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PLANETARY X-RAY AURORAS. Randy Gladstone Southwest Research Institute San Antonio, TX USA. European Planetary Science Congress 21 September 2006 Berlin. Saturn: No clear auroral signature seen Jupiter:
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Southwest Research Institute
San Antonio, TX USA
European Planetary Science Congress
21 September 2006
Initial Chandra & XMM observations showed no aurora [Ness et al. 2004a;b].
A hint of aurora appears on Jan. 20, 2004, but is not statistically significant. Instead of correlating with FUV emissions observed by HST, the x-rays match the variability of a fortuitous solar flare [Bhardwaj et al. 2005; Clarke et al. 2005].
Polar brightness maps in latitude & system III longitude, from Dec. 2000. The north hot spot is near 67ºN, III=170º; the south hot spot drifts like the 7.8 m hot spots seen by Caldwell et al. .
The distinct 45-minute pulsation period observed in Dec. 2000 (above) was not seen in Feb. 2003 (right), or in XMM data from Apr. and Nov. 2003. The pulsations are still there, but they aren’t nearly as regular as when first detected
[Elsner et al. 2005]
High IMF, fast flow
simulation of pulsed reconnection at magnetopause produces good agreement with Chandra/STIS flare observations
Smoothed XMM EPIC images of Jupiter in narrow spectral bands: Auroral emissions due to precipitating O ions are easily distinguished from reflected solar x-ray lines at higher energies
[Branduardi-Raymont et al. 2006]
OVII (0.55-0.60 keV)
OVIII (0.63-0.68 keV)
FeXVII (0.70-0.75 & 0.80-0.85 keV)
MgXI (1.30-1.40 keV)
Blue: South aurora
XMM-Newton EPIC spectra from Nov. 2003 observations of Jupiter. Data points for the North and South aurorae are in white and blue, respectively; purple is for non-auroal disk emissions. At >2 keV, bremsstrahlung dominates. [Branduardi-Raymont et al. 2006]
2-12 keV, low spatial resolution
0.1-10 keV, with very high spatial resolution
(0.5", ~0.3 km from apogee)
Point at fixed RA & DEC, let Earth drift through FOV
aim for cusp * at various LTs
Ex ~ 1273/(20*60)/100/
~ 1.0e5 photons/cm2/s/sr
completely consistent with