مورد إلكتروني
Juno-UVS Observation of the Io Footprint During Solar Eclipse
| العنوان: | Juno-UVS Observation of the Io Footprint During Solar Eclipse |
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| بيانات النشر: | KTH, Rymd- och plasmafysik Southwest Res Inst, San Antonio, TX 78238 USA. Southwest Res Inst, San Antonio, TX 78238 USA. Univ Liege, STAR Inst, LPAP, Liege, Belgium. Univ Cologne, Inst Geophys & Meteorol, Cologne, Germany. Southwest Res Inst, San Antonio, TX 78238 USA.;Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX USA. Southwest Res Inst, San Antonio, TX 78238 USA. Univ Liege, STAR Inst, LPAP, Liege, Belgium. Univ Liege, STAR Inst, LPAP, Liege, Belgium. Southwest Res Inst, San Antonio, TX 78238 USA. Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA. Southwest Res Inst, San Antonio, TX 78238 USA. Southwest Res Inst, San Antonio, TX 78238 USA. Space Res Corp, Annapolis, MD USA.;NASA, Goddard Space Flight Ctr, Greenbelt, MD USA. Jet Prop Lab, Pasadena, CA USA. Southwest Res Inst, San Antonio, TX 78238 USA.;Univ Colorado, Lab Atmosphere & Space Phys, Boulder, CO 80309 USA. Southwest Res Inst, San Antonio, TX 78238 USA.;Univ Colorado, Lab Atmosphere & Space Phys, Boulder, CO 80309 USA. AMER GEOPHYSICAL UNION 2019 |
| تفاصيل مُضافة: | Hue, V Greathouse, T. K. Bonfond, B. Saur, J. Gladstone, G. R. Roth, Lorenz Davis, M. W. Gerard, J-C Grodent, D. C. Kammer, J. A. Szalay, J. R. Versteeg, M. H. Bolton, S. J. Connerney, J. E. P. Levin, S. M. Hinton, P. C. Bagenal, F. |
| نوع الوثيقة: | Electronic Resource |
| مستخلص: | The two main ultraviolet-signatures resulting from the Io-magnetosphere interaction are the local auroras on Io's atmosphere, and the Io footprints on Jupiter. We study here how Io's daily eclipses affect the footprint. Previous observations showed that its atmosphere collapses in eclipse. While remote observers can observe Io's local auroras briefly when Io disappears behind Jupiter, Juno is able to follow the Io footprint in the unlit hemisphere. Theoretical models of the variability of the energy flux fed into the Alfven wings, ultimately powering the footprints, are not sufficiently constrained by observations. For the first time, we use observations of Io's footprint from the Ultraviolet Spectrograph (UVS) on Juno recorded as Io went into eclipse. We benchmark the trend of the footprint brightness using observations by UVS taken over Io's complete orbit and find that the footprint emitted power variation with Jupiter's rotation shows fairly consistent trends with previous observations. Two exploitable data sets provided measurements when Io was simultaneously in eclipse. No statistically significant changes were recorded as Io left and moved into eclipse, respectively, suggesting either that (i) Io's atmospheric densities within and outside eclipse are large enough to produce a saturated plasma interaction, that is, in the saturated state, changes in Io's atmospheric properties to first order do not control the total Alfvenic energy flux, (ii) the atmospheric collapse during the Juno observations was less than previously observed, or (iii) additional processes of the Alfven wings in addition to the Poynting flux generated at Io control the footprint luminosity. QC 20190920 |
| مصطلحات الفهرس: | Io, UV-aurorae, Jupiter, Io footprint, Io atmosphere, Juno, Fusion, Plasma and Space Physics, Fusion, plasma och rymdfysik, Article in journal, info:eu-repo/semantics/article, text |
| DOI: | 10.1029.2018JA026431 |
| URL: | Journal of Geophysical Research - Space Physics, 2169-9380, 2019, 124:7, s. 5184-5199 |
| الإتاحة: | Open access content. Open access content info:eu-repo/semantics/restrictedAccess |
| ملاحظة: | English |
| أرقام أخرى: | UPE oai:DiVA.org:kth-259463 0000-0003-0554-4691 doi:10.1029/2018JA026431 ISI:000482985600017 Scopus 2-s2.0-85068791074 1234958363 |
| المصدر المساهم: | UPPSALA UNIV LIBR From OAIster®, provided by the OCLC Cooperative. |
| رقم الأكسشن: | edsoai.on1234958363 |
| قاعدة البيانات: | OAIster |
| DOI: | 10.1029.2018JA026431 |
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