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U Vikipediyi ye statti pro inshi znachennya cogo termina Ganimed znachennya Ganimed Zobrazhennya Ganimeda zroblene KA Yunona 2021 roku Svitli poverhni slidi nedavnih udarnih zitknen poverhni pokriti boroznami i bila pivnichna polyarna shapka u verhnomu pravomu kuti zobrazhennya bagati vodyanim lodom Dani pro vidkrittyaData vidkrittya 7 sichnya 1610 rokuVidkrivach i Galileo GalilejPlaneta YupiterNomerOrbitalni harakteristikiVelika pivvis 1 070 400 kmPericentr 1 069 200 kmApocentr 1 071 600 kmOrbitalnij period 7 15455296 dibEkscentrisitet orbiti 0 0013Nahil orbiti 0 20 do ploshini ekvatora planetiFizichni harakteristikiVidima zoryana velichina vidima zoryana velichina Serednij radius 2634 1 0 3 kmPlosha poverhni 8 7 107 km Ob yem 7 6 1010 km Masa 1 4819 1023 kgGustina 1 936 g sm Priskorennya vilnogo padinnya 1 428 m s Druga kosmichna shvidkist 2 741 km sAtmosferaInshi poznachennyaGanimed u VikishovishiGanime d najbilshij suputnik Yupitera sho nalezhit do grupi galileyevih suputnikiv Odnochasno ye najbilshim suputnikom u Sonyachnij sistemi Jogo diametr dorivnyuye 5268 km sho na 2 bilshe nizh u Titana drugogo za velichinoyu suputnika v Sonyachnij sistemi i na 8 bilshe nizh u Merkuriya Pri comu masa Ganimeda stanovit lishe 45 masi Merkuriya ale sered suputnikiv planet vona ye rekordnoyu Ganimed perevishuye Misyac za masoyu v 2 02 raziv 1 2 Oblitayuchi orbitu priblizno za sim dniv Ganimed bere uchast v orbitalnomu rezonansi 1 2 4 z dvoma inshimi suputnikami Yupitera Yevropoyu ta Io Ganimed skladayetsya z priblizno rivnoyi kilkosti silikatnih porid i vodyanogo lodu Ce povnistyu diferencijovane en tilo z ridkim yadrom bagatim zalizom Jmovirno v jogo nadrah na glibini blizko 200 km mizh sharami lodu ye okean ridkoyi vodi 3 Na poverhni Ganimeda sposterigayetsya dva tipi landshaftu Tretinu poverhni suputnika zajmayut temni oblasti pocyatkovani udarnimi kraterami en Yihnij vik syagaye chotiroh milyardiv rokiv Reshtu ploshi zajmayut molodshi svitli oblasti vkriti boroznami i hrebtami Prichini skladnoyi geologiyi svitlih oblastej zrozumili ne do kincya Jmovirno vona pov yazana z tektonichnoyu aktivnistyu viklikanoyu priplivnim nagrivannyam 4 Ganimed yedinij suputnik v Sonyachnij sistemi sho maye vlasnu magnitosferu Shvidshe za vse yiyi stvoryuye konvekciya v ridkomu yadri bagatomu zalizom 5 Nevelika magnitosfera Ganimeda roztashovuyetsya v mezhah nabagato bilshoyi magnitosferi Yupitera i lishe neznachno deformuye yiyi silovi liniyi U suputnika ye tonka atmosfera do skladu yakoyi vhodyat taki alotropni modifikaciyi kisnyu yak O atomarnij kisen O2 kisen i mozhlivo O3 ozon 6 Kilkist atomarnogo vodnyu H v atmosferi neznachna Chi ye u Ganimeda ionosfera nezrozumilo 7 Ganimed vidkriv Galileo Galilej yakij pobachiv jogo 7 sichnya 1610 roku 8 9 10 Nezabarom Simon Marius pid chas odnogo z druzhnih piknikiv z kolegami 11 zaproponuvav nazvati jogo na chest vinocherpcya Ganimeda 12 Pershim kosmichnim aparatom sho vivchav Ganimed buv Pioner 10 u 1973 roci 13 Nabagato detalnishi doslidzhennya vikonali aparati programi Voyadzher u 1979 roci Kosmichnij aparat Galileo yakij vivchav sistemu Yupitera pochinayuchi z 1995 roku viyaviv pidzemnij okean i magnitne pole Ganimeda U 2012 roci Yevropejske kosmichne agentstvo shvalilo novu misiyu dlya doslidzhen krizhanih suputnikiv Yupitera JUICE yiyi zapusk