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May 1998 “Pre-Event” Session Recap

May 1998 “Pre-Event” Session Recap. GOAL: compare estimates of magnetic free energy in AR 8210, to improve our understanding of coronal energy release. Coronal energy loss estimate during magnetogram interval: <~1e+31 erg. Lessons Learned.

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May 1998 “Pre-Event” Session Recap

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  1. May 1998 “Pre-Event” Session Recap GOAL: compare estimates of magnetic free energy in AR 8210, to improve our understanding of coronal energy release. Coronal energy loss estimate during magnetogram interval: <~1e+31 erg

  2. Lessons Learned • We distinguished between free magnetic energy, and “usable” free magnetic energy. • Through reconnection, flares probably dissipate current sheets, not volume currents. So the “free energy” stored in volume currents isn’t “usable.” (CMEs might differ in this regard?) • MCC claims to estimate only current sheet energies, while NLFFF / Virial include volume currents. • Hence, MCC = lower bound, & NLFFF/Virial = upper bound? Our coronal energy loss estimates fell between these two.

  3. Lessons Learned, cont’d: • Many versions of “the” potential field matching a given Bn exist, and can differ substantially in energy. • Some standardization would be desirable. • The relationship between free magnetic energy & coronal emission is not obvious. • It’s not clear that a measured increase in free energy should result in subsequent energy release immediately.

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