Impulsive Eruptive Flare on 23 October, 2003, from NOAA AR 10484

CRISTIANI G.; MANDRINI C.H.; NUEVO F.A.; CHANDRA R.; JOSHI B.; SCHMIEDER B.; UDDIN W.

Córdoba

Congreso; 57ma Reunión Anual de la Asociación Argentina de Astronomía; 2014

Asociación Argentina de Astronomía

We present and discuss the multi-wavelength observations of an M2.4 flare that occurred in active region NOAA 10484 on 23 October, 2003. The flare was well observed by ARIES H$\alpha$ Solar Tower Telescope, TRACE, SOHO, and RHESSI instruments. The flare was very impulsive and eruptive in nature, accompanied by a narrow coronal mass ejection (CME). H$\alpha$ and TRACE observations show initially dark mass ejected in the east direction; this was followed by bright flare material flowing in the same direction. SOHO/EIT observations indicate that the coronal field structure can be opened towards the east. A coronal hole is observed at the north of the AR and nearby active regions are seen at its south. We observe a RHESSI X-ray compact source at the flare location. SOHO/MDI data show that new minor polarities are emerging at the east of AR 10841, where the flare and CME occurred. The flow pattern around the polarities shows positive twist in the active region. Strong moving magnetic feature (MMF) activity is seen surrounding the very intense negative spot at the east before flare onset. A local linear force-free model of AR 10841 indicates that the AR magnetic field structure at this location is formed by large-scale and very extended loops. This is confirmed by a global potential field source surface (PFSS) model centered in the AR. The interaction of these MMFs with the new emerging flux at the east could have been at the origin of the flare and CME.