Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.2003g&link_type=abstract
American Astronomical Society, SPD meeting #37, #20.03; Bulletin of the American Astronomical Society, Vol. 38, p.248
Astronomy and Astrophysics
Astronomy
Scientific paper
Every intense magnetic flux accumulation in the Sun, known as activeregion (AR), engages into small-scale energy release activitiesmanifesting themselves as sub-flares. Of the several thousands of ARsthat emerge, evolve, and disappear within a typical solar cycle,however, only a tiny percentage will ever trigger one or more majorflares (X- or M-class). These flares are most commonly related tofurther eruptive activity, such as coronal mass ejections (CMEs).Identifying eruptive ARs while in their pre-eruption phases will bethe subject of this presentation. With little doubt existing over themagnetic origin of solar eruptions, I will highlight possible areas offuture research in AR magnetic fields. The timing of magnetic fieldstudies is excellent in view of the anticipated wealth of vectormagnetogram data from SOLIS, Solar-B, and the SDO. While our goal ispractical, namely the quantitative assessment of the eruptivepotential of ARs, the recommended tactic entails fundamental physicalproperties of AR magnetic fields such as their three-dimensionalstructure, energy budgets, and complexity, reflected on theirhelical properties. The elusive role of magnetic helicity in solareruptions and our limitations in assessing it will be particularlyemphasized.
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