Source region of the 2003 November 18 CME that led to the strongest magnetic storm of cycle 23

TL;DR

This study investigates the magnetic and energetic conditions in NOAA AR 10501 that led to the November 2003 CME, which caused the strongest geomagnetic storm of cycle 23, by analyzing magnetograms and chromospheric images.

Contribution

It provides a detailed analysis of the magnetic field evolution and energy release processes in the source active region prior to the CME, linking magnetic gradients to flare occurrence.

Findings

High magnetic field gradient regions are associated with flare sites.

Magnetic flux and energy variations precede the CME event.

Flare location correlates with regions of high magnetic energy.

Abstract

The super-storm of November 20, 2003 was associated with a high speed coronal mass ejection which originated in the NOAA AR 10501 on November 18. This coronal mass ejection had severe terrestrial consequences leading to a geomagnetic storm with DST index of -472 nT, the strongest of the current solar cycle. In this paper, we attempt to understand the factors that led to the coronal mass ejection on November 18. We have also studied the evolution of the photospheric magnetic field of NOAA AR 10501, the source region of this coronal mass ejection. For this purpose, the MDI line-of-sight magnetograms and vector magnetograms from Solar Flare Telescope, Mitaka, obtained during November, 17-19, 2003 were analysed. In particular, quantitative estimates of the temporal variation in magnetic flux, energy and magnetic field gradient were estimated for the source active region. The evolution of these quantities was studied for the 3-day period with an objective to understand the pre-flare configuration leading up to the moderate flare which was associated with the geo-effective coronal mass ejection. We also examined the chromospheric images recorded in H-alpha from Udaipur Solar Observatory to compare the flare location with regions of different magnetic field and energy. Our observations provide evidence that the flare associated with the CME occurred at a location marked by high magnetic field gradient which led to release of free energy stored in the active region.