Abstract
Force-free magnetic field extrapolation for region McMath 12417 on 4 July 1973 corroborates a suggestion by Roy and Michalitsanos (1974): A large moving magnetic feature presses together opposite fluxes to form an X-type neutral sheet; the supposed geometry of the field as derived from chromospheric activity (subflares, ejections) is confirmed by the calculated lines of force.
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Seehafer, N., Staude, J. Evidence for an X-type neutral sheet producing chromospheric activity. Sol Phys 67, 121–125 (1980). https://doi.org/10.1007/BF00146688
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DOI: https://doi.org/10.1007/BF00146688