Is Jupiter's Magnetosphere an Effective Shield from Solar Activity?

Details Is Jupiter's Magnetosphere an Effective Shield from Solar Activity? Is Jupiter's Magnetosphere an Effective Shield from Solar Activity?

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.4103l&link_type=abstract

American Astronomical Society, DPS meeting #38, #41.03; Bulletin of the American Astronomical Society, Vol. 38, p.558

Astronomy and Astrophysics

Astronomy

Scientific paper

We are initiating an investigation of the relationship between Jupiter's mid-infrared auroral emission and solar activity. Ground-based mid-IR and Voyager IRIS data and sunspot number over the last three solar cycles suggest a connection between the onset of maximum solar activity and enhanced mid-IR auroral emission. Such a correlation previously has been demonstrated between Jupiter's hectometric radio emissions and EUV and X-ray auroral flaring, but has not been investigated in relation to the mid-IR auroral emissions. Mid-infrared auroral emission by ethane at 12 micron wavelength arises relatively deep in the polar stratosphere in comparison to shorter-wavelength prompt auroral emissions and magnetospheric radio emission processes, as the emission must form below the homopause. The nature of the connection between solar activity, the solar wind, prompt high-altitude emissions, and deeper auroral emissions, remains to be investigated. Relevant radio astronomy and solar wind data from the Voyager, Ulysses, ACE, and Wind spacecraft have been identified and we plan to use these data sets to test for correlations between auroral and solar phenomena. Prompt auroral emission processes can be measured from ultraviolet spectra acquired with the IUE satellite over the interval 1979-1996, including a dedicated six-week period in 1996. The IUE data set includes campaigns directly correlated with IR measurement campaigns, which have not yet been analyzed in direct comparison to each other. A correlation study comparing the mid-infrared and UV measures of auroral activity would provide insight into whether energetic processes affecting the different altitude regions are related. Results of this research will address NASA's Strategic Objectives to understand the relationship between the Sun and planets and the history and evolution of the solar system in preparation for future space missions (e.g., Juno).

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