{"id":624,"date":"2013-09-19T09:25:00","date_gmt":"2013-09-19T07:25:00","guid":{"rendered":"https:\/\/kids.esa.int\/re-entry_nears_for_esa_s_ferrari_of_space\/"},"modified":"2026-10-08T00:30:24","modified_gmt":"2026-10-07T22:30:24","slug":"re-entry_nears_for_esa_s_ferrari_of_space","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/hu\/re-entry_nears_for_esa_s_ferrari_of_space\/","title":{"rendered":"K\u00f6zeledik az ESA \u2018\u0171rbeli Ferrarij\u00e1nak\u2019 visszat\u00e9r\u00e9se\u2019"},"content":{"rendered":"<div class=\"lede\">\n<p>T\u00f6bb mint n\u00e9gy \u00e9vnyi p\u00e1ly\u00e1n t\u00f6lt\u00f6tt id\u0151 ut\u00e1n az ESA GOCE-misszi\u00f3ja a v\u00e9g\u00e9hez k\u00f6zeledik. Okt\u00f3ber k\u00f6zep\u00e9n a m\u0171hold \u00fczemanyaga elfogy, \u00e9s p\u00e1ly\u00e1ja cs\u00f6kkenni kezd. A l\u00e9gk\u00f6rbe val\u00f3 visszat\u00e9r\u00e9s v\u00e1rhat\u00f3an k\u00f6r\u00fclbel\u00fcl h\u00e1rom h\u00e9ttel k\u00e9s\u0151bb k\u00f6vetkezik be.<\/p>\n<\/div>\n<p>A GOCE 2009 m\u00e1rciusa \u00f3ta kering a F\u00f6ld k\u00f6r\u00fcl, kevesebb mint 270 km-es magass\u00e1gban, ami egy tudom\u00e1nyos m\u0171hold eset\u00e9ben szokatlanul alacsony. Feladata az volt, hogy p\u00e1ratlan pontoss\u00e1ggal felt\u00e9rk\u00e9pezze a F\u00f6ld felsz\u00edni gravit\u00e1ci\u00f3j\u00e1nak apr\u00f3 elt\u00e9r\u00e9seit.<\/p>\n<p>A gravit\u00e1ci\u00f3 az az er\u0151, amely mindent a f\u00f6ld fel\u00e9 vonz. A F\u00f6ld gravit\u00e1ci\u00f3s vonz\u00e1sa azonban helyenk\u00e9nt kiss\u00e9 elt\u00e9r. Ez r\u00e9szben annak k\u00f6sz\u00f6nhet\u0151, hogy a bolyg\u00f3 nem t\u00f6k\u00e9letesen g\u00f6mb\u00f6ly\u0171 \u2013 a sarkokn\u00e1l kiss\u00e9 lap\u00edtott. A gravit\u00e1ci\u00f3t a magas hegyek \u00e9s a m\u00e9ly \u00f3ce\u00e1ni \u00e1rokvonalak, valamint az \u00f3ce\u00e1nok \u00e9s a k\u0151zetr\u00e9tegek vastags\u00e1ga \u00e9s s\u0171r\u0171s\u00e9ge is befoly\u00e1solja.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"3000\" data-credit=\"ESA\/HPF\/DLR\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2011\/03\/New_GOCE_geoid2\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2011\/03\/new_goce_geoid2\/17882511-2-eng-GB\/New_GOCE_geoid.jpg\" alt=\"New GOCE geoid\"><figcaption>\u00daj GOCE-geoid<\/figcaption><\/figure>\n<p>Ahogy a GOCE k\u00fcl\u00f6nb\u00f6z\u0151 gravit\u00e1ci\u00f3s er\u0151vel rendelkez\u0151 r\u00e9gi\u00f3k felett halad el, az \u0171reszk\u00f6z fel-le mozog, \u00e9s m\u0171szerei jelzik ezeket a p\u00e1lyav\u00e1ltoz\u00e1sokat. Az ilyen prec\u00edz m\u00e9r\u00e9seket alacsony p\u00e1ly\u00e1ja \u00e9s karcs\u00fa, aerodinamikai kialak\u00edt\u00e1sa tette lehet\u0151v\u00e9, ami miatt az \u0171reszk\u00f6z a \u2018\u0171r Ferrarija\u2019 becenevet kapta. Ez az egyed\u00fcl\u00e1ll\u00f3 m\u0171hold rendk\u00edv\u00fcl stabil is, mivel nem tartalmaz olyan mozg\u00f3 alkatr\u00e9szeket, amelyeket m\u00e1s \u0171reszk\u00f6z\u00f6k\u00f6n gyakran alkalmaznak.<\/p>\n<p>A GOCE adatait az \u00f3ce\u00e1ni \u00e1ramlatok, a v\u00e1ltoz\u00f3 tengerszint, a sz\u00e1razf\u00f6ld felsz\u00edni magass\u00e1ga, valamint a F\u00f6ld k\u0151zetr\u00e9teg\u00e9nek r\u00e9teges fel\u00e9p\u00edt\u00e9s\u00e9nek vizsg\u00e1lat\u00e1ra haszn\u00e1lt\u00e1k fel. A m\u0171hold m\u00e9g az \u0171rben f\u00faj\u00f3 szeleket \u00e9s azokat a hanghull\u00e1mokat is \u00e9szlelte, amelyek a 2011. m\u00e1rcius 11-\u00e9n Jap\u00e1nt s\u00fajt\u00f3 hatalmas f\u00f6ldreng\u00e9s ut\u00e1n felfel\u00e9 terjedtek a l\u00e9gk\u00f6rben. Tal\u00e1n a legfontosabb eredm\u00e9ny a F\u00f6ld gravit\u00e1ci\u00f3j\u00e1nak rendk\u00edv\u00fcl pontos modellje (az \u00fagynevezett \u2018geoid\u2019) volt. A geoid azt mutatja meg, hogyan n\u00e9zne ki a F\u00f6ld, ha a gravit\u00e1ci\u00f3 a felsz\u00edn\u00e9n mindenhol egyforma lenne, \u00edgy a v\u00edz nem \u00e1ramlana egyik pontr\u00f3l a m\u00e1sikra.<\/p>","protected":false},"excerpt":{"rendered":"<p>After more than four years in orbit, ESA\u2019s GOCE mission is nearing its end. In mid-October, the satellite will run out of fuel and its orbit will begin to decay. 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