Impulsive eruptive flare on 23 October, 2003, from NOAA AR10484

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

Mysore

Congreso; 39th COSPAR General Assembly; 2012

COSPAR

We present and discuss the multi-wavelength observations of an M2.4 are that occurred in active region NOAA 10484 on 23 October, 2003. The are was well observed by ARIES H Solar Tower Telescope, TRACE, SOHO, and RHESSI instruments. The are was very impulsive and eruptive in nature, accompanied by a narrow coronal mass ejection (CME). H and TRACE observations show initially dark mass ejected in the east direction; this was followed by bright are material owing in the same direction. SOHO/EIT observations indicate that the coronal eld 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 are location. SOHO/MDI data show that new minor polarities are emerging at the east of AR 10484, where the are and CME occurred. The ow 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 are onset. A local linear force-free model of AR 10484 indicates that the AR magnetic eld structure at this location is formed by large-scale and very extended loops. This is conrmed by a global potential eld source surface (PFSS) model centered in the AR. The interaction of these MMFs with the new emerging ux at the east could have been at the origin of the are and CME.