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Kanya Kusano   Submitted: 2003-05-13 00:10

Although magnetic reconnection is believed as a key process of solar flares, the onset mechanism of flares remains as a long-standing problem. In this paper, we propose a new model that solar flares can be triggered by magnetic reconnection to convert the oppositely-sheared field into the shear-free field. This process can be understood as the annihilation between magnetic helicities of the different signs, and is consistent with the recent results of the helicity observations. Numerical simulation was carried out to examine the model, and it indicates that, if the helicity is sharply reversed within a magnetic arcade, reconnection quickly grows at the helicity inversion layer, driving the explosive dynamics. The explosive process appears as a result of the nonlinear instability, which can grow faster than exponential function of time. These results well support the annihilation-of-helicity model as the flare onset mechanism. Based on the results, we predict that the coexistence of the positive and negative helicity is crucial for the onset of flares.

Authors: K.Kusano, T.Yokoyama, T.Maeshiro, T.Sakurai
Projects: None

Publication Status: COSPAR, Adv. Space Research, in press
Last Modified: 2003-05-13 00:10
Go to main E-Print page  Chirality of Chromospheric Filaments  MEASUREMENT OF MAGNETIC HELICITY FLUX INTO THE SOLAR CORONA  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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