Ukuqonda Insimu Kamagnetic Yomhlaba
Isingeniso
Insimu yamagnetic yoMhlaba, evame ukubizwa ngokuthi insimu yamagnetic, iyisimanga esiyinkimbinkimbi nesithakazelisayo. Imboza iplanethi yethu, isuka ngaphakathi iye emkhathini, ithinta kakhulu impilo eMhlabeni. Lesi sivikelo esivikelayo sivikela umoya welanga owakhiwe yizinhlayiya ezishajiwe futhi senza kube lula ukuhamba ngekhampasi. Ukubaluleka kwensimu yamagnetic kuyanda nakakhulu, kuthonya izinqubo zemvelo ezahlukahlukene kanye nezinhlelo zobuchwepheshe. Lesi sihloko sihlola ubunzima bensimu yamagnetic yoMhlaba, sihlola imvelaphi yayo, izici zayo, ukubaluleka kwayo, kanye nokuthembela kwayo kubantu banamuhla.
Imvelaphi Yensimu Kamagnetic Yomhlaba
Insimu yamagnetic yomhlaba ikhiqizwa ngokuyinhloko ngaphakathi kwenhliziyo yeplanethi. Inhliziyo, eyakhiwa kakhulu yinsimbi ne-nickel, inomgogodla oqinile wangaphakathi kanye nenhliziyo yangaphandle encibilikisiwe. Insimu yamagnetic ye-geomagnetic iqala ngenqubo efana nendlela ye-dynamo ezisekelayo: ukunyakaza kwenhliziyo yangaphandle ewuketshezi kukhiqiza imisinga kagesi, eveza insimu yamagnetic.
Ithiyori evelele echaza lesi simo ithiyori ye-geodynamo. Njengoba uMhlaba ujikeleza, udala ukunyakaza okuyinkimbinkimbi ngaphakathi kwensimbi encibilikisiwe kanye ne-nickel. Lokhu kunyakaza, kuhlangene nomphumela we-Coriolis—ovela ekujikelezeni koMhlaba—kukhiqiza ukugeleza kwe-helical okukhiqiza imisinga kagesi. Ngemva kwalokho, le misinga ibangela insimu yamagnetic, okubonisa uhlobo oluhlangene lokunyakaza koketshezi kanye ne-electromagnetism ngaphakathi kwenhliziyo.
Izici Zensimu Kamagnetic Yomhlaba
Insimu yamagnetic yomhlaba inamandla, ichazwa yinsimu yayo ye-vector, okusho ukuthi inobukhulu kanye nesiqondiso kunoma yiliphi iphuzu elithile. Insimu ifana cishe nemodeli ye-dipole ene-pole yamagnetic esenyakatho neseningizimu, lapho imigqa yensimu ivela khona kwelinye i-pole bese ihlangana kwelinye. Kodwa-ke, le ncazelo ye-dipole iyindlela elula: insimu yangempela ibonisa ubunzima obukhulu, enezingxenye eziningi kanye nokungalingani.
Insimu yamagnetic ilinganiswa kusetshenziswa amayunithi abizwa ngokuthi i-teslas (T) noma i-gauss (G), kanti i-tesla eyodwa ilingana ne-gauss eziyi-10,000. Ngokuvamile, amandla ensimu yamagnetic ebusweni boMhlaba asukela kuma-microtesla angu-25 kuya kwangu-65 (0.25 kuya ku-0.65 gauss).
Ngaphezu kwalokho, insimu yamagnetic idlula ekushintsheni okuqhubekayo kanye nezinguquko kancane kancane, okubizwa ngokuthi ukuhlukahluka kwezwe. Lokhu kuhlukahluka kuvela ekunyakazeni koketshezi ngaphakathi kwenhliziyo futhi kungaholela ezimweni ezifana nokujikijela kwe-geomagnetic—izinguquko ezingazelelwe ensimini yamagnetic.
Izigxobo ZikaMagnetic Nokunyakaza Kwazo
Izinsika ezisebenza ngogesi azihambisani kahle nezinsika zezwe futhi ziyaqhubeka nokunyakaza. Izinsika ezisebenza ngogesi ezisenyakatho, okwamanje eziseduze ne-Canadian Arctic, bezilokhu zithuthela eRussia ngesivinini esingamakhilomitha angaba ngu-40 ngonyaka. Lokhu kuhamba kuvela esimweni esiguquguqukayo senqubo ye-geodynamo.
Ukuguqulwa kwepole kungenye isici esithakazelisayo sensimu yamagnetic yoMhlaba. Ngesikhathi se-geological timescales, ama-poles abuyele emuva izikhathi ezingenakubalwa, kanti ukuguqulwa okukhulu kokugcina kwenzeka cishe eminyakeni engu-780,000 eyedlule. Ngesikhathi sokuguqulwa, insimu yamagnetic iba buthaka, iba yinkimbinkimbi kakhulu futhi ingase ibe nama-poles amaningi ngaphambi kokusungula ukucushwa okusha kwe-dipole.
