Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21610901w&link_type=abstract
American Astronomical Society, AAS Meeting #216, #109.01; Bulletin of the American Astronomical Society, Vol. 41, p.884
Astronomy and Astrophysics
Astronomy
Scientific paper
Essentially all solar activity --- variations in the Sun's energetic output in the form of radiation, particles, and fields --- can be traced to the evolution of solar magnetic fields. Beyond the significant ramifications solar activity has for our society, its many facets are of great scientific interest. The magnetic fields that drive solar activity are generated within the Sun's interior, and can extend through the photosphere into the corona, coupling the Sun's interior with its outer atmosphere. Hence, measurements of magnetic fields at the photosphere can provide insights into magnetic evolution both in the interior and the outer atmosphere. While maps of the photospheric magnetic field --- magnetograms --- have been produced routinely for decades, the cadence and quality of such measurements has improved dramatically in recent years, providing new insights into many aspects of the Sun's rich magnetic variability. I will present recent studies undertaken by myself and collaborators that use magnetograms to understand magnetic evolution over spatial scales ranging from granules to active regions, with implications for several aspects of solar activity, including dynamo processes on small and large scales, and impulsive events such as flares and CMEs.
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