planuyetsya na 2022 rik a pributtya v sistemu Yupitera na 2030 rik Na 2020 rik zaplanovana misiya Europa Jupiter System Mission Laplace Zmist 1 Vidkrittya 2 Nazva 3 Pohodzhennya ta evolyuciya 4 Orbita i obertannya 5 Fizichni harakteristiki 5 1 Sklad 5 2 Poverhnya 5 3 Vnutrishnya budova 5 4 Atmosfera ta ionosfera 5 5 Magnitosfera 6 Vivchennya 7 Div takozh 8 Posilannya 9 Div takozhVidkrittya red Zazvichaj vidkrittya Ganimeda pripisuyut Galileyevi yakij skeruvav na Yupiter skonstrujovanij vlasnoruch teleskop i sposterigav poblizu ciyeyi planeti chotiri zirki sho postijno zminyuvali svoye roztashuvannya Ci ob yekti i viyavilisya najbilshimi suputnikami Yupitera yaki piznishe nazvali galileyevimi 1614 roku z yavilasya pracya nimeckogo astronoma Simona Mariusa Mundus Jovialis v yakij vin stverdzhuvav sho sposterigav ci ob yekti na kilka dniv ranishe Galileya Sam Galilej cyu pracyu vvazhav plagiatom Nazva red Nazvu suputnika bulo zaproponovano Mariusom prote uhvaleno yiyi bulo lishe u XX stolitti Vona pohodit z greckoyi mifologiyi Yunak Ganimed buv slugoyu vinocherpiyem i kohancem Zevsa Yupitera Pohodzhennya ta evolyuciya red nbsp Porivnyannya rozmiriv Misyacya Ganimeda i Zemli Ganimed jmovirno sformuvavsya z akrecijnogo disku chi gazopilovoyi tumannosti yaka otochuvala Yupiter deyakij chas pislya jogo utvorennya 14 Formuvannya Ganimeda jmovirno zajnyalo blizko 10 000 rokiv 15 na poryadok menshe ocinki dlya Kallisto V tumannosti Yupitera pri formuvanni galileyevih suputnikiv jmovirno bulo vidnosno malo gazu sho mozhe poyasnyuvati duzhe povilne formuvannya Kallisto 14 Ganimed utvorivsya blizhche do Yupitera de tumannist bula shilnishoyu sho i poyasnyuye jogo shvidshe formuvannya 15 Ce v svoyu chergu prizvelo do togo sho teplo yake vidilyalosya pri akreciyi ne vstigalo rozsiyuvatisya Ce mozhlivo viklikalo tanennya lodu i viddilennya vid nogo skelnih porid Kameni osili v centri suputnika formuyuchi yadro Na vidminu vid Ganimeda pri formuvanni Kallisto teplo vstigalo vidvoditisya lodi v yiyi nadrah ne tanuli i diferenciaciyi ne vidbuvalosya 16 Cya gipoteza poyasnyuye chomu dva suputnika Yupitera nastilki rizni nezvazhayuchi na podibnist masi i skladu 16 17 Alternativni teoriyi poyasnyuyut vishu vnutrishnyu temperaturu Ganimeda priplivnim nagrivannyam 18 abo intensivnishoyu diyeyu na nogo piznogo vazhkogo bombarduvannya 19 20 21 Yadro Ganimeda pislya formuvannya zbereglo bilshu chastinu tepla nakopichenogo pid chas akreciyi ta diferenciaciyi Vono povilno viddaye ce teplo krizhanij mantiyi pracyuyuchi yak svoyeridna teplova batareya 16 Mantiya v svoyu chergu perenosit ce teplo na poverhnyu konvekciyeyu 17 Rozpad radioaktivnih elementiv v yadri prodovzhiv jogo rozigrivati viklikayuchi podalshu diferenciaciyu buli sformovani vnutrishnye yadro iz zaliza ta sulfidu zaliza en i silikatna mantiya 16 22 Tak Ganimed stav povnistyu diferencijovanim tilom Dlya porivnyannya radioaktivne nagrivannya nediferencijovanoyi Kallisto viklikav lishe konvekciyu v yiyi krizhanih nadrah sho efektivno yih oholodilo i zapobiglo velikomasshtabnomu tanennyu lodu ta shvidkij diferenciaciyi 23 Proces konvekciyi na Kallisto viklikav lishe chastkove viddilennya kameniv vid lodu 23 Narazi Ganimed prodovzhuye povilno oholodzhuvatisya 22 Teplo sho jde vid yadra ta silikatnoyi mantiyi dozvolyaye isnuvati pidzemnomu okeanu 24 a povilne oholodzhennya ridkogo yadra z Fe