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

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

Córdoba

Congreso; 57 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 HalphaSolar Tower Telescope, TRACE, SOHO, and RHESSI instruments. The flare was very impulsive and eruptive in nature, accompanied by a narrow coronal mass ejection (CME). Halpha and TRACE observations show that initially the jet is ejected in the east direction. We observe X-ray compact sources at the flare location. These 50-100 keV sources coincide with TRACE bright kernels and may indicate the locations of the footpoints of reconnected loops. The flare site is a region of mixed field sign, where emergence of new polarities together with moving magnetic features (MMFs), are seen o the east of a large decaying sunspot. A local linear force-free model of AR 10484 indicates that the AR magnetic field structure consists of largescale, very extended loops and very small-scale loops, related to the new emerging flux and MMFs. These define a topological structure with two bald-patches (BPs) located at the flare site. The large-scale field lines, associated to the BPs, could represent open loops. This is confirmed by a global potential field source surface (PFSS) model, which shows that field lines rooted at the east of the AR reach the SS at 2.5 R. We propose that magnetic reconnection, ocurring at chromospheric level in the BP separatrices, may drive the flare and accompayining jet plasma expulsion, which later expands to give the narrow CME at the eastern solar limb.