[en] The Cassini spacecraft Ultraviolet Imaging Spectrograph (UVIS) obtained observations of Jupiter's auroral emissions in H-2 band systems and H Lyman-alpha from day 275 of 2000 (October 1), to day 81 of 2001 (March 22). Much of the globally integrated auroral variability measured with UVIS can be explained simply in terms of the rotation of Jupiter's main auroral arcs with the planet. These arcs were also imaged by the Space Telescope Imaging Spectrograph (STIS) on Hubble Space Telescope (HST). However, several brightening events were seen by UVIS in which the global auroral output increased by a factor of 2-4. These events persisted over a number of hours and in one case can clearly be tied to a large solar coronal mass ejection event. The auroral UV emissions from these bursts also correspond to hectometric radio emission (0.5-16 MHz) increases reported by the Galileo Plasma Wave Spectrometer (PWS) and Cassim Radio and Plasma Wave Spectrometer (RPWS) experiments. In general, the hectometric radio data vary differently with longitude than the UV data because of radio wave beaming effects. The 2 largest events in the UVIS data were on 2000 day 280 (October 6) and on 2000 days 325-326 (November 20-21). The global brightening events on November 20-21 are compared with corresponding data on the interplanetary magnetic field, solar wind conditions, and energetic particle environment. ACE (Advanced Composition Explorer) solar wind data was numerically propagated from the Earth to Jupiter with an MHD code and compared to the observed event. A second class of brief auroral brightening events seen in HST (and probably UVIS) data that last for similar to 2 min is associated with aurora] flares inside the main auroral ovals. On January 8, 2001, from 18:45-19:35 UT UVIS H-2 band emissions from the north polar region varied quasiperiodically. The varying emissions, probably due to amoral flares inside the main auroral oval, are correlated with low-frequency quasiperiodic radio bursts in the 0.6-5 kHz Galileo PWS data. (c) 2005 Elsevier Inc. All rights reserved.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Pryor, Wayne R.; Central Arizona College
Stewart, A. Ian F.; University of Colorado > Laboratory for Atmospheric and Space Physics
Esposito, Larry W.; University of Colorado > Laboratory for Atmospheric and Space Physics
McClintock, William E.; University of Colorado > Laboratory for Atmospheric and Space Physics
Colwell, Joshua E.; University of Colorado > Laboratory for Atmospheric and Space Physics
Jouchoux, Alain J.; University of Colorado > Laboratory for Atmospheric and Space Physics
Steffl, Andrew J.; University of Colorado > Laboratory for Atmospheric and Space Physics
Shemansky, Donald E.; University of Southern California
Ajello, Joseph M.; Jet Propulsion Laboratory
West, Robert A.; Jet Propulsion Laboratory
Hansen, Candace J.; Jet Propulsion Laboratory
Tsurutani, Bruce T.; Jet Propulsion Laboratory
Kurth, William S.; University of Iowa
Hospodarsky, George B.; University of Iowa
Gurnett, Donald A.; University of Iowa
Hansen, Kenneth C.; University of Michigan
Waite, J. Hunter; University of Michigan
Crary, Frank J.; Southwest Research Institute (San Antonio)
Young, David T.; Southwest Research Institute (San Antonio)
Krupp, Norbert; Max-Planck-Institut für Sonnensystemforschung
Clarke, John T.; Boston University
Grodent, Denis ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Dougherty, Michele K.; kUniversity College (London)
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