Indima ye-Magnetosphere
I-magnetosphere ezungeze uMhlaba, yakhiwa ngokusebenzisana phakathi kwensimu ye-geomagnetic nomoya welanga. Lesi sifunda sandisa izinkulungwane zamakhilomitha siye emkhathini futhi sisebenza njengebhamuza elivikelayo, lisusa izinhlayiya ezishajelwe elangeni. Ukusebenza kahle kwe-magnetosphere ekuvikeleni iplanethi kubalulekile ekulondolozeni umkhathi woMhlaba nokuvikela impilo emisebeni yelanga kanye nemisebe ye-cosmic.
Ngaphakathi kwe-magnetosphere, kunezakhiwo eziningana ezibalulekile, okuhlanganisa namabhande emisebe kaVan Allen. Lawa mabhande ayizindawo zezinhlayiya zamandla aphezulu ezibanjiwe, ikakhulukazi ama-electron, nama-proton, okuletha izinselele kuma-satellite kanye nosomkhathi.
Esinye isici esibalulekile yi-magnetotail, indawo ende enwetshiwe ohlangothini lobusuku loMhlaba, maqondana nelanga. I-magnetotail idlala indima ebalulekile ezinqubweni ezifana neziphepho ze-geomagnetic kanye ne-auroras—ukukhanya kwemvelo okukhangayo eduze kwezindawo ezibandayo okuvela ezinhlayiyeni ezishajelwe ezisebenzisana nomoya.
Ukubaluleka Ekuphileni Nasemisebenzini Yabantu
Insimu yamagnetic yomhlaba isebenza njengesici esibalulekile empilweni nasemisebenzini yabantu ngezindlela eziningi. Okokuqala, isiza ekuvikeleni ungqimba lwe-ozone ngokuvimbela imisebe yelanga neyendawo yonke eyingozi, ngaleyo ndlela igcine indawo ezinzile ekwazi ukusekela izimiso zemvelo ezahlukahlukene.
Ngaphezu kwalokho, insimu yamagnetic ye-geomagnetic inike amandla okuzulazula phakathi namakhulu eminyaka. Ama-Compass, amathuluzi okuqala okuzulazula, athembele ensimini yamagnetic yoMhlaba ukuze athole isiqondiso sokuqondisa. Muva nje, insimu yamagnetic isiza ezinhlelweni zanamuhla zokuzulazula kanye nezokuxhumana, ezivelele kakhulu ocwaningweni lwezindiza, olwandle, kanye nolwe-geophysical.
Ngaphezu kwalokho, ososayensi basebenzisa insimu yamagnetic lapho befunda i-plate tectonics kanye nokwenza ucwaningo lwe-paleomagnetic. Ukwakheka kwamadwala agcwele i-sedimentary kunomlando wokuqondiswa kwensimu yamagnetic yomlando, okunikeza ukuqonda ngomlando wokukhukhuleka kwezwekazi kanye nomlando we-geological.
Izinselele Nocwaningo Lwesimanje
Ucwaningo lwamanje ngensimu yamagnetic yoMhlaba luhilela ukuqapha izinguquko zayo ngokusebenzisa imisebenzi yesathelayithi, ikakhulukazi i-European Space Agency's (ESA) Swarm constellation. Ukuqonda ukuhlukahluka kwezwe, ukufuduka kwepole, kanye namaphethini angaba khona aholela ekuguqukeni kubaluleke kakhulu.
Ngaphezu kwalokho, ososayensi bahlola imiphumela yesimo sezulu sasemkhathini ensimini yamagnetic, ikakhulukazi begxile ekukhishweni kwe-coronal mass (ama-CME) kanye nokugqashuka kwelanga—izenzakalo ezingaphazamisa i-magnetosphere, amasathelayithi, kanye nezinhlelo zokuxhumana. Ukuthuthukisa amamodeli okubikezela kanye namasu okunciphisa ukuphazamiseka okuhlobene nesimo sezulu sasemkhathini kubalulekile ekuthuthukiseni ukuqina emphakathini wethu oncike kakhulu kwezobuchwepheshe.
Isiphetho
Insimu yamagnetic yomhlaba ingamandla ayinkimbinkimbi, abalulekile, futhi aguquguqukayo, avikela iplanethi, asiza ukuzulazula, futhi athonya ububanzi bezinhlelo zemvelo nezenziwe ngabantu. Ukuqonda izakhiwo, ukuziphatha, kanye nemiphumela yensimu yamagnetic kungumshikashika wesayensi obalulekile. Ucwaningo oluqhubekayo kanye namathuluzi obuchwepheshe athuthukile athembisa ukuveza izimfihlakalo ezengeziwe ezizungeze lesi sici esifihliwe kodwa esibaluleke kakhulu seplanethi yethu, ukuqinisekisa ukuthi sihlala siqaphela futhi silungele noma yiziphi izenzakalo zamagnetic ezingase zivele. Njengoba ukuqonda kwethu kujula, nekhono lethu lokuvumelana nokuvikela izinqubo zamaplanethi ezisekela ukuphila eMhlabeni liyakhula.
