Ellerman Bombs in a Solar Active Region: Statistical Properties and Implications

Details Ellerman Bombs in a Solar Active Region: Statistical Properties and Implications Ellerman Bombs in a Solar Active Region: Statistical Properties and Implications

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp52b05g&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP52B-05

Physics

7507 Chromosphere, 7519 Flares, 7524 Magnetic Fields, 7529 Photosphere, 7554 X Rays, Gamma Rays, And Neutrinos

Scientific paper

We have embedded the concept of Self-Organized Criticality (SOC) in deterministic Cellular Automata (CA) models in an attempt to simulate the emergence of flaring and sub-flaring activity in solar active regions. SOC CA models reproduce reasonably well several aspects of the statistical properties of flares and, moreover, they allow predictions regarding the respective properties of the unresolved nanoflares. We compare the above-mentioned predictions with observed arcsecond and sub-arcsecond activity on the low-chromosphere, in a newly formed active region. The source of the observations is the Flare Genesis Experiment (FGE) which has provided us with high-resolution maps of the magnetic field and the velocity field vectors on the photospheric boundary, as well as Hα filtergrams on the low-chromosphere. Moreover, UV and EUV data from TRACE are used for determining the activity on the overlying atmospheric layers. We present preliminary results on the statistical properties of transient Hα brightenings (Ellerman Bombs) which correlate well with significant overlying UV emission. Implications of these results, as well as potential directions for modeling the low-lying activity in the solar atmosphere are discussed. This work was sponsored by NASA grant NAG5-8331 and NSF grant OPP-9909162

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