Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3212s09g&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 12, CiteID L12S09
Astronomy and Astrophysics
Astrophysics
38
Interplanetary Physics: Ejecta, Driver Gases, And Magnetic Clouds, Interplanetary Physics: Interplanetary Shocks, Interplanetary Physics: Solar Wind Plasma, Magnetospheric Physics: Magnetic Storms And Substorms (7954), Solar Physics, Astrophysics, And Astronomy: Coronal Mass Ejections (2101)
Scientific paper
The largest geomagnetic storm of solar cycle 23 occurred on 2003 November 20 with a Dst index of -472 nT, due to a coronal mass ejection (CME) from active region 0501. The CME near the Sun had a sky-plane speed of ~1660 km/s, but the associated magnetic cloud (MC) arrived with a speed of only 730 km/s. The MC at 1 AU (ACE Observations) had a high magnetic field (~56 nT) and high inclination to the ecliptic plane. The southward component of the MC's magnetic field was made up almost entirely of its axial field because of its east-south-west (ESW) chirality. We suggest that the southward pointing strong axial field of the MC reconnected with Earth's front-side magnetic field, resulting in the largest storm of the solar cycle 23.
Gopalswamy Nat
Howard Russ A.
Lepping Ronald P.
Michalek Gregory
Xie Hehu
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