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Upper limits to Jovian hard X radiation from the Ulysses Gamma Ray Burst Experiment

1993; American Geophysical Union; Volume: 98; Issue: A12 Linguagem: Inglês

10.1029/93ja02590

2156-2202

K. Hurley, M. Sommer, J. H. Waite,

Solar and Space Plasma Dynamics

We describe the first in situ search for Jovian X radiation with a dedicated X ray instrument. Upper limits to Jupiter's X ray power in the 27‐48 keV range are presented using data taken by the gamma ray burst experiment on the inbound Ulysses trajectory, at distances between 163 and 110 R J . The data were analyzed using three methods for detection of (1) a steady flux, (2) a flux linked to System III rotation, and (3) a sporadic flux. The 3σ upper limits lie between 1.1 × 10 8 and 5.6 × 10 8 W. The results are consistent with the idea that the bulk of the Jovian UV auroral emissions are due to energetic electrons, while the previously observed low‐energy X radiation is due to ion precipitation.