i FeS viklikaye konvekciyu i pidtrimuye generaciyu magnitnogo polya 22 Potochnij teplovij potik z nadr Ganimeda jmovirno vishij nizh u Kallisto 16 Orbita i obertannya red nbsp List Galileya do Leonardo Donato sho nachebto opisuye vidkrittya galileyevih suputnikiv viyavivsya pidrobkoyu pochatku XX stolittya 25 Ganimed perebuvaye na vidstani 1 070 400 kilometriv vid Yupitera sho robit jogo tretim za viddalenistyu galileyevim suputnikom 26 Jomu potribno sim dniv i tri godini shob zdijsniti povnij obert navkolo Yupitera Yak i v bilshosti vidomih suputnikiv obertannya Ganimeda sinhronizovane z obertannyam navkolo Yupitera i vin zavzhdi povernutij odniyeyu storonoyu do planeti 27 Jogo orbita maye neveliki nahil do ekvatora Yupitera i ekscentrisitet yaki kvaziperiodichno zminyuyutsya u zv yazku iz vikovimi zburennyami vid Soncya i planet Ekscentrisitet zminyuyetsya v diapazoni 0 0009 0 0022 a nahil v diapazoni 0 05 0 32 28 Ci orbitalni kolivannya zmushuyut nahil osi obertannya kut mizh ciyeyu vissyu i perpendikulyarom do ploshini orbiti zminyuvatisya vid 0 do 0 33 29 nbsp Rezonans Laplasa orbitalnij rezonans suputnikiv Ganimed Yevropa ta IoGanimed perebuvaye v orbitalnomu rezonansi z Yevropoyu ta Io na kozhen obert Ganimeda navkolo planeti pripadaye dva oberti Yevropi i chotiri oberti Io 28 30 Maksimalne zblizhennya Io ta Yevropi vidbuvayetsya koli Io perebuvaye v pericentri a Yevropa v apocentri Z Ganimedom Yevropa zblizhuyetsya perebuvayuchi v svoyemu pericentri 28 Takim chinom vishikovuvannya v odnu liniyu vsih cih troh suputnikiv nemozhlive Takij rezonans nazivayetsya rezonansom Laplasa 31 Suchasnij rezonans Laplasa nezdatnij zbilshiti ekscentrisitet orbiti Ganimeda 31 Suchasne znachennya ekscentrisitetu stanovit blizko 0 0013 sho mozhe buti naslidkom jogo zbilshennya za rahunok rezonansu v minuli epohi 30 Ale yaksho vin ne zbilshuyetsya v nash chas to vinikaye pitannya chomu vin ne obnulivsya cherez priplivnu disipaciyi energiyi v nadrah Ganimeda 31 Mozhlivo ostannye zbilshennya ekscentrisitetu vidbulosya nedavno kilka soten miljoniv rokiv tomu 31 Oskilki ekscentrisitet orbiti Ganimeda vidnosno nevelikij v serednomu 0 0015 30 priplivne rozigrivannya cogo suputnika zaraz neznachne 31 Odnak v minulomu Ganimed mozhlivo mig odin abo dekilka raziv projti cherez rezonans podibnij do laplasovogo yakij buv zdatnij zbilshiti ekscentrisitet orbiti do znachen 0 01 0 02 4 31 Ce jmovirno viklikalo suttyeve priplivne rozigrivannya nadr Ganimeda sho moglo stati prichinoyu tektonichnoyi aktivnosti sho sformuvala nerivnij landshaft 4 31 Ye dvi gipotezi pohodzhennya laplasivskogo rezonansu Io Yevropi ta Ganimeda te sho vin isnuvav z chasiv poyavi Sonyachnoyi sistemi 32 abo sho vin z yavivsya piznishe U drugomu vipadku jmovirnij takij rozvitok podij Io pidijmala na Yupiteri priplivi yaki prizveli do yiyi viddalennya vid nogo doki vona ne vstupila v rezonans 2 1 z Yevropoyu pislya cogo radius orbiti Io prodovzhuvav zbilshuvatisya ale chastina kutovogo momentu bula peredana Yevropi i vona takozh viddalilasya vid Yupitera proces prodovzhuvavsya doki Yevropa ne vstupila v rezonans 2 1 z Ganimedom 31 Zreshtoyu radiusi orbit cih troh suputnikiv dosyagli znachen yaki vidpovidali rezonansu Laplasa 31 Fizichni harakteristiki red Sklad red nbsp Rizka granicya mizh davnim temnim landshaftom oblasti Nikolsona ta molodoyu yaskravoyu boroznoyu ArpagiyiSerednya