Abstract
On 5 January 2005, SoHO/LASCO observed the launch of two successive coronal mass ejections (CMEs) associated with the filament (active region and quiescent) structures. The eruptions resulted in two distinct magnetic clouds whose embedded flux‐rope topology is modeled by the Grad‐Shafranov (G‐S) reconstruction technique. Filament plasma remnants in these magnetic clouds were identified using a combination of in situ plasma, magnetic, and composition signatures. In situ spacecraft (ACE and Wind) measurements suggest interaction between two magnetic clouds with complex magnetic structures at interface region separated by magnetic holes. These features impacted the Earth's terrestrial magnetosphere‐ionosphere system and resulted in a moderate geomagnetic storm (peak Dst ≈−96 nT). During the main phase of this storm on 7 January 2005, polarity reversals in the Y component (dawn to dusk) of interplanetary electric field triggered two major auroral substorms with concomitant changes in the polar ionospheric electric field. However, similar polarity reversal on 8 January 2005 during the recovery phase of the storm did not trigger any auroral substorm activity. The results provide clues for the interplanetary interaction of the two CMEs and its possible role in the development of the geomagnetic storm and substorms.
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call