Geoscience Reference
In-Depth Information
Chandra ACIS-S Spectrum of Jupiter X-ray Emission
0.06
(a)
0.05
Ist exposure
IInd exposure
North Aurora
0.04
0.03
0.02
0.01
0.00
0.3
0.5
0.7
0.9
1.1
1.3
1.5
1.7
1.9
0.03
(b)
Ist exposure
IInd exposure
0.02
South Aurora
0.01
0.00
0.3
0.5
0.7
0.9
1.1
1.3
1.5
1.7
1.9
0.090
(c)
0.075
Ist exposure
IInd exposure
0.060
Disk
0.045
0.030
0.015
0.000
0.3
0.5
0.7
0.9
1.1
1.3
1.5
1.7
1.9
Energy (keV)
Fig. 9. Jupiter disk X-ray spectra (bottom panel, c) compared with auroral spectra
from the north (top panel, a) and south (middle panel, b) observed during the two
Chandra ACIS-S exposures taken on February 24 and February 25-26, 2003. Both ACIS-
S exposures were of almost same duration and taken about a day apart. Each spectral
point represents
≥
10 events. The differences between the disk and auroral spectra are
evident.
Very recently, XMM-Newton and Chandra data
26
have suggested that
there is a higher (
>
2 keV) energy component present in the spectrum of
Jupiter's aurora. The observed spectrum and flux, at times, tentatively
appears consistent with that produced by electron bremsstrahlung
1
,
32
at
energies greater than 2 keV.
5. Jupiter: Low-Latitude Disk Emissions
X-ray emission from Jupiter's low latitudes was first reported using the
ROSAT-HRI.
33
It was proposed that disk X-rays may be largely due to
the precipitation of energetic sulfur or oxygen ions into the atmosphere
