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Cassini observations of the Interplanetary Medium Upstream of Saturn and their relation to the Hubble Space Telescope aurora data

Cassini observations of the Interplanetary Medium Upstream of Saturn and their relation to the Hubble Space Telescope aurora data,10.1016/j.asr.2005.0

Cassini observations of the Interplanetary Medium Upstream of Saturn and their relation to the Hubble Space Telescope aurora data   (Citations: 11)
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We present Cassini magnetometer and plasma data for the January 2004 ‘solar wind campaign’ in which the particles and fields instruments monitored the solar wind and interplanetary magnetic field, while the Hubble Space Telescope (HST) simultaneously observed the UV aurora in Saturn’s southern ionosphere. Clear structuring is evident in the data which is associated with the highly developed nature of corotating interaction regions (CIRs) at this distance. The interplanetary medium during January consisted of four distinct types of behaviour. We see a ‘major’ compression region at the start of the interval followed by a rarefaction region, a ‘minor’ compression region, an ‘intermediate’ rarefaction region, and another major compression region at the end of the month. The highly dynamic nature of Saturn’s aurora revealed by the HST observations appears to relate directly to the concurrent solar wind activity measured by Cassini. Collectively these data provide a unique insight into the solar wind driving of Saturn’s magnetosphere and consequent auroral response.
Journal: Advances in Space Research - ADV SPACE RES , vol. 38, no. 4, pp. 806-814, 2006
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    • ...We have specifically selected the solar wind dynamic pressure because of recent evidence that this solar wind property may play a significant role in determining the configuration and dynamics of the magnetosphere and auroral ionosphere of Saturn [Bunce et al., 2005, 2006; Jackman et al., 2005; Crary et al., 2005]...

    Bertalan Ziegeret al. Statistical validation of a solar wind propagation model from 1 to 10 ...

    • ...This study has shown that Saturn’s auroras respond strongly to the magnetospheric perturbations associated with corotating interaction region (CIR) compressions in the interplanetary medium [Clarke et al., 2005; Crary et al., 2005; Grodent et al., 2005; Bunce et al., 2005]...
    • ...However, 17 hours is used here for simplicity and commonality with previous discussion [Clarke et al., 2005; Crary et al., 2005; Bunce et al., 2005]...

    C. M. Jackmanet al. Interplanetary conditions and magnetospheric dynamics during the Cassi...

    • ...Results concerning the correlations between the main oval and the solar wind characteristics, the shape of the auroral region, its level of corotation, and brightness distribution were described by Clarke et al. [2005], Crary et al. [2005], Cowley et al. [2005], Bunce et al. [2005b], and Grodent et al. [2005]...
    • ...Clarke et al. [2005], Cowley et al. [2005], Bunce et al. [2005b], more detailed by Grodent et al. [2005], and are summarized hereafter...
    • ...[11] The highly structured nature of the IMF was discussed in detail for this interval by Bunce et al. [2005b]...
    • ...The dashed vertical lines indicate the approximate times of the HST images, shifted by 17 hours. Adapted from Bunce et al. [2005b]...

    Jean-Claude Gérardet al. Signature of Saturn's auroral cusp: Simultaneous Hubble Space Telescop...

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