gustina Ganimeda stanovit 1 936 g sm3 Jmovirno vin skladayetsya z rivnih kilkostej skelnih porid i vodi perevazhno zamerzloyi 4 Masova chastka lodu stanovit 46 50 sho desho nizhche nizh u Kallisto 33 V lodah mozhut mistitisya deyaki letki gazi taki yak amiak 24 33 Tochnij sklad skelnih porid Ganimeda nevidomij ale vin jmovirno blizkij do skladu zvichajnih hondritiv grup L i LL yaki vidriznyayutsya vid H hondritiv menshim povnim vmistom zaliza menshim vmistom metalichnogo zaliza i bilshim oksidu zaliza Spivvidnoshennya mas zaliza i kremniyu na Ganimedi stanovit 1 05 1 27 dlya porivnyannya u Soncya vono dorivnyuye 1 8 Albedo poverhni Ganimeda stanovit blizko 43 34 Vodyanij lid ye praktichno na vsij poverhni i jogo masova chastka kolivayetsya v mezhah 50 90 4 sho znachno vishe nizh na Ganimedi v cilomu Blizhnya infrachervona spektroskopiya pokazala nayavnist shirokih absorbcijnih smug vodyanogo lodu na dovzhinah hvil 1 04 1 25 1 5 2 0 i 3 0 mkm 34 Svitli dilyanki mensh rivni i mayut bilshu kilkist lodu u porivnyanni z temnimi 35 Analiz ultrafioletovogo i blizhnogo infrachervonogo spektra z visokoyu rozdilnistyu otrimanih kosmichnim aparatom Galileo i nazemnimi instrumentami pokazav nayavnist i inshih rechovin vuglekislogo gazu dioksidu sirki ta mozhlivo cianu sirchanoyi kisloti i riznih organichnih spoluk 4 36 Za rezultatami misiyi Galileo peredbachayetsya nayavnist na poverhni deyakoyi kilkosti toliniv 37 Rezultati Galileo takozh pokazali nayavnist na poverhni Ganimeda sulfatu magniyu MgSO4 i mozhlivo sulfatu natriyu Na2SO4 27 38 Ci soli mogli utvoritisya v pidzemnomu okeani 38 Poverhnya Ganimeda asimetrichna Veducha pivkulya povernuta v bik ruhu suputnika po orbiti svitlisha nizh vedena 34 Na Yevropi situaciya taka zh a na Kallisto protilezhna 34 Na vedenij pivkuli Ganimeda mabut bilshe dioksidu sirki 39 40 Kilkist vuglekislogo gazu na obidvoh pivkulyah odnakova ale jogo nemaye poblizu polyusiv 36 41 Udarni krateri na Ganimedi krim odnogo ne pokazuyut zbagachennya vuglekislim gazom sho takozh vidriznyaye cej suputnik vid Kallisto Pidzemni zapasi vuglekislogo gazu na Ganimedi buli jmovirno vicherpani she v minulomu 41 Poverhnya red Dokladnishe Spisok krateriv Ganimeda en nbsp Mozayika z fotografij protiyupiterianskoyi pivkuli Ganimeda Temna davnya zona u verhnomu pravomu kuti oblast Galileya ru Yiyi viddilyayut vid oblasti Mariusa menshoyi temnoyi oblasti livoruch svitli viboyini Uruk en Yaskrava promenista struktura znizu svizhij lid vikinutij pri poyavi vidnosno molodogo kratera Osiris nbsp Zobrazhennya vedenoyi pivkuli Ganimeda zroblene z kosmichnogo aparata Galileo kolori pidsileni 42 U pravomu nizhnomu kuti vidno yaskravi promeni kratera Tashmet a u verhnomu pravomu velike pole vikidiv z kratera Hershef Chastina temnoyi oblasti Nikolsona roztashovuyetsya znizu livoruch Zgori pravoruch vona mezhuye z viboyinami Garpagiya nbsp Foto Ganimeda po centru meridian 45 zh d Temni dilyanki oblast Perrajna zgori ta oblast Nikolsona znizu promenisti krateri Tros zgori pravoruch i Chisti znizu livoruch nbsp Svitli i temni regioni na poverhni GanimedaPoverhnya Ganimeda ye sumishshyu dilyanok dvoh tipiv duzhe davnih silno kraterovanih temnih oblastej i desho molodshih ale vse zh davnih svitlih oblastej pokritih boroznami kanavkami ta grebenyami Temni dilyanki poverhni zajmayut blizko 1 3 vsiyeyi ploshi 43 ta mistyat glini j