t or mf r ontmo v e s 1 2 wi t ha na v e r a g ev e l oc i t yof44km h a ndha sa na v e r a g ea r e aof500010000km [ 10] .I t f ol l o wst ha ti nt hes ubpol a rl a t i t ude s ,l i ght ni ngs t r i k e sofonet hunde r s t or m oc c urwi t hi na r a di usof10k ma r oundt hepi pe l i nef or12hour s ,e v e ndur i ngat hunde r s t or m mo vi ng a c r os st hepi pe l i ne . Fr om t hec ur r e ntflo wi ngt hr ought heTa s Yur y a khMi r n ypi pe l i nedur i ngl i ght ni ng di s c ha r g e s ,t hei n duc e ds i gna li nt hel oopa nt e nnal oc a t e da tad i s t a nc eof3. 5m f r om t he pi pewa s63t i me sgr e a t e rt ha nt hec ur r e nts i gna li nduc e di nt hel oopa nt e nnal oc a t e da ta di s t a nc e150m.Thedi s t a nc et ot hel i gh t ni ngdi s c ha r g ewa se s t i ma t e df r om t het i me di ffe r e nc ebe t we e nt het i meoft hel i ght ni ngfla s ha ndt hes oundoft hunde r .At hunde r s t or m c r os s e dt hepi pe l i nea tad i s t a nc eof510km f r om t heobs e r v a t i onpoi nta c c or di ngt ot he da t aoft het hunde r s t or ms e e k e r s . Si mi l a robs e r v a t i onswe r ema deonag a spi pe l i ne30km f r om Ya kut s kwhe nt he t hunde r s t or m wa s310k mf r om t hepl a c eofo bs e r v a t i ona ndc r os s e dt hebr a nc hoft he pi pe l i net ot hevi l l a g eTa ba g a .I nt he s eme a s ur e me nt s ,i twa sf oundt ha tdur i ngane a r -

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E3S Web of Conferences 20, 01006 (2017) Solar-Terrestrial Relations and Physics of Earthquake Precursors

DOI: 10.1051/e3sconf/20172001006

t hunde r s t or m, t he ma gni t ude of t he s i gna l of t he ma gne t i cc ompone nt of t he e l e c t r o ma gne t i cfie l dme a s ur e di nt hei mme di a t evi c i ni t yoft hepi pe l i newa s190t i me s gr e a t e rt ha nt hema gni t udeoft hes i gna li nduc e di nt hel oopa nt e nnal oc a t e d400mf r om t he pi pe .Ca l c ul a t e dc ur r e nt si nt hepi pe l i nei nduc e db ygr oundba s e dl i ght n i ngs t r i k ea ta di s t a nc eof37kmf r omt heobs e r v a t i ons i t er e a c he d10A. Thea v e r a g ea nnua lnumbe rofl i gh t ni ngdi s c ha r g e si nYa kut i ai n20092016i ss ho wni n Fi g.2.Thede ns i t yofd i s c ha r g e si sc or r e c t e df ort hel i ght ni ngdi s c ha r g ede t e c t i one ffic i e nc y oft heWWLLN s y s t e m,whi c hi s1115% a nda bout30% f orl i ght ni ngdi s c ha r g e swi t ha c ur r e ntofmor et ha n100kA[ 11] .De ns i t ywa sc a l c ul a t e df ort hes umme rs e a s ons( J une1Augus t31) i n 20092016,whe nt hunde r s t or ms a r ea c t i v ei nt he t e r r i t or y unde r c ons i de r a t i on. Me a s ur e me nt soft hec ur r e nt si nt h ep i pe l i nedur i ngg e oma gne t i cs t or mswe r e c a r r i e doutonabr a nc ht o.Ta ba g af r om t hema i ng a spi pe l i ne" Sr e dne vi l yui s k o y eg a sfie l dMa s t a hBe r g e Ya kut s k"a ndbr a nc he sbe t we e nd i s t r i but i ons t a t i onsNo.2ofYa kut s ka nd Pa v l o v s k ,ap i p e l i ne0. 5 3m i ndi a me t e rf r om t heg a sd i s t r i but i o ns t a t i onNo.2ofYa kut s k c ome su nde rt h egr oun dt ot hevi l l a g eofHa t a s s ya ndf ur t he r .Adoubl eg a sp i pe l i nei sl a i d unde rt her i v e r b e doft heLe naRi v e r ,ont heoppos i t es i deoft her i v e rt he r ei sag a s di s t r i b u t i o ns t a t i o ni nt hevi l l a g eofPa v l o v s k.

Figure 2. The average annual number of lightning discharges in Yakutia in 2009-2016.

