[Intriligator 1995 a]
Stream interfaces and energetic ions II: Ulysses test of Pioneer results.
D. S. Intriligator, G. L. Siscoe, G. Wibberenz,
H. Kunow and J. T. Gosling.
Stream interfaces and energetic ions II: Ulysses test of Pioneer results.
Geophysical Research Letters 22, 1173-1176. 1995
Contents
Ulysses measurements of energetic and solar wind particles taken near 5 AU
between 20 and 30 degrees south latitude during a well-developed recurring
corotating interaction region (CIR) show that the CIR's corotating energetic
ion population (CEIP) associated with the trailing reverse shock starts
within the CIR at the stream interface.
This is consistent with an earlier result obtained by Pioneers 10 and 11 in the
ecliptic plane between 4 and 6 AU.
The Ulysses/Pioneer finding is noteworthy since the stream interface is not
magnetically connected to the reverse shock, but lies 12-17 corotation
hours from it.
Thus, the finding seems to be inconsistent with the basic model that generates
CEIP particles at the reverse shock and propagates them along field lines.
Eliminating the inconsistency probably entails an extension of the standard
model such as cross-field diffusion or a non-shock energization process
operating near the stream interface closer to the sun.
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