organichni rechovini sho mozhe vkazuvati na sklad planetozimalej z yakih utvorilisya suputniki Yupitera 44 Poki sho nevidomo sho viklikalo nagrivannya neobhidne dlya formuvannya boroznistoyi poverhni Ganimeda Za suchasnimi uyavlennyami taka poverhnya naslidok tektonichnih procesiv 4 Kriovulkanizm vidigraye jmovirno drugoryadnu rol yaksho vidigraye vzagali 4 Sili sho stvorili v litosferi Ganimeda silni napruzhennya neobhidni dlya tektonichnih ruhiv mogli buti pov yazani z priplivnim rozigrivannyam u minulomu prichinoyu yakogo mozhlivo buli nestabilni orbitalni rezonansi cherez yaki prohodiv suputnik 4 45 Priplivna deformaciya lodiv mogla rozigriti nadra Ganimeda ta viklikati napruzhennya v litosferi sho prizvelo do poyavi trishin gorstiv i grabeniv Pri comu na 70 ploshi suputnika bula sterta stara temna poverhnya 4 46 Formuvannya boroznistoyi poverhni takozh mozhe buti pov yazane z rannim formuvannyam yadra suputnika ta nastupnim priplivnim rozigrivannyam jogo nadr sho v svoyu chergu viklikalo zbilshennya Ganimeda na 1 6 zavdyaki teplovomu rozshirennyu ta fazovim perehodam u lodi 4 Mozhlivo v hodi nastupnoyi evolyuciyi vid yadra do poverhni pidnimalisya plyumi z rozigritoyi vodi viklikayuchi deformaciyi litosferi 47 Najimovirnishe suchasne dzherelo tepla v nadrah suputnika radioaktivne rozigrivannya yake mozhe prinajmni chastkovo zabezpechiti isnuvannya pidpoverhnevogo vodnogo okeanu Modelyuvannya pokazuye sho yaksho b ekscentrisitet orbiti Ganimeda buv na poryadok bilshim vid suchasnogo a ce mozhlivo bulo v minulomu priplivne rozigrivannya moglo buti silnishim vid radioaktivnogo 48 nbsp Krateri Gula ta Aheloj nizhche U kozhnogo vidno val i p yedestal iz vikidiv Udarni krateri ye na dilyankah poverhni oboh tipiv ale v temnih oblastyah yih osoblivo bagato ci oblasti nasicheni kraterami i mabut yih relyef formuvavsya perevazhno same zitknennyami 4 Na yaskravih boroznistih dilyankah krateriv nabagato menshe i voni ne vidigrali znachnoyi roli v evolyuciyi yih relyefu 4 Shilnist krateruvannya temnih dilyanok vkazuye na vik 4 mlrd rokiv yak i v materikovih oblastej Misyacya Svitli dilyanki molodshi ale naskilki nezrozumilo 49 Osoblivoyi intensivnosti krateruvannya poverhni Ganimeda yak i Misyacya dosyaglo blizko 3 5 4 mlrd rokiv tomu 49 Yaksho ci dani tochni to bilshist udarnih krateriv zalishilasya z tiyeyi epohi i pislya cogo yihnya kilkist zbilshuvalasya neznachno 2 Deyaki krateri peresicheni boroznami a deyaki utvorilisya poverh borozen Ce vkazuye na te sho deyaki borozni dovoli davni Miscyami traplyayutsya vidnosno molodi krateri z promenyami vikidiv sho rozhodyatsya vid nih 2 50 Krateri Ganimeda bilsh ploski nizh krateri na Merkuriyi chi Misyaci Jmovirno prichinoyu cogo ye nevisoka micnist krizhanoyi kori Ganimeda yaka mozhe chi mogla zgladzhuvatisya pid diyeyu sili tyazhinnya Davni krateri yaki majzhe povnistyu zgladzheni svoyeridni prividi krateriv vidomi yak palimpsesti en 2 odnim iz najbilshih palimpsestiv Ganimeda ye fakula Memfis en diametrom 360 km Odna z primitnih geostruktur Ganimeda temna dilyanka sho nazivayetsya oblastyu Galileya ru de vidno sitku zi spryamovanih u rizni boki borozen Jmovirno svoyeyu poyavoyu cej region zobov yazanij periodu burhlivoyi geologichnoyi aktivnosti suputnika 51 Na Ganimedi ye polyarni shapki yaki jmovirno skladayutsya z vodyanogo ineyu Voni pokrivayut shiroti vishe 40 27 Vpershe