To me a s ur et hei nduc e dc ur r e nt sflo wi ng i nt heg a spi pe l i nedur i ng g e oma gne t i c di s t ur ba nc e s ,t woma gne t ome t e r swe r eus e d.On es e ns orwa si ns t a l l e dne xtt ot hepi pe l i ne ( 1mdi s t a nc e ) ,t hes e c onds e ns or( us e df orc omp a r i s on)wa si ns t a l l e da tadi s t a nc eof600m f r om t he p i pe l i ne .The i nduc e dc ur r e ntwa sde t e r mi ne df r om t he di ffe r e nc ei nt he ma gni t ude soft hema gne t i cdi s t ur ba nc e sme a s ur e da tt wos e ns or s ,pr o xi ma la ndf a rf r om t h ep i p e l i n e ,t a ki ngi n t oa c c ountt hec a l i br a t i on .Te s tme a s ur e me nt st oa s s e s st hes e ns i t i vi t y oft hema gne t i cs e ns orwe r ec a r r i e doutus i ngac ur r e ntpa s s i ngt hr ought hewi r e ,whi c hwa s l oc a t e da tadi s t a nc eof1m f r om t hes e ns or .Dur i ngac a l mg e oma gne t i cs i t ua t i on,t he ma gne t ome t e r sp l a c e dont hepi pe l i nea nda tadi s t a nc eof600m f r om t hepi pe l i nes ho we d

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E3S Web of Conferences 20, 01006 (2017) Solar-Terrestrial Relations and Physics of Earthquake Precursors

