Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Juno-UVS Observation of the Io Footprint During Solar Eclipse
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..
Show others and affiliations
2019 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 124, no 7, p. 5184-5199Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
AMER GEOPHYSICAL UNION , 2019. Vol. 124, no 7, p. 5184-5199
Keywords [en]
Io, UV-aurorae, Jupiter, Io footprint, Io atmosphere, Juno
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-259463DOI: 10.1029/2018JA026431ISI: 000482985600017Scopus ID: 2-s2.0-85068791074OAI: oai:DiVA.org:kth-259463DiVA, id: diva2:1352874
Conference
ARKE JT, 1994, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, V99, P8387 adstone G. R., 2017, GEOPHYSICAL RESEARCH LETTERS, V44, P7668 ary FJ, 1997, GEOPHYSICAL RESEARCH LETTERS, V24, P2135 ur J., 2013, ASTRONOMY & ASTROPHYSICS, V552, attacharya B, 2001, GEOPHYSICAL RESEARCH LETTERS, V28, P2751 a Xianzhe, 2010, SPACE SCIENCE REVIEWS, V152, P271 adstone G. Randall, 2017, SPACE SCIENCE REVIEWS, V213, P447 mmer Joshua A., 2018, SPACE TELESCOPES AND INSTRUMENTATION 2018: ULTRAVIOLET TO GAMMA RAYConference on Space Telescopes and Instrumentation - Ultraviolet to Gamma Ray, JUN 10-15, 2018, Austin, TX, V10699, ls Vincent, 2012, JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, V117, cobsen S., 2007, GEOPHYSICAL RESEARCH LETTERS, V34,
Note

QC 20190920

Available from: 2019-09-20 Created: 2019-09-20 Last updated: 2019-09-20Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records BETA

Roth, Lorenz

Search in DiVA

By author/editor
Roth, Lorenz
By organisation
Space and Plasma Physics
In the same journal
Journal of Geophysical Research - Space Physics
Fusion, Plasma and Space Physics

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 58 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf