Measuring the Magnetic Free Energy Available for Solar Flares

Details Measuring the Magnetic Free Energy Available for Solar Flares Measuring the Magnetic Free Energy Available for Solar Flares

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.0903m&link_type=abstract

American Astronomical Society, SPD meeting #37, #9.03; Bulletin of the American Astronomical Society, Vol. 38, p.236

Astronomy and Astrophysics

Astronomy

Scientific paper

In this poster we report on recent progress in the effort to measurethe magnetic energy available to power solar flares. To directlymeasure the free magnetic energy using the virial theorem, themagnetic field must be known at an atmospheric height where it isforce-free, i.e. J x B = 0. In Metcalf, Leka & Mickey (2005) the freeenergy of AR 10486 was determined just prior to the X10 flare at20:39UT on 29 October 2003, using vector magnetic field measurementsobtained in the solar chromosphere where the field is force-free. Theresults from this study are expanded here to a wider investigation ofthe magnetic energy storage in flare- and CME-producing activeregions. With appropriate effort and instrumentation, directlymeasuring the free energy and its evolution may provide a powerfulflare-prediction capability. This research was funded by NASAcontract NAG5-12466 and AFOSR contract F49620-03-C-0019.

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