Properties of Magnetic Neutral Line Gradients and Formation of Filaments
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We investigate the gradients of magnetic fields across neutral lines (NLs) and compare their properties for NLs with and without chromospheric filaments. Our results show that there is a range of preferred magnetic field gradients where the filament formation is enhanced. On the other hand, a horizontal gradient of the magnetic field across an NL alone does not appear to be a single factor that determines if a filament will form (or not) in a given location.
KeywordsMagnetic fields Filaments Prominences
The authors acknowledge funding from NASA’s NNH09AL04I interagency transfer and NSF grant AGS-0837915. This work utilizes SOLIS data obtained by the NSO Integrated Synoptic Program (NISP), managed by the National Solar Observatory (NSO), which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under a cooperative agreement with the National Science Foundation. SOHO is a project of international cooperation between ESA and NASA. The NSO is operated by AURA, under cooperative agreement with the National Science Foundation (NSF).
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