Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..apr.k1023f&link_type=abstract
American Physical Society, April Meeting, 2004, May 1-4, 2004, Denver, Colorado April 2004, MEETING ID: APR04, abstract #K1.023
Astronomy and Astrophysics
Astrophysics
Scientific paper
Expanding magnetic bubbles are observed to emerge from active galactic nuclei and are believed to play an important role in the central regions of galaxy clusters. Here, we study the evolution of magnetic bubbles using two approaches. First, bubbles are simulated using a 3D implicit MHD code called FLIP-MHD. Second, we investigate similarity solutions designed to capture the intermediate asymptotic regime in which the plasma length scales are much larger than those in the accretion disk but much smaller than the scales in the exterior plasma. The two approaches are complementary because the simulations capture, for a specific configuration, the complete evolution, including magnetic reconnection and flux conversion operational in the transition between the initial state connected to the disk and the self-similar intermediate states. The self-similar solutions, instead, generalise the conclusions of the simulations and provide scaling laws of more general applicability. The comparison of the two approaches allows us to gauge the relevance of self-similar solutions to astrophysics processes.
Finn John M.
Lapenta Giovanni
Li Handong
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