Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh53b1500g&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH53B-1500
Physics
7807 Charged Particle Motion And Acceleration, 7845 Particle Acceleration, 7852 Solitons And Solitary Waves (4455)
Scientific paper
Having crossed the termination shock (TS) and entering the heliosheath (HS) in December 2004, Voyager-1 found steady high particle fluxes, little variability, and small anisotropies. At the same time, ACRs did not unfold to form an unmodulated spectrum, and ACR flux continued to increase as V-1 moved deeper into the inner HS. The seemingly two-population spectrum was interpreted in terms of a magnetic field configuration where field lines intersect the TS multiple times (Kóta and Jokipii, 2004; Jokipii et al., 2004). The shock will not produce a uniform power law spectrum at places, like the nose, where field lines cross and re-cross the shock, since time for acceleration is insufficient, acceleration can start only when the field line hits the shock. Recently, McComas and Schwadron (2006) suggested that ACRs are primarily accelerated at the flanks of the TS. We shall discuss a model similar to the blunt shock of McComas and Schwadron (2006). Numerical simulations will be presented using two alternative approaches. First, we consider field aligned motion described by the focused transport-equation retaining pitch angle distribution, and adding cross field diffusion in an ad hoc way. Second, we consider a 2-D diffusive transport equation for a model including multiple intersection between the shock and field lines. We find that, as anticipated and suggested by our earlier preliminary results, predicted ACRs fluxes turn out, indeed, continue to increase in the HS behind the shock. Some implications of the results will be discussed, and possible effects of a dynamically moving shock will be briefly addressed. Jokipii, J.R. et al., Astrophys.~J., 611, L141 (2004) Kóta, J. and J.R. Jokipii, in `Physics of the Outer Heliosphere', ed. V. Florinski et al., AIP 719, 272--278 (2004). McComas, D.J. and N.A. Schwadron, Geophys.~Res.~Lett., 33 25437 (2006).
Giacalone Joe
Jokipii Randy J.
Kota József
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