polyarni shapki sposterigalisya pri proloti KA Voyadzher Jmovirno voni utvoreni molekulami vodi vibitimi z poverhni pri yiyi bombarduvanni chastinkami plazmi Taki molekuli mogli migruvati na visoki shiroti z nizkih zavdyaki riznici temperatur abo zh pohoditi z najbilsh polyarnih oblastej Rezultati rozrahunkiv ta sposterezhen dozvolyayut robiti visnovok pro te sho pravilnim ye druge 52 Nayavnist u Ganimeda vlasnoyi magnitosferi prizvodit do togo sho zaryadzheni chastinki intensivno bombarduyut lishe slabko zahisheni polyarni oblasti Utvorena vodyana para osadzhuyetsya perevazhno v najholodnishih miscyah cih zhe oblastej 52 nbsp Geologichna karta Ganimeda 11 lyutogo 2014 roku Vnutrishnya budova red nbsp Vnutrishnya budova GanimedaGanimed ye najbilshim suputnikom Sonyachnoyi sistemi 53 Za rozmirami vin bilshij za Pluton i Merkurij Prote serednya gustina jogo porivnyano nizka blizko 1 9 g sm3 tomu masa suputnika stanovit lishe polovinu masi Merkuriya Vnutrishnya struktura Ganimedu takozh diferencijovana U jogo nadrah vidilyayut porivnyano nevelike zalizne yadro otochene tovstoyu mantiyeyu iz silikativ Nad mantiyeyu prostyagayetsya shar m yakogo lodu abo okean ridkoyi vodi podibnij okeanu na Yevropi Odnak poverhnya yavlyaye soboyu tverdu lodovu shkaralupu Vcheni pidrahuvali sho okean 100 kilometriv tovshinoyu v 10 raz glibshij nizh okeani Zemli i pohovanij pid 150 km koroyu v osnovnomu z lodu Vcheni vpershe zapidozrili nayavnist okeanu v Ganimeda v 1970 h na osnovi modelej velikih suputnikiv Misiya NASA Galileo yaka vimiryala magnitne pole Ganimeda v 2002 roci zabezpechila pershi dokazi sho pidtverdzhuvali ci pidozri Nareshti kosmichnij teleskop Gabbla viyaviv perekonlivi dokazi cogo Novi sposterezhennya buli zrobleni v ultrafioletovomu svitli chogo mozhna bulo dosyagnuti tilki z kosmichnogo teleskopa visoko nad zemnoyu atmosferoyu yaka blokuye bilshist ultrafioletu Polyarni syajva pov yazani z magnitnim polem suputnika yake spuskayetsya azh do yadra Ganimeda Solovij okean vplivaye na dinamiku magnitnogo polya oskilki vzayemodiye z velicheznim magnitnim polem Yupitera yake ohoplyuye suputnik 54 Atmosfera ta ionosfera red 1972 roku grupa indijskih britanskih i amerikanskih astronomiv pracyuyuchi v indonezijskij observatoriyi imeni Bossi povidomila pro viyavlennya u suputnika tonkoyi atmosferi pid chas sposterezhennya pokrittya nim zori 55 Voni ocinili pripoverhnevij tisk atmosferi v 0 1 Pa 55 Odnak 1979 roku KA Voyadzher 1 sposterigav pokrittya Ganimedom zori k Centavra i otrimav rezultati sho superechili comu 56 Ci sposterezhennya vikonuvalisya v dalnomu ultrafioleti na dovzhinah hvil menshe 200 nm i voni buli nabagato chutlivishi do nayavnosti gaziv nizh vimiryuvannya 1972 roku u vidimomu viprominyuvanni Niyakoyi atmosferi datchiki Voyadzhera ne viyavili Verhnya mezha koncentraciyi viyavilasya na rivni 1 5 109 chastinok sm3 sho vidpovidaye pripoverhnevomu tisku menshe 2 5 mkPa 56 A ce majzhe na 5 poryadkiv menshe nizh ocinka 1972 roku 56 1995 roku v Ganimeda vse zh bula viyavlena duzhe slabka kisneva atmosfera ekzosfera duzhe shozha na znajdenu v Yevropi Ci dani buli otrimani teleskopom Gabbla 6 57 Jomu vdalosya rozrizniti slabke svitinnya atomarnogo kisnyu v dalnomu ultrafioleti na dovzhini hvil 130 4 nm i 135 6 nm Take svitinnya vinikaye koli molekulyarnij kisen rozpadayetsya na atomi pri zitknennyah z elektronami 6 sho ye