DOI: 10.1051/e3sconf/20172001006

as i mi l a rnoi s ep a t t e r n.Thi si ndi c a t e st ha tt he r ea r enoi nduc e dq ua s i pe r ma ne ntc ur r e nt si n t hepi pe l i nedur i ngs ma l lpe r t ur ba t i onsoft heg e oma gne t i cfie l d. Cur r e ntme a s ur e me nt si nt hepi pe l i newe r ema dedur i ngt hr e epo we r f ulg e oma gne t i c s t or ms .Dur i ngama gne t i cs t or m onJ a nua r y21,2005,t hec ur r e nti nt hepi pe l i ne0. 11i n di a me t e rr e a c he dv a l ue sofupt o3A.Dur i ngt h es t or m onMa y28,2011,t hec ur r e nti nt he pi pe l i newi t had i a me t e rof0. 53m r e a c he dv a l ue sofupt o0. 5A.Dur i ngt hes t or m Augus t 27,2 013 ,t h ec ur r e nti nt hepi pe l i newi t had i a me t e rof0. 53m r e a c he dv a l ue sofupt o0 . 3 A.Ani n v e s t i g a t i onoft heme a s ur e dc ur r e ntflo wi ngt hr ought hepi pe l i nedur i ngs t r ong g e oma gne t i cs t or mss ho we dt ha tt hec ur r e ntr e a c he st e nsofa mpe r e sa ndl a s t sf r om s e v e r a l hour st os e v e r a lda y s . Theme t hodofe xpe r i me nt a li n v e s t i g a t i onoft hee ffe c tofg e oma gne t i cdi s t ur ba nc e son e xt e nde dt r unkob j e c t sc a nber e duc e dt ot hei de nt i fic a t i onoft i mepe r i odsi nwhi c ht he v a l ueoft her a t eofi nc r e a s eoft hema gne t i cfie l d( dB/d t )a bo v et het hr e s hol dl e v e l s : >5n T /mi n( a c t i v efie l d) ,c or r os i oni nc r e a s e ss ha r pl yi nt hea bs e nc eofa ddi t i ona lpr ot e c t i on;> 20n T/mi n( s t o r m) ,c or r os i oni nc r e a s e sdr a ma t i c a l l ye v e nwi t hpr ot e c t i on;>30n T/mi n ( e xt r e mes t or m)e ffe c t sone ne r gys y s t e ms[ 12] . I twa ss ho wni n[ 13]t ha tac l os e rf unc t i ona lc onne c t i oni sobs e r v e dbe t we e nt heHI T a ndt hema gni t udeoft hema gne t i cfie l di nc r e a s er a t e( dB /d t )t ha nwi t ht hehor i z ont a l c ompone ntoft heg e oma gne t i cfie l dH.Agoodc or r e l a t i onoft hedX/dtv a r i a t i onswi t ht he i nduc e dc ur r e nt si nt het r a ns mi s s i onl i nedi r e c t e da l ongt heXi ss ho wni n[ 14] . I ti spr opos e di n[ 7]t ous et hepubl i s he dda t aoft heI nt e r na t i ona lRe a l t i meMa gne t i c Obs e r v a t or yNe t wor ka st hema gni t udeoft hema gne t i cfie l di nc r e a s er a t e( dB /dt ) . The r e f or e ,t hes t udyofv a r i a t i onsi ng e oma gne t i ca c t i vi t yi sc a r r i e doutu s i ngt heda t aoft he r a t eofi nc r e a s ei nt hes t r e ngt hoft hehor i z ont a lc ompone nt( dB /dt )oft heYa kut s k Obs e r v a t or yoft hei nt e r r e gi ona lda t ac ol l e c t i onnodef ors e r vi c i ngt heRus s i a nUkr a i ni a n s e gme ntoft hewor l dne t wor koft heI NTERMAGNETg e oma gne t i cob s e r v a t or i e s .I nt he ba s eI NTERMAGNETda t a( Ra t eofCha nc hd B/dt )oft heYa kut s kObs e r v a t or y( Ya kut s k, YAK, 61. 96 / 129. 66) a r e pr e s e nt e d wi t h a mi nut e r e s ol ut i on ( ht t p: / / www. i nt e r ma gne t . or g/ da t a donne e / da t a pl ot e ng. php? t ype =xyz ) . Cons i de rt h epr oba bi l i t yofe x c e e di ngac e r t a i nl e v e ld B/dtb yt hee x a mpl eofav e r y s t r ongma gne t i cs t or m Augus t05,2011.Fr om 17t o20hour s ,t hedi s t ur ba nc el e v e lr e a c he d G4,a ndf r om 20t o23hour s-G3.Augus t06f r om 02t o05hour s-G1.f r om 23t o02hour s -G2,f r om 02t o05hour s-G1.Andt he nunt i l08: 00onAugus t07,2011t hes t or m i n t e ns i t ygr a dua l l yde c r e a s e d.Fort hee nt i r eda yAugus t05,2011t i mei nt e r v a l swi t ht he r a t eofc ha ng eo ft hema gne t i cfie l d>5n Twe r e7. 15%,>20n T1. 18%,>3 0n T0. 42% b< 5n T6. 6%,20n T/mi n40t i me s .Ex c e e di ngt hel e v e l soft her a t eof i nc r e a s eoft hema gne t i cfie l di nt e ns i t yi n20142016we r eobs e r v e d:>5n T/mi n118 s t or ms ,>10n T/mi n86s t or ms ,>20n T/mi n41s t or msa nd>30n T/mi n25s t or ms .The ma xi muma mountofma gne t i cdi s t ur ba nc ei sobs e r v e di ns pr i nga nda ut umn. Di ffe r e nt i a ldi s t r i but i onoft heoc c ur r e nc eofpe r t ur ba t i onsf ors t or ms20142016.I sa t ht hev a l ueoft he po we rl a wa ndc a nbee xpr e s s e db yt hef or mul ay= 33, 6x-1,1,wi de t e r mi na ntR²=0, 72.Thema xi mumobs e r v e dd i s t ur ba nc ei s163n T/mi n. Thec ha r a c t e r i s t i ci nd i vi dua ldi ffe r e nt i a ldi s t r i but i onoft heoc c ur r e nc eoft hev a r i a t i on i nt her a t eofc ha ng eoft hema gne t i cfie l ddB/d t ,n T/mi nunde rt hema gne t i cs t or m G4on J une22,2015,i se xpr e s s e db yapo we rl a w.I nt her a ng eofv a l ue sf r om 1t o1020n T/mi n, t hedi s t r i but i onha sas t e e pe rs l ope ,e xpr e s s e db yt hef or mul ay=781x-1.7,a tR²=0. 92, c ompa r e dt ot hei nt e r v a lf r om 10t o100n T/mi n,whe r et hedi s t r i but i onha smor eSl opi ng 0 . 9 4 s l ope ,e xpr e s s e db yt hef or mul ay=76x ,wi t hR²=0. 73. The14t hma gne t i cs t or msf or2015a ndJ a nua r y2016( t hema xi mum g e oma gne t i c a c t i v i t yi nt h e24 t hc y c l eofs ol a ra c t i vi t y)we r ec hos e nt os ho wt hema xi mum v a l ue soft he c ha ng ei ndB/dtf or20142016.Thev a l ueoft hee xpone ntofas i ngl epo we rl a wf ore v e nt s wi t hama xi mu mv a r i a t i oni nt her a t eofc ha ng eoft hema gne t i cfie l ddB/dtf r om 6n T/ mi nt o100n T/mi nv a r i e sf r om3. 1t o2. 5,a ndf ore v e nt soft hema xi mumr a ng ef r om 100 n T/mi nUpt o1 63n T/mi nt hev a l ueoft hei ndi c a t orv a r i e sf r om 2. 2t o1. 2.Th a ti s ,a s

6

E3S Web of Conferences 20, 01006 (2017) Solar-Terrestrial Relations and Physics of Earthquake Precursors

