Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.2210m&link_type=abstract
American Astronomical Society, SPD meeting #42, #22.10; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Supra-arcade downflows (SADs) are downward-moving features observed in the hot, low-density region above posteruption flare arcades. They are believed to be created by patchy reconnection in the post-CME current sheet. The sizes and fluxes of SADs provide information about the process of their creation. For example, the "fractal current sheet" scenario proposed in the literature may be expected to yield a power-law distribution of sizes and/or fluxes. We examine 120 cross-sectional areas and magnetic flux estimates from observations of SADs, and find that (1) the areas are consistent with a log-normal distribution, and (2) the fluxes are consistent with both a log-normal and an exponential distribution. Neither set of measurements is compatible with a power-law distribution, and so the data do not appear to support a fractal process for SAD creation. As an alternative, we consider a simple SAD growth scenario with minimal assumptions, capable of producing a log-normal distribution.
McKenzie David Eugene
Savage Sabrina L.
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