Planetary Auroral Storms Trace a CME-driven Interplanetary Shock Throughout the Solar System, from the Sun to Saturn at 9 AU

Details Planetary Auroral Storms Trace a CME-driven Interplanetary Shock Throughout the Solar System, from the Sun to Saturn at 9 AU Planetary Auroral Storms Trace a CME-driven Interplanetary Shock Throughout the Solar System, from the Sun to Saturn at 9 AU

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p51a1419p&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #P51A-1419

Physics

6275 Saturn, 2139 Interplanetary Shocks, 2704 Auroral Phenomena (2407), 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Hubble Space Telescope FUV images taken in December 2000 revealed for the first time au auroral storm on Saturn. The Sun, the Earth, Jupiter and Saturn were practically aligned at that time, allowing the solar wind plasma to flow by all three planets successively within ~1 month. Observations of Jupiter coordinated with Cassini measurements in the nearby solar wind were also executed during this period. Using a recently developped MHD code and solar wind measurements in the Earth vicinity, we establish that (1) the strong auroral event on Saturn was related to the interaction of an interplanetary shock with its magnetosphere, (2) this shock was initiated by a series of CMEs on the Sun observed by SOHO. We follow the propagation of the shock throughout the solar system, from the Earth where auroral storms are recorded, to Jupiter where the auroral activity is strongly enhanced, and to Saturn where it ultimately activates the observed unusual polar source. This is the first report of consecutive auroral responses to a propagating interplanetary shock. It indicates that shocks retain their properties and their ability to trigger planetary auroral activity thoughout the solar system, thereby unifying our understanding of solar-planetary interactions. We discuss also the similarities and differences observed between the planetary auroral responses.

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