%0 Journal Article %A Palacios Hernández, Judith %A Cid Tortuero, Consuelo %A Guerrero Ortega, Antonio %A Saiz Villanueva, María Elena %A Cerrato Montalbán, Yolanda %T Supergranular-scale magnetic flux emergence beneath an unstable filament %D 2015 %@ 0004-6361 %U http://hdl.handle.net/10017/29343 %X Here we report evidence of a large solar filament eruption on 2013, September 29. This smooth eruption, which passed without any previous flare, formed after a two-ribbon flare and a coronal mass ejection towards Earth. The coronal mass ejection generated a moderate geomagnetic storm on 2013, October 2 with very serious localized effects. The whole event passed unnoticed to flarewarning systems. %K Sun %K Filaments %K Magnetic fiels %K Image processing %K Fisica %K Physics %K Astronomía %K Astronomy %~ Biblioteca Universidad de Alcala