dostatno perekonlivim pidtverdzhennyam isnuvannya nejtralnoyi atmosferi z molekul O2 Yiyi koncentraciya jmovirno perebuvaye v diapazoni 1 2 108 7 108 chastinok sm3 sho vidpovidaye pripoverhnevomu tisku 0 2 1 2 mkPa 6 Taki znachennya uzgodzhuyutsya z verhnoyu mezheyu vstanovlenoyu Voyadzherom 1981 roku Kisen ne ye dokazom nayavnosti na suputniku zhittya Vvazhayetsya sho vin vinikaye koli vodyanij lid na poverhni Ganimeda rozdilyayetsya na voden i kisen radiaciyeyu voden shvidshe vinositsya u kosmos cherez nizku atomnu masu 57 Svitinnya atmosferi Ganimeda yak i Yevropi neodnoridne Gabbl sposterigav dvi yaskravih plyami roztashovanih u pivnichnij ta pivdennij pivkuli bilya shirot 50 sho tochno vidpovidaye mezhi mizh zakritimi ta vidkritimi liniyami magnitosferi Ganimeda div nizhche 58 Yaskravi plyami mozhlivo ye polyarnimi syajvami viklikanimi naplivom plazmi vzdovzh vidkritih linij magnitnogo polya suputnika 59 nbsp Karta temperatur na GanimediIsnuvannya nejtralnoyi atmosferi peredbachaye j isnuvannya v suputnika ionosferi tomu sho molekuli kisnyu ionizuyutsya zitknennyami zi shvidkimi elektronami sho pribuvayut iz magnitosferi 60 i sonyachnim zhorstkim ultrafioletom 7 Odnak priroda ionosferi Ganimeda taka zh spirna yak i priroda atmosferi Deyaki zamiri Galileo pokazali pidvishenu shilnist elektroniv poblizu vid suputnika sho vkazuye na nayavnist ionosferi v toj chas yak inshi sprobi yiyi zafiksuvati zaznali nevdachi 7 Koncentraciya elektroniv poblizu poverhni za riznimi ocinkami kolivayetsya v diapazoni vid 400 do 2500 sm 3 7 Stanom na 2008 rik parametri mozhlivoyi ionosferi Ganimeda ne vstanovleni Dodatkova vkazivka na isnuvannya kisnevoyi atmosferi Ganimeda viyavlennya za spektralnimi danimi gaziv vmorozhenih u lid na jogo poverhni Pro viyavlennya smug poglinannya ozonu O3 bulo povidomleno 1996 roku 61 1997 roku spektralnij analiz viyaviv liniyi poglinannya dimera abo dvoatomnogo kisnyu Taki liniyi poglinannya mozhut vinikali lishe yaksho kisen perebuvaye u shilnij fazi Najkrashe poyasnennya molekulyarnij kisen vmorozhenij u lid Glibina dimernih smug poglinannya zalezhit vid shiroti j dovgoti ale ne vid poverhnevogo albedo voni shilni do zmenshennya z shirotoyu v toj chas yak tendenciya dlya O3 protilezhna 62 Laboratorni eksperimenti dozvolili vstanoviti sho pri temperaturi 100 K harakternij dlya poverhni Ganimeda O2 rozchinyayetsya v lodi a ne zbirayetsya v bulbashki 63 Viyavivshi v atmosferi Yevropi natrij vcheni pochali shukati jogo i v atmosferi Ganimeda 1997 roku stalo zrozumilo sho jogo tam nemaye tochnishe yak minimum u 13 raziv menshe nizh na Yevropi Ce mozhe poyasnyuvatisya jogo nestacheyu na poverhni abo tim sho magnitosfera Ganimeda pereshkodzhaye zaryadzhenim chastinkam vibivati jogo zvidti 64 Krim togo v atmosferi Ganimeda pomicheno atomarnij voden Vin sposterigavsya na vidstani do 3000 km vid poverhni suputnika Jogo koncentraciya bilya poverhni blizko 1 5 104 sm 3 65 Magnitosfera red Kosmichnij aparat Galileo z 1995 po 2000 roki vikonav shist blizkih prolotiv bilya Ganimeda G1 G2 G7 G8 G28 i G29 5 ta viyaviv sho Ganimed maye dovoli potuzhne magnitne pole i navit svoyu magnitosferu yaka ne zalezhit vid magnitnogo polya Yupitera 66 67 Velichina magnitnogo momentu stanovit 1 3 1013 Tl m3 5 sho vtrichi bilshe nizh u Merkuriya Vis magnitnogo dipolya nahilena na 176 vidnosno osi obertannya Ganimeda sho oznachaye