Other
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh43b..06k&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SH43B-06
Other
2114 Energetic Particles (7514), 2124 Heliopause And Solar Wind Termination, 2134 Interplanetary Magnetic Fields
Scientific paper
It is likely that, in 2002-2004, Voyager-1 was still inside the termination shock, but its magnetic field line had intersected the shock between V-1 and the Sun. This may well occur if the field line intersects the shock multiple times, which can happen for a number of plausible reasons. We discuss the effects of multiple intersection in the light of new findings of V-1 since crossing the shock in December 2004. We consider the effects of such multiple intersection on the pitch-angle anisotropies and energy spectra of energetic particles near the shock. The most spectacular particle signatures of the shock-crossing of V-1 were the increase of low-energy particle fluxes, the disapperance of high beaming anisotropies, and the small variability prevailing since the crossing. On the other hand, the spectrum still has not unfolded into a smooth power-law spectrum anticipated at the shock. We stress that the shock with multiple intersection need not produce a uniform power-law everywhere along the shock. Instead, a two-population spectrum, similar to that observed by Voyager-1, may be expected when flirting field lines cross and recross the shock. We interpret the two-population spectra observed by V-1 as a signature of acceleration at different sites. The implication of the apparent double power-law spectra of the termination shock particle population will be addressed.
Jokipii Randy J.
Kota József
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