Europa's Differentiated Internal Structure: Inferences from Two Galileo Encounters

Autor:	William B. Moore, John D. Anderson, E. L. Lau, Gerald Schubert, W. L. Sjogren
Rok vydání:	1997
Předmět:	Multidisciplinary Extraterrestrial Environment Ice Mineralogy Champ magnetique Flight experiment Silicate Jovian Galileo spacecraft Mantle (geology) Astrobiology chemistry.chemical_compound chemistry Gravitational field Jupiter Geology
Zdroj:	Science. 276:1236-1239
ISSN:	1095-9203 0036-8075
DOI:	10.1126/science.276.5316.1236
Popis:	Doppler data generated with the Galileo spacecraft’s radio carrier wave during two Europa encounters on 19 December 1996 (E4) and 20 February 1997 (E6) were used to measure Europa’s external gravitational field. The measurements indicate that Europa has a predominantly water ice-liquid outer shell about 100 to 200 kilometers thick and a deep interior with a density in excess of about 4000 kilograms per cubic meter. The deep interior could be a mixture of metal and rock or it could consist of a metal core with a radius about 40 percent of Europa’s radius surrounded by a rock mantle with a density of 3000 to 3500 kilograms per cubic meter. The metallic core is favored if Europa has a magnetic field.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3655ff9bcc9873a9a12a72b1c71f54c9 https://doi.org/10.1126/science.276.5316.1236 Zobrazit plný text záznamu