DOI: 10.1051/e3sconf/20172001006

t hev a l ueofd B/dti nc r e a s e s ,t hev a l ueoft hei ndi c a t orde c r e a s e si na bs ol ut ev a l ue ,a nd t he r e f or et hedi s t r i but i oni sbe i nga dj us t e d. Forma gne t i cs t or ms ,t hepr oba bi l i t yofe x c e e di ngt het hr e s hol dl e v e l soft her a t eof i nc r e a s eoft hema gne t i cdi s t ur ba nc ewa sob t a i ne da tt hema xi mum oft heg e oma gne t i c a c t i vi t yoft he24t hs ol a rc y c l e :37% f or>5n T/mi n,8. 3% f or>20n T/mi n,4. 6% f or>30 n T/Mi n. Thedi s t r i but i onoft hedi r e c t i ona l i t yoft hev a r i a t i onsdB /d tha sac ha ot i cc ha r a c t e r wi t hou tpr onounc e dd i r e c t i vi t y ,i nc ont r a s tt ot hev a r i a t i onoft hehor i z ont a lc ompone ntof t hema gne t i cfie l dH,whi c hha sapr onounc e dd i r e c t i ona l i t y . I nt he24t hc y c l e ,t hema xi mum g e oma gne t i ca c t i vi t ywa sobs e r v e di n2015a ndi n2016 ont hede c l i ni ngbr a nc hofs ol a ra c t i vi t y .Ac c or di ngt o[ 15] ,t he24t hs ol a rc y c l ei st he be gi nni ngofa ne poc hof" l o we r e d"s o l a ra c t i vi t y .I ti sa s s ume d[ 16]t ha tt hee poc hof " r e duc e d"s ol a ra c t i vi t ywi l ll a s t5s ol a rc y c l e s .I ti se xpe c t e dt ha tt he s es ol a rc y c l e swi l lbe ofl o wa ndme di u ma c t i vi t y .I ti sa s s ume di n[ 15]t ha ti nt h i se r as ol a rfla r e sc a nnot s i gn i fic a n t l ye x c e e dt hepo we r f ulfla r e sa l r e a dyo b s e r v e ddur i ngi ns t r ume nt a lobs e r v a t i ons . Thi sma k e si tp os s i bl et oa s s umet ha tt hec onc l us i onsdr a wnf r om oura na l y s i soft he ma gni t ude soft hev a r i a t i onsofma gne t i ca c t i vi t yf r om 2008t o2016c a nbea ppl i e dt oa f ut u r ef or t y y e a ri nt e r v a l . 4 Conclusions Dur i ngs t r ongg e oma gne t i cs t or msa nddur i ngat hunde r s t or ma tadi s t a nc eof10km a r oundt hepi pe l i ne ,g e oma gne t i ci nduc e dc ur r e nt sa ppe a ri ni t ,r e a c hi ngt e nsore v e n hundr e dsofa mpe r e s .Asar e s ul t ,t hepot e nt i a loft hes oi l pi pe l i nei nc r e a s e sa ndt he c or r os i onoft hepi pe l i nei spos s i bl yi nc r e a s e d. Ther e s e a r c hi spa r t i a l l yf unde db yRFBR No.154505005r _v os t ok_aa ndac ompr e he ns i v e r e s e a r c hpr ogr a mi nt heRe publ i cofSa kha( Ya kut i a ) .

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E3S Web of Conferences 20, 01006 (2017) Solar-Terrestrial Relations and Physics of Earthquake Precursors

DOI: 10.1051/e3sconf/20172001006

[6] A. Viljanen, Geophysical Research Letters, 24:6, 631–634 (1997) [7] E.O. Falayi, A.B. Rabiu, Frontiers in Science, 2:1, 1-5 (2012) [8] R. L. Dowden, J. B. Brundell, C. J. Rodger, J. Atmos. Solar-Terr. Phys., 64:7, 817-879 (2002) [9] L. D. Tarabukina, V. I. Kozlov, R. R. Karimov, V. A. Mullayarov, Proc. SPIE 9680, 96805S (2015) [10] V. I. Kozlov, V. A. Mullayarov, A. E. Vasilyev, Russian Meteorology and Hydrology, 3, 27-31 (2003) [11] S. F. Abarca, K. L. Corbosiero, T. J. Galarneau Jr., J. Geophys. Res. 115, D18206 (2010) [12] J. Koen, C.T. Gaunt, Geomagnetically induced currents at mid-latitudes. URSI, Maastricht, (2002) [13] A. Viljanen, Geophysical research letters, 24:6, 631-634 (1997) [14] V. A. Pilipenko et al., Trudy Kol'skogo nauchnogo tsentra RAN, 4-2, 38 (2016) [15] V. N. Ishkov, Vestnik ONZ RAN, 8, NZ5001 (2016) (in Russian) [16] V. N. Ishkov, Sb. «Solnechnaya i solnechno-zemnaya fizika–2013», 111-114 (2013)

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