Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...686.1432g&link_type=abstract
The Astrophysical Journal, Volume 686, Issue 2, pp. 1432-1446.
Astronomy and Astrophysics
Astronomy
3
Magnetic Fields, Sun: Activity, Sun: Filaments, Sun: Sunspots
Scientific paper
Bipolar active regions tend to emerge in tight clusters that persist at the same location in so-called activity nests. This study examines how flux evolves inside three different arrangements of interacting nests. Each contains ~2×1023 Mx, and each develops local flux imbalances that interact to form filaments and filament channels. They include: a pair of isolated closely packed nests; a pair of widely spaced nests with neighboring nests on their outer flanks; and a chain of three closely packed nests. These cases result in flux imbalances that are, respectively: large and concentrated on the outer edges of the nests; large and concentrated between the nests; and weak and concentrated on the outer edges of the nests. An amount of flux equivalent to a single large sunspot pair, but composed entirely of weaker flux densities (<|50| G), is representative of the net fluxes measured for all three examples of multiple activity nests. In the majority of cases, the pools of net flux form filament channels, i.e., configurations with a clear horizontal component of the magnetic field directed along a polarity inversion line (PIL). This study proposes that large quiescent filaments and their channels are natural storehouses of magnetic energy constructed by surface flows out of slowly reconnecting pools of ``orphaned'' magnetic flux that originate at outer boundaries of decaying activity nests.
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