yiyi spryamovanist proti magnitnogo momentu Yupitera 5 Pivnichnij magnitnij polyus Ganimeda roztashovuyetsya nizhche ploshini orbiti Indukciya dipolnogo magnitnogo polya stvorenogo postijnim magnitnim momentom na ekvatori suputnika dorivnyuye 719 2 nTl 5 dlya porivnyannya indukciya magnitnogo polya Yupitera na vidstani Ganimeda dorivnyuye 120 nTl 67 Protilezhnist napryamkiv magnitnogo polya Ganimeda ta Yupitera robit mozhlivim magnitne perez yednannya Indukciya vlasnogo magnitnogo polya Ganimeda na jogo polyusah udvichi bilsha nizh na ekvatori i dorivnyuye 1440 nTl 5 nbsp Magnitne pole Ganimeda v poli Yupitera Zamkneni silovi liniyi vidmicheni zelenim kolorom Ganimed yedinij suputnik u Sonyachnij sistemi v yakogo ye vlasna magnitosfera Vona duzhe mala ta zanurena v magnitosferu Yupitera 67 Yiyi diametr blizko 2 2 5 diametra Ganimeda 66 yakij stanovit 5268 km 68 U magnitosferi Ganimeda ye oblast zamknenih silovih linij roztashovana nizhche 30 shiroti de zaryadzheni chastinki elektroni ta ioni opinyayutsya u pastci stvoryuyuchi svoyeridnij radiacijnij poyas 68 Osnovnij vid ioniv u magnitosferi ioni kisnyu O 69 sho dobre uzgodzhuyetsya z rozridzhenoyu kisnevoyu atmosferoyu suputnika U shapkah polyarnih oblastej na shirotah vishe 30 silovi liniyi magnitnogo polya ne zamkneni ta z yednuyut Ganimed z ionosferoyu Yupitera 68 U cih oblastyah buli viyavleni elektroni ta ioni sho mayut visoku energiyu desyatki j sotni kiloelektronvolt 60 yaki i mozhut viklikati polyarni syajva sho sposterigayutsya navkolo polyusiv Ganimeda 58 Krim togo vazhki ioni neperervno osadzhuyutsya na polyarnij poverhni suputnika rozpilyuyuchi en ta zatemnyuyuchi lid 60 Vzayemodiya mizh magnitosferoyu Ganimeda ta plazmoyu Yupitera bagato v chomu nagaduye vzayemodiyu mizh sonyachnim vitrom i zemnoyu magnitosferoyu 68 70 Plazma obertayetsya razom iz Yupiterom i zishtovhuyetsya z magnitosferoyu Ganimeda na jogo vedenij storoni yak i sonyachnij viter iz zemnoyu magnitosferoyu Osnovna vidminnist shvidkist plazmovogo potoku nadzvukova u vipadku Zemli ta dozvukova u vipadku Ganimeda Same tomu v magnitnogo polya Ganimeda nemaye udarnoyi hvili z zapiznyuvalnogo boku 70 Krim magnitnogo momentu Ganimed maye indukovane dipolne magnitne pole 5 Jogo viklikayut zmini magnitnogo polya Yupitera poblizu suputnika Indukovanij dipolnij moment napravlenij do Yupitera chi vid nogo zgidno z pravilom Lenca Indukovane magnitne pole Ganimeda na poryadok slabshe vid vlasnogo Jogo indukciya na magnitnomu ekvatori blizko 60 nTl vdvichi menshe nizh napruzhenist polya Yupitera tam zhe 5 Indukovane magnitne pole Ganimeda nagaduye analogichni polya Kallisto ta Yevropi i vkazuye na te sho cej suputnik takozh maye pidpoverhnevij vodnij okean z visokoyu elektroprovidnistyu 5 Oskilki Ganimed povnistyu diferencijovanij i maye metalichne yadro 4 22 jogo postijne magnitne pole jmovirno generuyetsya tim samim sposobom sho i zemne yak rezultat peremishen elektroprovidnoyi rechovini v nadrah 5 22 Yaksho magnitne pole viklikane magnitogidrodinamichnim efektom 5 71 to ce jmovirno rezultat konvektivnogo ruhu riznih rechovin u yadri 22 Nezvazhayuchi na nayavnist zaliznogo yadra magnitosfera Ganimeda zalishayetsya zagadkoyu osoblivo z vrahuvannyam togo sho v inshih podibnih til yiyi nemaye 4 Z deyakih doslidzhen viplivaye sho take malenke yadro vzhe 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